Shallow marine layer along the coast will cool temperatures at the beaches on Thursday. That marine layer will hug the coastline in the morning and create a patchy fog that is expected to stay there throughout most of the morning and part of the afternoon, keeping daytime highs from the low 60s to upper 70s. Hurricane John is moving northwestward and is already impacting certain parts of California’s coastline. A beach hazards statement is issued for San Luis Obispo and Santa Barbara Counties beaches through Saturday as the hurricane will bring high surf around seven feet between 7:00 and 9:00 p.m.
Coastal valleys will still be on the warmer side on Thursday and range from the upper 70s to low 90s with patchy fog playing a factor ahead of late morning clearing. The interior valleys will slowly come out of the triple-digit temperatures over the next two days, but on Thursday expect daytime highs to still be in the low 100s.
Saturday looks to be a transitional day for the interior portions because that’s when the low 90s will make their return and be much more widespread. Until then, an excessive heat warning will remain in place for Santa Barbara County through 8:00 p.m. Thursday.