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CBS News 8 - San Diego, CA News Station - KFMB Channel 8 | cbs8.com

Steady to start, but toasty for the second half of the weekend

The low pressure system supplying the onshore flow will exit east over the weekend. This will allow high pressure to move in and crank up the heat Sunday and Monday.

Mostly sunny skies were predicted for San Diego County today with near-normal temperatures prevailing in most locations, the National Weather Service said.

Santa Ana conditions were expected to bring gusty northeast winds to the mountains and foothills, with substantial warming Sunday and Monday, forecasters said.

High temperatures along the coast Saturday were expected to be 64-69 degrees with overnight lows of 49-54, forecasters said. Highs in the inland valleys will be 72-77 with overnight lows of 48-53.

Mountain highs were expected to be 66-73 with overnight lows of 42-50. Desert highs will be 85-90 with overnight lows of 56-65.

High pressure will strengthen over the West Coast this weekend. We will shift from onshore to offshore flow across Southern California on Sunday. The warmest temperatures are expected Sunday and Monday for the coast and the valleys. While the peak days will be Monday and Tuesday for the mountains and desert.

Credit: KFMB-TV Weather Dept.

Additionally, the return of breezy Santa Ana winds will cause relative humidity values to drop into the teens and single digits on Sunday in response to this dry gusty air flow. This will lead to elevated fire concerns, especially in the valleys, foothills and mountains. Our risk will be moderate.

Credit: KFMB-TV Weather Dept.

Temperatures will cool by Tuesday as onshore flow picks up again ahead of a low pressure system. Temperatures will fall short of seasonal due to the cooler marine air with widespread 60s by Wednesday and Thursday. The stronger onshore flow will also deepen the marine layer and bring a chance for patchy morning drizzle to light rain across the coastal basin. 

Credit: KFMB-TV Weather Dept.
Credit: KFMB-TV Weather Dept.