Weaker onshore flow will result in warming for some coastal valley locations Thursday.
Before the afternoon, the morning marine layer will continue to hover over coastal locations through the morning commute with late morning and afternoon clearing.
The beaches will range from the 60s and 70s, while coastal valley locations will range from the 70s up to the upper 80s. Inland valley communities will have fairly similar temperatures compared to the forecast on Wednesday. Daytime highs across the interiors will mainly be in the 90s, but some areas like San Miguel could reach triple digits.
Northwesterly winds will be slightly windier Thursday across the Central Coast. Wind speeds are expected to range from 15-25 miles per hour through Thursday afternoon.
An excessive heat warning will go into effect Friday, first for the inland valley communities across San Luis Obispo and Santa Babara Counties. Daytime highs will likely range from 94 degrees up to 116 degrees through Labor Day, which is when the warning is set to expire. The beaches and coastal valleys will be put under the same warning starting Saturday at 10 a.m. until Sunday at 8 p.m. Daytime highs across coastal valley locations will range from 88 degrees up to 103 degrees over the weekend, with coastal temperatures expected to range from the 70s and 80s. High pressure over the Nevada, Utah border is the reason for the major uptick in daytime highs.