As we roll into the weekend in San Diego, expect a drop in temperature due to weakening high pressure. Saturday's cooler temperatures will be accompanied by onshore flow, which is likely to continue into Sunday, when temperatures are forecast to be at or below normal. Monday promises a slight shift, with a weak northerly flow leading to warmer conditions along the coast and in the valleys, while cooling conditions prevail inland, according to the NWS San Diego.
The detailed forecast discussion by the National Weather Service San Diego paints a marine-like picture through the weekend, with a weak coastal eddy stirring up more extensive coverage of night and morning coastal low clouds and fog. "A weak coastal eddy has developed," and alongside stronger onshore flow, the marine layer is expected to thicken, spreading inland and cooling our temps. Nightly fog is also anticipated, especially dense in locations such as Long Beach and Los Alamitos, where visibility could drop to a quarter mile or less.
The marine influence will be asserting itself, ensuring that today's high temperatures are a bit chillier than those experienced on Thanksgiving by 4 to 8 degrees for coastal and valley areas. The mountain and high desert areas, however, might still see temperatures 4 to 8 degrees above average. If you're near the coast, expect lower to mid-60s, while valley denizens can look forward to around 70, and the lower deserts bask in the 70s.
Looking ahead to next week, Monday will exhibit a seesaw effect with the mountains and high deserts cooling 4 to 8 degrees and the coast and valleys getting a tad warmer. Come Wednesday and Thursday, a low-pressure system tracking down the West Coast could mix things up, nudging temperatures down further and potentially inviting some rain if it takes a favorable path.
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