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2h ago

Northern California Heats Up for Labor Day as Ridge Builds, 100s Return Next Week

A strengthening high-pressure ridge drives a late-summer warmup with triple-digit heat returning to valley locations early next week.

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Plenty of sunshine can be expected as temperatures warm to mid and upper 90 this afternoon in the valley.

Overview

  • Valley highs climb into the mid to upper 90s through the holiday weekend, with some spots near 100 degrees on Saturday and Sunday.
  • Temperatures are expected to reach near or above 100 degrees next Tuesday and Wednesday, with local forecasts designating Impact Days for the heat.
  • Labor Day Monday trends slightly cooler into the upper 90s as a delta breeze picks up before heat intensifies again midweek.
  • Smoke from the Garnett Fire, about 14,000 acres in Fresno County, will reduce air quality across the Mammoth–Yosemite corridor and could reach parts of the inland Bay Area and Southern California.
  • Rain chances remain low, limited to isolated high-elevation showers Friday and a modest risk of Sierra thunderstorms Tuesday and Wednesday afternoons.