hot sun
Photo courtesy National Weather Service

More triple-digit heat is expected to bake parts of the region Tuesday, but forecasters said conditions will cool off considerably by the Fourth of July weekend.

A heat advisory will be in effect in the Los Angeles and Santa Monica mountains until 8 p.m. in the San Fernando, San Gabriel and Santa Clarita valleys.

“The heat is on this afternoon as temperatures have already soared into the low 100s across many interior areas with 103 noted at Woodland Hills and 106 near Paso Robles,” according to a National Weather Service statement issued late Monday afternoon.

Temperatures are expected to drop off slightly on Tuesday — roughly by 3 to 6 degrees — but it will still be warm.

“Take extra precautions if you work or spend time outside,” forecasters advised. “When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible.”

In Orange County, heat advisories will be in effect until 8 p.m. for inland areas, including Santa Ana, Anaheim, Garden Grove, Orange, Fullerton and Mission Viejo, where temperatures could reach 97 degrees, according to the NWS.

Santa Ana Mountains and foothills will also be under a heat advisory until 8 p.m., with temperatures up to 96 anticipated.

Monday was the second straight day of elevated temperatures in the area. But after Tuesday’s heat, conditions are expected to start cooling.

“The heat will be a distant memory by the weekend as the trough and deepening marine layer will support near-normal temperatures,” according to the NWS. “Gusty winds will gradually return to interior areas.”

Forecasters said some areas will see a 20-degree drop in temperature between Tuesday and Thursday, with highs returning mostly to the 70s and 80s, except for traditionally warmer valley and interior areas. They noted that conditions will remain very dry, keeping the fire danger high even without gusty winds in the forecast.

“A low pressure system will move into the area on Wednesday, bringing southwest flow aloft and gradually cooling temperatures,” forecasters said. “Overnight low clouds will continue to affect coastal areas through Wednesday, and may extend to some coastal valleys as well.”

As usual during heat waves, forecasters urged people to drink plenty of fluids, seek out air conditioned spaces and check in on vulnerable relatives and neighbors.

“Young children and pets should never be left unattended in vehicles under any circumstances. This is especially true during warm or hot weather when car interiors can reach lethal temperatures in a matter of minutes.”

A list of cooling centers in Los Angeles County can be found at Information about cooling centers in the city of Los Angeles can be found by calling 311.

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