San Diego, California

Regional Weather Alerts


     

Alert: Heat Advisory
Area(s): Coalinga - Avenal; West Side of Fresno and Kings Counties; Caruthers - San Joaquin - Selma; Fresno-Clovis; West Side Mountains South of 198; Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter; Hanford - Corcoran - Lemoore; Visalia - Porterville - Reedley; Buena Vista; Bakersfield; Southeast San Joaquin Valley; South End San Joaquin Valley
Effective: 2026-08-23 @ 6:36 pm -> 2026-08-24 @ 4:00 am
Onset: 2026-08-24 @ 7:00 am -> 2026-08-27 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Hanford CA on 2026-08-23 @ 6:36 pm
Headline: Heat Advisory issued August 23 at 4:36PM PDT until August 26 at 11:00PM PDT by NWS Hanford CA
Description: * WHAT...High temperatures up to 104 expected.

* WHERE...Southern San Joaquin Valley and West Side Hills of the
Coastal Range.

* WHEN...From 5 AM Monday to 11 PM PDT Wednesday.

* IMPACTS...Hot temperatures may cause heat illnesses.

Alert: Extreme Heat Warning
Area(s): Indian Wells Valley; Mojave Desert Slopes; Mojave Desert
Effective: 2026-08-23 @ 6:36 pm -> 2026-08-24 @ 4:00 am
Onset: 2026-08-24 @ 7:00 am -> 2026-08-27 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Hanford CA on 2026-08-23 @ 6:36 pm
Headline: Extreme Heat Warning issued August 23 at 4:36PM PDT until August 26 at 11:00PM PDT by NWS Hanford CA
Description: * WHAT...Dangerously hot conditions with high temperatures up to 108
expected. Morning low temperatures between 75 and 80 degrees will
provide little relief at night.

* WHERE...Indian Wells Valley, Mojave Desert, and Mojave Desert
Slopes.

* WHEN...From 5 AM Monday to 11 PM PDT Wednesday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

Alert: Extreme Heat Watch
Area(s): Apple and Lucerne Valleys
Effective: 2026-08-23 @ 3:54 pm -> 2026-08-24 @ 12:30 am
Onset: 2026-08-25 @ 12:00 pm -> 2026-08-28 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS San Diego CA on 2026-08-23 @ 3:54 pm
Headline: Extreme Heat Watch issued August 23 at 1:54PM PDT until August 28 at 8:00PM PDT by NWS San Diego CA
Description: * WHAT...Dangerously hot conditions with temperatures up to 108
possible and limited nighttime cooling.

* WHERE...Apple and Lucerne Valleys.

* WHEN...From Tuesday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

Alert: Heat Advisory
Area(s): San Bernardino County Mountains
Effective: 2026-08-23 @ 3:54 pm -> 2026-08-24 @ 12:30 am
Onset: 2026-08-23 @ 3:54 pm -> 2026-08-25 @ 12:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS San Diego CA on 2026-08-23 @ 3:54 pm
Headline: Heat Advisory issued August 23 at 1:54PM PDT until August 25 at 10:00AM PDT by NWS San Diego CA
Description: * WHAT...Temperatures in the mid to upper 90s below 5000 ft MSL.

* WHERE...San Bernardino County Mountains.

* WHEN...For the Heat Advisory, until 10 AM PDT Tuesday. For the
Extreme Heat Watch, from Tuesday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.

Alert: Heat Advisory
Area(s): San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; Orange County Inland
Effective: 2026-08-23 @ 3:54 pm -> 2026-08-24 @ 12:30 am
Onset: 2026-08-23 @ 3:54 pm -> 2026-08-25 @ 12:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS San Diego CA on 2026-08-23 @ 3:54 pm
Headline: Heat Advisory issued August 23 at 1:54PM PDT until August 25 at 10:00AM PDT by NWS San Diego CA
Description: * WHAT...Temperatures 90 to 98 for Inland Orange County, 90 to 102
for the San Diego County Valleys, 100 to 106 for the Inland Empire
and 89 to 100 in the mountains. Temperatures increase slightly for
the middle and end of next week, making for a prolonged and
dangerous stretch of heat.

* WHERE...Orange County Inland Areas, Riverside County Mountains,
San Bernardino and Riverside County Valleys-The Inland Empire, San
Diego County Mountains, San Diego County Valleys, and Santa Ana
Mountains and Foothills.

* WHEN...For the Heat Advisory, until 10 AM PDT Tuesday. For the
Extreme Heat Watch, from Tuesday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.

* ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal
will limit relief from the heat. Increasing temperatures into the
middle of next week will increase the threat of heat-related
illness across populations.

Alert: Extreme Heat Watch
Area(s): San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; Orange County Inland
Effective: 2026-08-23 @ 3:54 pm -> 2026-08-24 @ 12:30 am
Onset: 2026-08-25 @ 12:00 pm -> 2026-08-28 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS San Diego CA on 2026-08-23 @ 3:54 pm
Headline: Extreme Heat Watch issued August 23 at 1:54PM PDT until August 28 at 8:00PM PDT by NWS San Diego CA
Description: * WHAT...Temperatures 90 to 98 for Inland Orange County, 90 to 102
for the San Diego County Valleys, 100 to 106 for the Inland Empire
and 89 to 100 in the mountains. Temperatures increase slightly for
the middle and end of next week, making for a prolonged and
dangerous stretch of heat.

* WHERE...Orange County Inland Areas, Riverside County Mountains,
San Bernardino and Riverside County Valleys-The Inland Empire, San
Diego County Mountains, San Diego County Valleys, and Santa Ana
Mountains and Foothills.

* WHEN...For the Heat Advisory, until 10 AM PDT Tuesday. For the
Extreme Heat Watch, from Tuesday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.

* ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal
will limit relief from the heat. Increasing temperatures into the
middle of next week will increase the threat of heat-related
illness across populations.

Alert: Extreme Heat Watch
Area(s): San Bernardino County Mountains
Effective: 2026-08-23 @ 3:54 pm -> 2026-08-24 @ 12:30 am
Onset: 2026-08-25 @ 12:00 pm -> 2026-08-28 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS San Diego CA on 2026-08-23 @ 3:54 pm
Headline: Extreme Heat Watch issued August 23 at 1:54PM PDT until August 28 at 8:00PM PDT by NWS San Diego CA
Description: * WHAT...Temperatures in the mid to upper 90s below 5000 ft MSL.

* WHERE...San Bernardino County Mountains.

* WHEN...For the Heat Advisory, until 10 AM PDT Tuesday. For the
Extreme Heat Watch, from Tuesday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.

Alert: Extreme Heat Warning
Area(s): Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: 2026-08-23 @ 3:54 pm -> 2026-08-24 @ 12:30 am
Onset: 2026-08-23 @ 3:54 pm -> 2026-08-28 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS San Diego CA on 2026-08-23 @ 3:54 pm
Headline: Extreme Heat Warning issued August 23 at 1:54PM PDT until August 28 at 8:00PM PDT by NWS San Diego CA
Description: * WHAT...Dangerously hot conditions with temperatures up to 113.

* WHERE...Coachella Valley, San Diego County Deserts, and San
Gorgonio Pass near Banning.

* WHEN...Until 8 PM PDT Friday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

* ADDITIONAL DETAILS...Overnight temperatures 5 to 8 degrees above
normal will limit relief from the heat.

Alert: Extreme Heat Watch
Area(s): San Diego County Coastal Areas; Orange County Coastal
Effective: 2026-08-23 @ 3:54 pm -> 2026-08-24 @ 12:30 am
Onset: 2026-08-25 @ 12:00 pm -> 2026-08-28 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS San Diego CA on 2026-08-23 @ 3:54 pm
Headline: Extreme Heat Watch issued August 23 at 1:54PM PDT until August 28 at 8:00PM PDT by NWS San Diego CA
Description: * WHAT...Dangerously hot conditions with temperatures up to 95
possible.

* WHERE...Orange County Coastal Areas and San Diego County Coastal
Areas.

* WHEN...From Tuesday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

* ADDITIONAL DETAILS...Overnight lows around 5 to 7 degrees above
normal will limit relief from the heat, especially for those
without adequate cooling.

Alert: Red Flag Warning
Area(s): Western Klamath National Forest; Central Siskiyou County Including Shasta Valley; Siskiyou Mountains; Eastern Rogue Valley; Southern Oregon Cascades
Effective: 2026-08-23 @ 1:59 pm -> 2026-08-24 @ 7:00 am
Onset: 2026-08-24 @ 1:00 pm -> 2026-08-24 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Medford OR on 2026-08-23 @ 1:59 pm
Headline: Red Flag Warning issued August 23 at 11:59AM PDT until August 24 at 8:00PM PDT by NWS Medford OR
Description: The National Weather Service in Medford has issued a Red Flag
Warning, which is in effect from 11 AM to 8 PM PDT Monday.

* IMPACTS...Any fires that develop will likely spread rapidly.

* AFFECTED AREA...In California, Fire Weather Zones 280 and 281.
In Oregon...Fire Weather Zones 621, 622, and 623. In California,
this includes Scott Valley, Shasta Valley, and the Klamath River
Valley. In Oregon, this includes the Siskiyou Mountains, the
Southern Cascade Mountains, and the Rogue Valley.

* WIND...In Oregon, west to northwest winds 10 to 15 mph with
gusts around 25 mph. In California, south to southwest winds 10
to 20 mph with gusts around 30 mph.

* HUMIDITY...Daytime humidities down to 8 to 15 percent.

* DETAILED URL...View the hazard area in detail at
https://weather.gov/wrh/hazards?wfo=mfr

Alert: Extreme Heat Warning
Area(s): Parker Valley; Kofa; Yuma; Central La Paz; Southeast Yuma County; Gila River Valley; Imperial County Southwest; Imperial County Southeast; Imperial County West; Imperial Valley; Palo Verde Valley; Chuckwalla Valley
Effective: 2026-08-23 @ 12:23 pm -> 2026-08-24 @ 5:00 am
Onset: 2026-08-23 @ 12:23 pm -> 2026-08-29 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Phoenix AZ on 2026-08-23 @ 12:23 pm
Headline: Extreme Heat Warning issued August 23 at 10:23AM MST until August 29 at 8:00PM MST by NWS Phoenix AZ
Description: * WHAT...Dangerously hot and humid conditions. Afternoon temperatures
106 to 118 expected. Major to Extreme Heat Risk.

* WHERE...Portions of southwest Arizona and southeast California.

* WHEN...Until 8 PM MST /8 PM PDT/ Saturday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Overexposure can cause heat cramps and heat
exhaustion to develop and, without intervention, can lead to heat
stroke.

Alert: Extreme Heat Warning
Area(s): Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Northwest Deserts; Death Valley National Park; San Bernardino County-Upper Colorado River Valley; Las Vegas Valley; Lake Mead - NV side; Lake Mohave - NV side
Effective: 2026-08-23 @ 3:44 am -> 2026-08-23 @ 10:00 pm
Onset: 2026-08-23 @ 3:44 am -> 2026-08-23 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Las Vegas NV on 2026-08-23 @ 3:44 am
Headline: Extreme Heat Warning issued August 23 at 1:44AM PDT until August 23 at 8:00PM PDT by NWS Las Vegas NV
Description: * WHAT...Dangerously hot conditions with temperatures up to 115 to
118 degrees expected through Death Valley and the lower Colorado
River Valley, with highs between 107 to 110 degrees elsewhere. Near
record warm low temperatures expected in urban areas.

* WHERE...Lake Mohave, Lake Mead, Lower Colorado River Valley / Lake
Havasu, Northwest Deserts, Death Valley National Park, and Las
Vegas Valley.

* WHEN...Until 8 PM PDT /8 PM MST/ this evening.

* IMPACTS...Heat-related illnesses increase significantly during
extreme heat events.

Alert: Heat Advisory
Area(s): Santa Clarita Valley; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains; Southern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley
Effective: 2026-08-23 @ 2:06 am -> 2026-08-25 @ 12:00 pm
Onset: 2026-08-23 @ 12:00 pm -> 2026-08-25 @ 12:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Los Angeles/Oxnard CA on 2026-08-23 @ 2:06 am
Headline: Heat Advisory issued August 23 at 12:06AM PDT until August 25 at 10:00AM PDT by NWS Los Angeles/Oxnard CA
Description: * WHAT...For the Heat Advisory, temperatures up to 107 expected. For
the Extreme Heat Watch, dangerously hot conditions with
temperatures up to 112 possible.

* WHERE...A portion of southwest California.

* WHEN...For the Heat Advisory, from 10 AM this morning to 10 AM PDT
Tuesday. For the Extreme Heat Watch, from Tuesday morning through
Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

Alert: Heat Advisory
Area(s): Cuyama Valley
Effective: 2026-08-23 @ 2:06 am -> 2026-08-25 @ 12:00 pm
Onset: 2026-08-23 @ 12:00 pm -> 2026-08-25 @ 12:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Los Angeles/Oxnard CA on 2026-08-23 @ 2:06 am
Headline: Heat Advisory issued August 23 at 12:06AM PDT until August 25 at 10:00AM PDT by NWS Los Angeles/Oxnard CA
Description: * WHAT...For the Heat Advisory, temperatures up to 99 expected. For
the Extreme Heat Watch, dangerously hot conditions with
temperatures up to 104 possible.

* WHERE...Cuyama Valley.

* WHEN...For the Heat Advisory, from 10 AM this morning to 10 AM PDT
Tuesday. For the Extreme Heat Watch, from Tuesday morning through
Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.

Alert: Heat Advisory
Area(s): Catalina and Santa Barbara Islands; Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Ventura County Beaches; Ventura County Inland Coast; Malibu Coast; Los Angeles County Beaches; Palos Verdes Hills; Los Angeles County Inland Coast including Downtown Los Angeles
Effective: 2026-08-23 @ 2:06 am -> 2026-08-25 @ 12:00 pm
Onset: 2026-08-23 @ 12:00 pm -> 2026-08-25 @ 12:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Los Angeles/Oxnard CA on 2026-08-23 @ 2:06 am
Headline: Heat Advisory issued August 23 at 12:06AM PDT until August 25 at 10:00AM PDT by NWS Los Angeles/Oxnard CA
Description: * WHAT...For the Heat Advisory, temperatures up to 94 expected. For
the Extreme Heat Watch, dangerously hot conditions with
temperatures up to 100 possible.

* WHERE...Catalina and Santa Barbara Islands, Los Angeles County
Beaches, Los Angeles County Inland Coast including Downtown Los
Angeles, Malibu Coast, Palos Verdes Hills, Santa Barbara County
Southeastern Coast, Santa Barbara County Southwestern Coast,
Ventura County Beaches, and Ventura County Inland Coast.

* WHEN...For the Heat Advisory, from 10 AM this morning to 10 AM PDT
Tuesday. For the Extreme Heat Watch, from Tuesday morning through
Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.

Alert: Extreme Heat Watch
Area(s): Cuyama Valley
Effective: 2026-08-23 @ 2:06 am -> 2026-08-25 @ 12:00 pm
Onset: 2026-08-25 @ 12:00 pm -> 2026-08-28 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS Los Angeles/Oxnard CA on 2026-08-23 @ 2:06 am
Headline: Extreme Heat Watch issued August 23 at 12:06AM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
Description: * WHAT...For the Heat Advisory, temperatures up to 99 expected. For
the Extreme Heat Watch, dangerously hot conditions with
temperatures up to 104 possible.

* WHERE...Cuyama Valley.

* WHEN...For the Heat Advisory, from 10 AM this morning to 10 AM PDT
Tuesday. For the Extreme Heat Watch, from Tuesday morning through
Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.

Alert: Extreme Heat Watch
Area(s): Santa Clarita Valley; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains; Southern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley
Effective: 2026-08-23 @ 2:06 am -> 2026-08-25 @ 12:00 pm
Onset: 2026-08-25 @ 12:00 pm -> 2026-08-28 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS Los Angeles/Oxnard CA on 2026-08-23 @ 2:06 am
Headline: Extreme Heat Watch issued August 23 at 12:06AM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
Description: * WHAT...For the Heat Advisory, temperatures up to 107 expected. For
the Extreme Heat Watch, dangerously hot conditions with
temperatures up to 112 possible.

* WHERE...A portion of southwest California.

* WHEN...For the Heat Advisory, from 10 AM this morning to 10 AM PDT
Tuesday. For the Extreme Heat Watch, from Tuesday morning through
Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

Alert: Extreme Heat Watch
Area(s): Catalina and Santa Barbara Islands; Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Ventura County Beaches; Ventura County Inland Coast; Malibu Coast; Los Angeles County Beaches; Palos Verdes Hills; Los Angeles County Inland Coast including Downtown Los Angeles
Effective: 2026-08-23 @ 2:06 am -> 2026-08-25 @ 12:00 pm
Onset: 2026-08-25 @ 12:00 pm -> 2026-08-28 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS Los Angeles/Oxnard CA on 2026-08-23 @ 2:06 am
Headline: Extreme Heat Watch issued August 23 at 12:06AM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
Description: * WHAT...For the Heat Advisory, temperatures up to 94 expected. For
the Extreme Heat Watch, dangerously hot conditions with
temperatures up to 100 possible.

* WHERE...Catalina and Santa Barbara Islands, Los Angeles County
Beaches, Los Angeles County Inland Coast including Downtown Los
Angeles, Malibu Coast, Palos Verdes Hills, Santa Barbara County
Southeastern Coast, Santa Barbara County Southwestern Coast,
Ventura County Beaches, and Ventura County Inland Coast.

* WHEN...For the Heat Advisory, from 10 AM this morning to 10 AM PDT
Tuesday. For the Extreme Heat Watch, from Tuesday morning through
Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.

Alert: Extreme Heat Watch
Area(s): Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley
Effective: 2026-08-23 @ 2:06 am -> 2026-08-25 @ 12:00 pm
Onset: 2026-08-25 @ 12:00 pm -> 2026-08-28 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Future
Issued By: NWS Los Angeles/Oxnard CA on 2026-08-23 @ 2:06 am
Headline: Extreme Heat Watch issued August 23 at 12:06AM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
Description: * WHAT...Dangerously hot conditions with temperatures up to 112
possible.

* WHERE...Antelope Valley, Eastern Antelope Valley Foothills, and
Western Antelope Valley Foothills.

* WHEN...From Tuesday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.