Another mostly sunny and hot day for northern California today, quite similar to yesterday. Our weather will begin to change tomorrow, however, as a disturbance brings more clouds, cooler air, and a few showers and thunderstorms. The ridge of high pressure which has provided so much sunshine and heat to our area will get pushed aside Friday and Saturday by a trough of low pressure. We'll have increasing clouds overnight for a partly cloudy start to Friday. Lows will range from the 30s and 40s in the mountains to the 50s and 60s in the valley and foothills. Friday will be partly cloudy with a slight chance of mainly mountain showers and t'storms. Highs will range from the 70s in the mountains to the 80s and 90s in the valley and foothills.
The area of low pressure will continue moving southward over California on Saturday, and it will bring another chance of showers and thunderstorms. They'll once again be more likely over the mountains, but a few could sneak into the foothills or the valley. Lightning strikes are possible with any thunderstorms, so keep an eye to the sky. Otherwise, there may be a few areas which get brief heavy rain, hail and gusty wind, but that will be isolated. Sunday and Monday our weather will be quieter and warmer. Another trough of low pressure will bring more breezes and clouds Tuesday and Wednesday, and showers could occur, but they're not a guarantee. Next Thursday will be warmer. Valley highs will be in the 80s and lower 90s.