Marine layer over La Jolla Shores
The marine layer over La Jolla Shores. Courtesy HPWREN network

Monsoon moisture over San Diego County mountains and lower deserts should fuel isolated showers and thunderstorms Sunday afternoon, the National Weather Service said.

Satellite imagery Sunday morning looked more like June than late August, with extensive marine stratus offshore, forecasters said. It extended deep into the valleys.

The cloud layer was thicker based on pilot reports, and appeared to be deepening with even some spotty drizzle reports, which will ensure below-average high temperatures Sunday afternoon west of the mountains.

Farther inland, there were some low clouds Sunday morning in the San Diego deserts.

High temperatures along the coast Sunday were predicted to be in the mid-70s, highs in the western valleys were expected to be in the lower 80s and in the upper 80s near the foothills. Highs in the mountains were expected to be in the upper 80s and highs in the deserts were predicted to be 94 to 104, according to the weather agency.

Drier air and building high pressure Monday into Tuesday may limit any shower development, but a monsoon flow should return by Wednesday as high pressure weakens, renewing thunderstorm activity over mountain and desert areas.

The days were expected to be noticeably warmer Monday and Tuesday, especially in the valleys as the marine layer thins. It’s likely to be cooler again midweek as the marine layer deepens along with increasing clouds and humidity.

Longer-range outlooks show hotter conditions toward the end of the month as an upper high becomes established over the southwest, forecasters said.

City News Service contributed to this article.


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Ellen Bullock