The warming trend experienced by San Diego County this weekend will turn cool by mid-week, with a chance for rain later in the week, forecasters said Sunday.

Cooler conditions are expected by Tuesday, although highs will remain above average as the area of high pressure weakens ahead of an incoming low pressure system, the National Weather Service in San Diego said.

The marine layer will begin to deepen by mid-week, diminishing chances for coastal dense fog. Cooler conditions will also spread inland due to the increase in onshore flow.

By Wednesday, high temperatures are expected to return to near normal west of the mountains, but remain about 10 degrees above average in the deserts.

Highs along the coast will reach 80 Tuesday, dropping to the 70s Wednesday and the 60s Thursday through

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