The heat is on this Labor Day Weekend as a high pressure builds in. Temperatures are expected to stair step their way into the century mark by Monday, while Sunday can expect the upper 90s for most in the valley with a few pockets of 100 degrees. Monday is expected to be the hottest day of the period ahead with many places in the valley topping out around 102 degrees while the foothills reach the upper 80s to low 90s. We can also see the chance for some high level clouds to move in, giving a chance for filtered sunshine on Monday. In terms of the air quality, most of the smoke is expected to be concentrated in the mountains with mainly hazy conditions in the valley and foothills farthest away from the fires.
As we start the 4-day work week, the heat will linger with many areas at or slightly below their Monday highs. The pattern begins to change as we approach the end of the week with a low pressure system approaching the west coast. Temperatures will begin to drop into the low 90s to upper 80s for most by Thursday for the valley. During this time, the extent of the impacts from the low pressure system for the valley will be cooler temperatures, some windy conditions, and a chance for a partly cloudy sky at times. The mountains will see an increased chance for showers and thunderstorms as some monsoonal moisture may filter into the area Thursday into Saturday along with the cooler temperatures, windy conditions and windier conditions. The details of this part of the forecast are still coming in at this time, however it will be a significant change compared to the 100 degree heat expected this weekend.