Heat Advisory issued September 7 at 11:09AM PDT until September 10 at 8:00PM PDT by NWS San Diego CA

Riverside County Mountains; San Diego County Mountains

Urgency: Expected

Certainty: Likely

Onset: 9/8/2026, 5:00:00 PM

Expires: 9/8/2026, 5:15:00 AM

Details

* WHAT...High temperatures in the upper 80s to low 90s expected and overnight lows in the 70s below 5000 ft. * WHERE...Riverside County Mountains and San Diego County Mountains. * WHEN...From 10 AM Tuesday to 8 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Moderate HeatRisk. Elevated lows will limit overnight relief from the heat.

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.

Other Active Heat Advisory Alerts

Heat Advisory issued September 7 at 11:55AM PDT until September 10 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

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; Los Angeles County San Gabriel Valley

Heat Advisory issued September 7 at 11:55AM PDT until September 10 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

Cuyama Valley; Santa Clarita Valley; San Luis Obispo County Beaches; 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 Central Coast Beaches; Santa Barbara County Inland Central Coast; Santa Ynez 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; Ventura County Beaches; Ventura County Inland Coast; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Southeastern Ventura County Valleys; Santa Susana Mountains

Heat Advisory issued September 7 at 1:16PM CDT until September 8 at 8:00PM CDT by NWS Fort Worth TX

Fannin; Lamar

Heat Advisory issued September 7 at 1:16PM CDT until September 8 at 8:00PM CDT by NWS Kansas City/Pleasant Hill MO

Doniphan; Atchison; Nodaway; Worth; Gentry; Harrison; Holt; Andrew; De Kalb; Daviess; Grundy; Buchanan; Clinton; Caldwell; Livingston; Ray; Carroll; Chariton; Lafayette; Saline; Howard; Johnson; Pettis; Cooper; Henry

Heat Advisory issued September 7 at 1:16PM CDT until September 8 at 8:00PM CDT by NWS Fort Worth TX

Montague; Cooke; Grayson; Wise; Denton; Collin; Hunt; Delta; Hopkins; Tarrant; Dallas; Rockwall; Kaufman; Van Zandt; Rains; Johnson; Ellis; Henderson; Navarro

Source: National Weather Service.