Heat Advisory issued August 24 at 10:04PM PDT until August 28 at 8:00PM PDT by NWS San Diego CA

San Bernardino County Mountains

Urgency: Expected

Certainty: Likely

Onset: 8/25/2026, 5:04:00 AM

Expires: 8/25/2026, 1:15:00 PM

Details

* WHAT...Temperatures in the mid to upper 90s below 5000 ft MSL. * WHERE...San Bernardino County Mountains below 6000 ft. * WHEN...Until 8 PM PDT Friday. * 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.

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 August 25 at 12:36AM CDT until August 25 at 7:00PM CDT by NWS Houston/Galveston TX

Houston; Trinity; Madison; Walker; San Jacinto; Polk; Burleson; Brazos; Washington; Grimes; Montgomery; Northern Liberty; Colorado; Austin; Waller; Inland Harris; Chambers; Wharton; Fort Bend; Inland Jackson; Inland Matagorda; Inland Brazoria; Inland Galveston; Southern Liberty; Coastal Harris; Coastal Jackson; Coastal Matagorda; Coastal Brazoria; Coastal Galveston; Matagorda Islands; Brazoria Islands; Galveston Island; Bolivar Peninsula

Heat Advisory issued August 25 at 1:34AM AST until August 25 at 5:00PM AST by NWS San Juan PR

San Juan and Vicinity; Northeast; Southeast; Eastern Interior; North Central; Ponce and Vicinity; Northwest; Mayaguez and Vicinity; Southwest; Culebra; Vieques; St.Thomas...St. John.. and Adjacent Islands; St Croix

Heat Advisory issued August 25 at 12:19AM CDT until August 25 at 8:00PM CDT by NWS Shreveport LA

Sevier; Howard; Little River; Hempstead; Miller; Lafayette; Caddo; Bossier; De Soto; Red River; McCurtain; Red River; Bowie; Franklin; Titus; Camp; Morris; Cass; Wood; Upshur; Marion; Smith; Gregg; Harrison; Cherokee; Rusk; Panola; Nacogdoches; Shelby; Angelina; San Augustine; Sabine

Heat Advisory issued August 25 at 12:09AM CDT until August 25 at 7:00PM CDT by NWS Norman OK

Harmon; Greer; Kiowa; Comanche; Stephens; Garvin; Murray; Pontotoc; Coal; Carter; Johnston; Atoka; Love; Marshall; Bryan; Hardeman; Foard; Knox; Baylor; Archer

Heat Advisory issued August 25 at 12:09AM CDT until August 25 at 7:00PM CDT by NWS Norman OK

Beckham; Washita; Caddo; Grady; McClain; Cleveland; Pottawatomie; Seminole; Hughes

Source: National Weather Service.