Thursday was another gorgeous day for northern California with big swings in temperature from the cool morning lows to our unseasonably warm daytime highs due to the clear, dry air. A minor cooldown arrives Friday. A large ridge of high pressure is in control of our weather right now, but it will briefly give way to a trough of low pressure by tomorrow afternoon. Tonight will be another clear and seasonably cool night with lows ranging from the teens, 20s and 30s in the mountains to the 40s and 50s in the valley and foothills. Friday will be a mostly sunny and warmer than average day, only a degree or cooler than Thursday. Highs will range from the 60s and 70s in the mountains to the 70s and lower 80s in the foothills and the valley.
The fast-moving trough of low pressure which will bring a few high clouds and a modest cooling of our temperatures will be on its way out of our region on Saturday, and the strong ridge of high pressure will once again regain control of our weather pattern. We can expect plenty of sunshine and above average temperatures through the weekend. A larger trough of low pressure from the eastern Pacific will start breaking down that ridge early next week, and we can expect a gradual increase in clouds, a decrease in temperatures, and stronger breezes by late next week. Highs will remain above average, however, despite the cooling. Highs will range from the 60s and 70s in the mountains to the 70s and lower 80s in the valley.