Extreme heat alerts, nationwide
15 active, moderate and up. Open a state stream for county detail and subscriptions.
SevereExtreme heatCAends 2026-10-09
Extreme Heat Warning · Orange County Inland
Extreme Heat Warning issued October 3 at 9:40PM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
SevereExtreme heatCAends 2026-10-09
Extreme Heat Warning · Orange County Coastal
Extreme Heat Warning issued October 3 at 9:40PM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
SevereExtreme heatCAends 2026-10-09
Extreme Heat Warning · San Bernardino and Riverside County Valleys-The Inland Empire
Extreme Heat Warning issued October 3 at 9:40PM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
SevereExtreme heatCAends 2026-10-09
Extreme Heat Warning · San Diego County Coastal Areas
Extreme Heat Warning issued October 3 at 9:40PM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
SevereExtreme heatCAends 2026-10-09
Extreme Heat Warning · San Diego County Inland Valleys
Extreme Heat Warning issued October 3 at 9:40PM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
SevereExtreme heatCAends 2026-10-09
Extreme Heat Warning · Santa Ana Mountains and Foothills
Extreme Heat Warning issued October 3 at 9:40PM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
SevereExtreme heatCAends 2026-10-09
Extreme Heat Warning · Cuyama Valley; Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains; Santa Cruz and Anacapa Islands
Extreme Heat Warning issued October 3 at 12:15PM PDT until October 8 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
SevereExtreme heatCAends 2026-10-09
Extreme Heat Warning · Catalina and Santa Barbara Islands; Santa Clarita Valley; Ventura County Beaches; Ventura County Inland Coast; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Malibu Coast; Los Angeles County Beaches; Palos Verdes Hills; Los Angeles County Inland Coast including Downtown Los Angeles; 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; Los Angeles County San Gabriel Valley
Extreme Heat Warning issued October 3 at 12:15PM PDT until October 8 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
ModerateExtreme heatCAends 2026-10-08
Heat Advisory · Sonoma Coastal Range; North Bay Interior Mountains; North Bay Interior Valleys; San Francisco Bay Shoreline; East Bay Interior Valleys; Santa Cruz Mountains; Santa Clara Valley Including San Jose; Eastern Santa Clara Hills; East Bay Hills; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park
Heat Advisory issued October 3 at 7:48PM PDT until October 7 at 10:00PM PDT by NWS San Francisco CA
What to do
Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles. Car interiors will reach lethal temperatures in
ModerateExtreme heatCAends in 24 h
Heat Advisory · Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Southern Monterey Bay and Big Sur Coast
Heat Advisory issued October 3 at 7:48PM PDT until October 4 at 10:00PM PDT by NWS San Francisco CA
What to do
Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles. Car interiors will reach lethal temperatures in
ModerateExtreme heatCAends in 24 h
Heat Advisory · San Francisco; Marin Coastal Range; Northern Salinas Valley/Hollister Valley and Carmel Valley; Northern Monterey Bay
Heat Advisory issued October 3 at 7:48PM PDT until October 4 at 10:00PM PDT by NWS San Francisco CA
What to do
Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles. Car interiors will reach lethal temperatures in
ModerateExtreme heatCAends 2026-10-08
Heat Advisory · West Side Mountains north of 198; Los Banos - Dos Palos; Merced - Madera - Mendota; Planada - Le Grand - Snelling; 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; Mariposa Madera Foothills; Mariposa-Madera Lower Sierra; Fresno-Tulare Foothills; Fresno-Tulare Lower Sierra; South End Sierra Foothills; Sou
Heat Advisory issued October 3 at 5:34PM PDT until October 7 at 11:00PM PDT by NWS Hanford CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
ModerateExtreme heatCAends 2026-10-08
Heat Advisory · Western Shasta County Foothills Between 1000-3000 ft; South-Central Shasta County Including Redding Metro; Eastern Shasta County Foothills Between 1000-3000 ft; Sierra Nevada of Tehama-Butte-Plumas Counties Between 1000-3000 ft; Northern Motherlode Between 1000-3000 ft; Central Motherlode Between 1000-3000 ft; Southern Motherlode Between 1000-3000 ft; Western Tehama County Foothills Between 1000-3000 ft; Northern Sacramento Valley in Tehama County; Central Glenn County Including Interstate 5; Eastern Glenn County; Butte County Below 1000 ft; Western Glenn and Colusa County Foothills Between 10
Heat Advisory issued October 3 at 2:14PM PDT until October 7 at 10:00PM PDT by NWS Sacramento CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
ModerateExtreme heatCAends in 25 h
Heat Advisory · Southwestern Interior Mendocino; Southeastern Interior Mendocino; Western Lake; Southwestern Lake; Eastern Lake
Heat Advisory issued October 3 at 1:43PM PDT until October 4 at 11:00PM PDT by NWS Eureka CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
ModerateExtreme heatCAends 2026-10-08
Heat Advisory · San Luis Obispo County Inland Central Coast; Santa Lucia Mountains; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Barbara County Inland Central Coast; Santa Ynez Valley
Heat Advisory issued October 3 at 12:15PM PDT until October 7 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
What to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.