WWUS76 KSGX 240854 NPWSGX URGENT - WEATHER MESSAGE National Weather Service San Diego CA 154 AM PDT Mon Aug 24 2026 CAZ048-242230- /O.EXB.KSGX.XH.W.0008.260825T1700Z-260829T0300Z/ /O.EXA.KSGX.HT.Y.0010.000000T0000Z-260825T1700Z/ San Bernardino and Riverside County Valleys-The Inland Empire- Including the cities of Rancho Cucamonga, Moreno Valley, San Bernardino, Corona, Fontana, Riverside, and Ontario 154 AM PDT Mon Aug 24 2026 ...HEAT ADVISORY IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WARNING IN EFFECT FROM 10 AM TUESDAY TO 8 PM PDT FRIDAY... * WHAT...For the Heat Advisory, temperatures up to 106. For the Extreme Heat Warning, dangerously hot conditions with temperatures up to 110 expected. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...For the Heat Advisory, until 10 AM PDT Tuesday. For the Extreme Heat Warning, from 10 AM Tuesday to 8 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Hot temperatures may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ CAZ050-242230- /O.EXB.KSGX.XH.W.0008.260825T1700Z-260829T0300Z/ /O.EXA.KSGX.HT.Y.0010.000000T0000Z-260825T1700Z/ San Diego County Valleys- Including the cities of San Marcos, La Mesa, El Cajon, Santee, Poway, and Escondido 154 AM PDT Mon Aug 24 2026 ...HEAT ADVISORY IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WARNING IN EFFECT FROM 10 AM TUESDAY TO 8 PM PDT FRIDAY... * WHAT...For the Heat Advisory, high temperatures in the 90s in the western valleys to around 105 in the far inland valleys. For the Extreme Heat Warning, dangerously hot conditions with high temperatures in he upper 90s to 109 expected. * WHERE...San Diego County Valleys. * WHEN...For the Heat Advisory, until 10 AM PDT Tuesday. For the Extreme Heat Warning, from 10 AM Tuesday to 8 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Hot temperatures may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ CAZ057-242230- /O.EXB.KSGX.XH.W.0008.260825T1700Z-260829T0300Z/ /O.EXA.KSGX.HT.Y.0010.000000T0000Z-260825T1700Z/ Santa Ana Mountains and Foothills- 154 AM PDT Mon Aug 24 2026 ...HEAT ADVISORY IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WARNING IN EFFECT FROM 10 AM TUESDAY TO 8 PM PDT FRIDAY... * WHAT...For the Heat Advisory, high temperatures in the 90s expected. For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the mid 90s to 105 expected. * WHERE...Santa Ana Mountains and Foothills. * WHEN...For the Heat Advisory, until 10 AM PDT Tuesday. For the Extreme Heat Warning, from 10 AM Tuesday to 8 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Hot temperatures may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ CAZ058-242230- /O.EXB.KSGX.XH.W.0008.260825T1700Z-260829T0300Z/ /O.EXA.KSGX.HT.Y.0010.000000T0000Z-260825T1700Z/ San Diego County Mountains- Including the cities of Julian and Pine Valley 154 AM PDT Mon Aug 24 2026 ...HEAT ADVISORY IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WARNING IN EFFECT FROM 10 AM TUESDAY TO 8 PM PDT FRIDAY... * WHAT...For the Heat Advisory, high temperatures in the 90s expected. For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the mid 90s to 104 expected. * WHERE...San Diego County Mountains. * WHEN...For the Heat Advisory, until 10 AM PDT Tuesday. For the Extreme Heat Warning, from 10 AM Tuesday to 8 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Hot temperatures may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ CAZ554-242230- /O.EXB.KSGX.XH.W.0008.260825T1700Z-260829T0300Z/ /O.EXA.KSGX.HT.Y.0010.000000T0000Z-260825T1700Z/ Orange County Inland Areas- Including the cities of Orange, Irvine, Anaheim, Santa Ana, Fullerton, Garden Grove, and Mission Viejo 154 AM PDT Mon Aug 24 2026 ...HEAT ADVISORY IN EFFECT UNTIL 10 AM PDT TUESDAY... ...EXTREME HEAT WARNING IN EFFECT FROM 10 AM TUESDAY TO 8 PM PDT FRIDAY... * WHAT...For the Heat Advisory, high temperatures in the 90s expected. For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the mid 90s to 104 expected. * WHERE...Orange County Inland Areas. * WHEN...For the Heat Advisory, until 10 AM PDT Tuesday. For the Extreme Heat Warning, from 10 AM Tuesday to 8 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Hot temperatures may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ CAZ061-062-065-242230- /O.CON.KSGX.XH.W.0008.000000T0000Z-260829T0300Z/ Coachella Valley-San Diego County Deserts-San Gorgonio Pass near Banning- Including the cities of Indio, Palm Desert, Coachella, Palm Desert Country, Cathedral City, Borrego Springs, La Quinta, and Palm Springs 154 AM PDT Mon Aug 24 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY... * WHAT...Dangerously hot conditions with high temperatures of 110 to 116 expected. * WHERE...Coachella Valley, San Diego County Deserts, and San Gorgonio Pass near Banning. * WHEN...Until 8 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ CAZ056-242230- /O.EXB.KSGX.HT.Y.0010.000000T0000Z-260829T0300Z/ Riverside County Mountains- Including the cities of Idyllwild-Pine Cove 154 AM PDT Mon Aug 24 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM PDT FRIDAY... * WHAT...High temperatures in the 90s to 102 expected. * WHERE...Riverside County Mountains. * WHEN...Until 8 PM PDT Friday. * IMPACTS...Hot temperatures may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ CAZ043-242230- /O.EXB.KSGX.HT.Y.0010.260825T1700Z-260829T0300Z/ San Diego County Coastal Areas- Including the cities of Encinitas, Chula Vista, Carlsbad, National City, Oceanside, Vista, and San Diego 154 AM PDT Mon Aug 24 2026 ...HEAT ADVISORY IN EFFECT FROM 10 AM TUESDAY TO 8 PM PDT FRIDAY... * WHAT...High temperatures in the mid 80s near the beaches to the lower to mid 90s for the mesas and other higher coastal terrain expected. * WHERE...San Diego County Coastal Areas. * WHEN...From 10 AM Tuesday to 8 PM PDT Friday. * IMPACTS...Hot temperatures may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ CAZ552-242230- /O.EXB.KSGX.HT.Y.0010.260825T1700Z-260829T0300Z/ Orange County Coastal Areas- Including the cities of Costa Mesa and Huntington Beach 154 AM PDT Mon Aug 24 2026 ...HEAT ADVISORY IN EFFECT FROM 10 AM TUESDAY TO 8 PM PDT FRIDAY... * WHAT...High temperatures in the mid 80s near the beaches to the lower to mid 90s for higher coastal terrain expected. * WHERE...Orange County Coastal Areas. * WHEN...From 10 AM Tuesday to 8 PM PDT Friday. * IMPACTS...Hot temperatures may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ CAZ055-242230- /O.EXT.KSGX.HT.Y.0010.000000T0000Z-260829T0300Z/ San Bernardino County Mountains- Including the cities of Crestline and Lake Arrowhead 154 AM PDT Mon Aug 24 2026 ...HEAT ADVISORY NOW IN EFFECT UNTIL 8 PM PDT FRIDAY... * WHAT...Temperatures up to 96. * WHERE...San Bernardino County Mountains. * WHEN...Until 8 PM PDT Friday. * IMPACTS...Hot temperatures may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ 17