SAN DIEGO- Forecasters are expecting cooler weather across San Diego County this week, with a steady stream of high clouds for much of Saturday.
Heavy fog affected parts of the coastline Saturday morning, with multiple reports of visibilities below 100-200 feet, the National Weather Service (NWS) said.
“However, temperatures should rise to 70-80 degrees in most inland valleys, making it the warmest of the next seven days,” forecasters said.
High temperatures along coastal areas on Saturday were expected to be 66 to 71 degrees, with overnight lows of 48 to 54, the NWS said.
Inland Valley highs will be 76-81 with overnight lows of 50-57. And mountain highs were expected to be 68-75 with overnight lows of 45-55. Desert highs will hover around 84 degrees with nightly lows of 55-65.
The dense, scattered fog may re-develop along parts of the coast from Saturday night through Sunday morning, but coverage will likely be limited, forecasters said.
The development of weak low pressures at the upper levels on Sunday and Monday along the west coast will force a drop in temperatures until Monday, when maximum temperatures will remain mainly in the 60s west of the mountains.
“The onshore flow will revitalize the marine layer Sunday night, with more expansive low clouds affecting coastal areas and valleys,” the NWS said. “A slight flow offshore may raise temperatures a little Tuesday as the trough moves east, but winds will be weak given the marginal surface pressure gradients.”
A second channel will follow closely on Wednesday and Thursday, bringing additional cooling and a return to an onshore wind regime, along with a deeper sea layer.
“This should make Thanksgiving a bit cooler than normal, with a small chance of light patchy drizzle west of the mountains,” forecasters said.
Over coastal waters, dense and patchy fog is possible from Saturday afternoon through Sunday morning, with visibility below a nautical mile.