Foggy skies persist across valley locations and long the coastline Wednesday morning. The marine layer will continue to linger along the coast through the afternoon hours, but looking ahead to Thursday, high pressure aloft will allow the marine layer to weaken, which means it won't be as persistent through the afternoon hours, especially by the weekend.
Temperature-wise, daytime highs are starting to trend up Wednesday for valley locations. Daytime highs at the coast will be in the 60s, coastal valleys will stay close to the 70s and the interior valleys will range from the mid-80s to mid-90s. By Thursday, it's expected that there will be about four to ten degrees of warming for coastal valleys and beaches and nearly 12-15 degrees of additional warming for the inland valley communities.
Northwesterly and southwesterly winds will be mild to moderate Thursday with wind speeds from 10-20 miles per hour. These winds will increase starting to Thursday with the potential to reach nearly 25 mph.
There's a major shift in the forecast as high pressure continues to move towards the four corner states, which will have some major impacts for the Central Coast. An excessive heat watch will go into effect Friday for the inland valleys in San Luis Obispo and Santa Barbara Counties. The same watch will go into effect for coastal locations starting Saturday. Daytime highs across the interiors over Labor Day Weekend will range from the low 100s up to 113 degrees. The coastal valleys will have a mix of 80s, 90s, and low 100s, and the beaches will stay close to the 70s and 80s. The bottom line is that all areas will experience above-average temperatures that will last through the start of next week.