A trough of low pressure will move over California and the rest of the West Coast over the next few days, and we can expect a temporary downturn in temperatures to below avearge levels. There will be areas of smoke in the air tonight, but we can expect a mostly clear to clear sky tonight with seasonably mild lows ranging from the 40s and 50s in the mountains to the 60s and lower 70s in the foothills and the valley. Tuesday will be a mostly sunny to sunny day with areas of smoke along with a few more clouds over the mountains. Highs will range from the 80s and lower 90s in the mountains to the 90s and lower 100s in the foothills and valley.
The trough pushing over the West Coast will bring more breezes and a larger cooldown on Wednesday. Although it will still be hot, highs Wednesday will be some of the coolest we've had this summer. The cooldown will be brief, however, as the trough leaves Thursday and another ridge of high pressure builds over the western United States Friday and this coming weekend. We'll have more sunshine and a return of the hotter than average weather through early next week. Overnight lows will remain seasonably mild, mainly in the 50s and 60s. Daytime highs will be mainly in the 90s with some upper 80s in the mountains and lower 100s in the valley.