Be prepared for more dangerous heat on the way in your Tuesday forecast. High pressure is still parked along the coast and will continue to dominate our forecast over the next several days. This will result in well above average temperatures across northern California, and the potential for more record heat in some cities Tuesday. The Excessive Heat Warning in effect for the valley and foothills has been extended through 9pm Wednesday, but the Heat Advisory in effect for Trinity & Siskiyou County areas is still set to expire at 8pm Tuesday night. Skies are mostly clear across northern California for the start of your Tuesday, and we'll be staying sunny to mostly sunny through the day. Temperatures are starting out in the 60's to 70's in the valley and foothills, while mountain areas are ranging from the 40's to 50's for the start of your Tuesday morning. South winds to 10mph are expected today, and gusts up to 20mph will be possible this afternoon and evening. Humidity has not recovered very well overnight, but is not expected to end up quite as low as Monday. High temperatures are projected to range from around 103 to 110 degrees in the valley this afternoon, while foothill and Sierra locations end up in the upper 80's to upper 90's, and cities in the Northern Mountains top out in the upper 90's to lower triple digits. The hot, dry, and breezy conditions will keep our fire danger in the high range this afternoon, but the good news is our winds will not be very strong.
We'll still be very hot on Wednesday, but most areas will see temperatures drop by a few degrees compared to Tuesday. Valley and foothill areas will start out in the 60's to 70's, while mountain areas range from the 40's to 50's Wednesday morning. High temperatures will end up in the 100 to 108 degree range in the valley, while most foothill and mountain areas top out in the 80's to 90's. We'll be staying hot through the rest of this week, with upper 90's ot lower triple digits projected for the valley from Thursday through Saturday. Foothill and mountain areas will also continue to top out in the 80's to 90's from Thursday through Saturday. There will be a very slight chance for some light showers and isolated thunderstorm activity in areas of the Sierra and Southern Cascades on Wednesday and Thursday afternoons, but that threat is mostly expected to stay out of our region.
Temperatures will stay very toasty for the start of your weekend, but we'll start to finally see temperatures falling by a few degrees on Sunday. Valley areas are projected to start out in the 60's and end up in the upper 90's to triple digits on Saturday, and then top out in the mid 90's on Sunday. Most mountain and foothill areas will end up in the 80's on Sunday afternoon. We'll continue to see temperatures dropping for the start of next week, as valley areas are projected to end up in the mid to high 80's on Monday. Most foothill and mountain areas will end up in the 70's to lower 80's for the start of next week. So, there is an end in sight to the dangerous heat, but we'll still be dealing with the very hot conditions through the rest of this week. Make sure you're drinking enough water and dressing for the hotter temperatures. Also, try to continue to limit your outdoor activities to the morning hours if you can.