Warmer conditions started off the week in Southern California, but this heat streak is expected to be much shorter than the last with a gradual cooling off and return to seasonal normal, forecasters said Monday, Sept. 26.
An excessive heat warning was issued for the Inland Empire and inland Orange County from 10 a.m. Monday through 8 p.m. Wednesday, before the cool down begins Thursday.
For the San Fernando Valley and a stretch of Los Angeles County that includes Beverly Hills down to inland Long Beach, the warning was only issued until Tuesday, as those areas are expected to slightly cool Wednesday.
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Heat advisories, a step down from warnings, were also issued for coastal Orange County through 8 p.m. Wednesday and the Santa Monica Mountains through Tuesday evening.
On Monday, in some places like Riverside, high temperatures were 15 degrees above seasonal normals. However, this heat streak will still be about 5-10 degrees cooler than earlier this month during an almost 10-day heat wave, forecasters said.
Good morning! A sunny and warm day is expected across Southern California, with high temperatures running 5-15 degrees above normal. Excessive Heat Warnings and Heat Advisories are in effect early this week, so stay hydrated and take it easy in the heat!#CAwx pic.twitter.com/3ooIowFkd7
— NWS San Diego (@NWSSanDiego) September 26, 2022
An increase of moisture Wednesday may mean a small chance of thunderstorms and showers across the San Bernardino County and Riverside County mountains and eastern Inland Empire valleys like the Coachella Valley.
Projected high temperatures Tuesday, according to the National Weather Service:
Downtown LA: 96
Long Beach: 86
Mission Viejo: 97
San Bernardino: 104
Van Nuys: 101