Clearing skies will allow some wind sheltered valleys to see temps drop to frosty levels overnight into Monday. Monday should see sunshine but continued cool temps with highs mainly in the low to mid 50s.
Tuesday won’t be quite as cold in the morning as clouds increase, but those same clouds will likely keep daytime warming at a minimum so highs could be in the 40s to low 50s, very Decem-brr. The clouds are part of a weather system that will bring some rain chances, possibly as early as late Tuesday afternoon with the best chances arriving as it crosses the coast into early Wednesday.
From there, high pressure will rebuild, sending rain chances to the North, at this point “North” means areas from near the Sonoma County / Mendocino County border north into Oregon. We should see temps warming slightly to wrap up the week thanks to high pressure and a more moisture rich plume of air arriving into Saturday.
Rain chances will likely return midway through next weekend, which we’re watching closely for possible impacts on the 49ers game vs. the Rams which you can see here on NBC Bay Area on Saturday. Rain will change to showers heading into Sunday afternoon.