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last wk.

Northern California Hits Triple-Digit Heat While Bay Area Stays Cool

A strong high-pressure ridge is driving valley highs above 100°F with similar conditions expected into early next week

Friday is forecast to be the hottest day since last July in much of the Sacramento Valley, with temperatures up to 110 degrees around Redding. The interior Bay Area will be relatively cooler, in the 90s.
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Southwesterly winds Saturday should help blow cooler air into the Bay Area and clean out the wildfire smoke.

Overview

  • A high-pressure ridge built in Thursday, pushing Sacramento and Central Valley temperatures to a season-high 100–105°F.
  • The National Weather Service has issued a heat advisory from 11 a.m. Friday through 11 p.m. Sunday for Oroville, Red Bluff, Yuba City and Redding due to elevated heat-related health risks.
  • Smoke from wildfires near Mount Shasta is drifting into the Sacramento Valley, producing haze and unhealthy air quality for sensitive groups.
  • Persistent onshore winds and cooler-than-normal ocean temperatures have reinforced the marine layer, keeping coastal Bay Area highs largely in the 60s and 70s.
  • Forecasters predict recurring triple-digit days through early next week before a gradual cooldown and marine-layer rebound around midweek.