A significant warming trend is expected to begin Monday across Southern California, with temperatures climbing well above normal by midweek and a heat advisory taking effect Tuesday for much of Los Angeles County.
The advisory, issued by the National Weather Service, will be in effect from 8 a.m. Tuesday through 9 p.m. Thursday for the valleys, the San Gabriel Mountains and the Los Angeles County inland coast, including downtown Los Angeles.
“Afternoon high temperatures away from the coast are forecast to warm up to 4-10 degrees above normal beginning Tuesday,” according to the weather service.
Forecasters said temperatures in many inland areas could reach the middle to upper 90s, with the hottest conditions expected Wednesday. Downtown Los Angeles could see temperatures in the mid- to upper 80s, while many inland valleys are forecast to reach the low to middle 90s.
“There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors,” the NWS said.
Higher humidity is also expected to add to the discomfort during the afternoon hours, forecasters said.
The warming trend is being driven by strengthening high pressure over the Desert Southwest. Temperatures are expected to rise steadily through Wednesday during the first full week of summer.
“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors,” the weather service advised.
Forecasters said temperatures should begin to ease slightly after Thursday, although conditions are expected to remain above normal through next weekend.