Temperatures will stay around or above average in most areas today but will be several degrees cooler than yesterday, and air quality will stay in a decent range for most of the day. High pressure off to our east in the Desert Southwest and off the coast in the Pacific will be keeping us dry and very warm today. High pressure willl then build into our region this weekend and that will result in a big uptick in temperatures. The National Weather Service out of Sacramento has issued an Excessive Heat Watch from Saturday through Tuesday in your extended forecast.
Skies are clear and air quality is mostly in the good to moderate range across northern California for the start of your Wednesday. Temperatures are starting out cooler in most areas with lighter winds to start the day. Valley and foothill areas are in the 60's to low 70's this morning, while mountain areas are ranging from the high 40's to low 50's in the Sierra/Cascades to the 60's in the Northern Mountains. Winds are mostly light and out of the northeast this morning, but will be up to around 10mph out of the south this afternoon. The shift in the winds will likely result in a modest decrease in air quality heading into your afternoon, but will also keep out temperatures several degrees cooler than Tuesday. Humidity is expected to be slightly higer and will mostly end up in the 20 to 35 percent range this afternoon. High temperatures are projected to end up in the 91 to 102 degree range in the valley, while foothill and mountain areas end up in the mid 80's to mid 90's. Higher humidity, lighter winds, and cooler temperatures will put fire danger back into the moderate to high range today. Without the impacts of dry fuels fire danger would exclusively be in the moderate range, but unfortunately we do have very dry fuels.
High pressure from the Desert Southwest will build into our region over the next several days and that will result in a modest increase in high tempratures through the end of the week. Smoke will likely have bigger impacts to air quality later this week, so enjoy the improved conditions while they last. High pressure from our east will continue to build as we head into your weekend and that will result in a major uptick in high temperatures from Saturday through at least Labor Day on Monday. The current forecast puts valley areas in the 104 to 112 degree range from Saturday through Monday, while mountain and foothill areas top out in the 90's to lower triple digits. An Excessive Heat Watch has been put in place by the National Weather Service out of Sacramento from Saturday morning through Tuesday afternoon, but that could be allowed to expire on Monday. Models are currently hinting at an inside slider bringing a drop in temperatures to your Tuesday forecast, but it's still a little too early to tell how big of an impact that will have on northern California. Plan ahead for the hotter temperatures this weekend, and make sure you're doing everything you can to stay safe in the hotter conditions ahead. Dress for the heat, drink plenty of water, and stay inside somewhere with air conditioning as much as possible during the afternoon hours.