Chamber of Commerce weather for Northern California on Thursday with abundant sunshine, seasonal highs and light winds. More clouds will arrive on Friday, with bigger and more welcome weather changes ahead. Our region is currently between two disturbances, which has resulted in lower winds, more sunshine and seasonal mild weather at the end of October. High clouds will arrive tonight and tomorrow, however, and that will signal another pattern shift. We will have high clouds tonight but lows will still drop to 20s and 30s in the mountains with 40s in the foothills. A freeze advisory is also in effect for Trinity and Siskiyou counties. Friday will be partly cloudy and slightly cooler with highs ranging from the 50s in the mountains to the 70s in the valley.
We will also have partly cloudy skies for at least the first half of Saturday before this batch of clouds breaks out, and we will end up with mostly sunny skies the rest of the weekend. As Halloween Monday and the early days of November approach, a larger Pacific storm will also approach the West Coast. We will have more and more cloud on Monday, but most (if not all) of our region should remain dry for Halloween. We will have a better chance of rain showers and snow showers at high altitudes on Tuesday and Wednesday, and it could last until next Thursday. We will also have stronger breezes next Tuesday and Thursday. Valley lows will remain in the fairly seasonal 40s, while valley highs will move from the seasonal 70s this week to the 50s and 60s next week.