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Record Temperatures Forecast as Winter Heatwave Heads for California

An unusual winter heatwave is expected across California this week with record temperatures in the forecast for multiple cities from the San Francisco Bay Area to Los Angeles.

In Southern California, where temperatures are predicted to be 15 to 20 degrees above normal from Wednesday morning through Sunday, the National Weather Service upgraded a heat watch to a heat advisory.

The heat watch and advisory were the first to be issued by the Los Angeles weather office in the month of February, according to records dating to 2006. Most heat watches and warnings in the area are issued from May through October.

Hottest Temperatures of the Week Expected in San Diego County

The hottest temperatures of the week are expected Wednesday throughout San Diego County, but relief will arrive this weekend, according to the National Weather Service.

High pressure over Baja California will keep temperatures warm through Friday throughout the county, then temperatures will drop quickly and return to around seasonal average on Sunday, forecasters said.

A heat advisory is in effect until 9 p.m. Friday in the western valleys and an excessive heat watch will also last until 9 p.m. Friday in the deserts.

High temperatures Wednesday are forecast to reach 82 degrees near the coast, 90 inland, 96 in the western valleys, 95 in the mountains and 110 in the deserts.

Sweltering Heat to Start Gripping San Diego County Tuesday

Temperatures will soar well into the triple digits Tuesday in the San Diego County deserts as sweltering conditions are expected to grip the region until this weekend.

High pressure centered over Baja California will continue to build this week, with temperatures expected to peak on Wednesday and Thursday, according to the National Weather Service. Desert areas could reach 110 and 107, respectively, on those days.

Heat Wave Expected to Keep Deserts and Inland Valleys Hot All Week

Temperatures could reach triple digits Monday in the San Diego County deserts, and the mercury will be on the rise all week throughout the region, according to the National Weather Service.

Conditions will be relatively mild west of the deserts Monday, but building high pressure will cause temperatures to rise throughout the county until Friday, forecasters said. By midweek, high temperatures could be 15-20 degrees above average in most areas, forecasters said.

The NWS issued a heat advisory that will be in effect from 10 a.m. Tuesday to 9 p.m. Friday in the western valleys.

An excessive heat watch will also take effect Tuesday morning and last until Friday evening in the county deserts.