Sunday brought cooler temperatures with highs plummeting anywhere from 5-15º down from Saturday. Monday, that cooling continues. Highs will peak in the 60s for a majority of San Diego County, which is cooler than a typical mid-October day.
This drop is due to a shift in winds. Saturday, a slight Santa Ana wind event brought dry, warm air. Sunday, winds shifted to become more onshore, bringing in cooler, moist air from the Pacific.
A system is dropping down California through the next day, bringing much-needed rain and some snow to Northern and Central California. Southern California is too far south to see significant rain, but that pattern is going to increase moisture in the region and bring slight rain chances. That increase in moisture will create fog overnight Sunday and into Monday morning. Light rain is possible through that time frame from the coast to the mountains. Those rain chances fizzle out by the afternoon hours.
After a gloomy and cold Monday, temperatures will slightly recover into the end of the workweek. Conditions will dry out until another storm brings more rain chances and another drop in temperatures by next weekend.
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