Marine layer sweeps in over the coastal valleys and beaches Monday morning

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Posted at 5:06 AM, Oct 19, 2020
and last updated 2020-10-19 09:30:35-04

It will be a foggy start to the week as the marine layer fills in over coastal regions Monday morning.

As the afternoon approaches, most coastal valley regions will see plenty of sunshine but it's possible some coastal regions could stay fairly foggy at least through early afternoon due to weak onshore flow.

Daytime highs at the coast will range from the mid-to-upper 60s with wind speeds below 10 miles per hour. For the coastal valleys, some areas will be warmer than others. Towards Santa Maria Valley, temperatures are expected to peak in the mid-70s, while San Luis Obispo will likely hang on to the low 80s. Inland valleys will remain on the warmer side with daytime highs from the upper 80s to low 90s, but these temperatures will trend down fairly significantly by the weekend when daytime highs drop to the 70s.

A trough will dig into the state Wednesday, which will likely increase the marine layer and allow for an additional one to three degrees of cooling. The cooling trend will continue through the weekend.