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Northern California’s Interior Hits Hottest Temperatures of the Year as Triple-Digit Heat Persists

A powerful high-pressure ridge has driven interior temperatures above 105°F under a heat advisory.

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

  • Redding is forecast to reach around 110°F from Friday through Sunday and Sacramento could climb to about 105°F, marking the hottest weather of the summer so far.
  • The National Weather Service has extended a heat advisory in the northern Sacramento Valley through 11 p.m. Monday and issued a separate advisory for the San Joaquin Valley until Tuesday evening.
  • A persistent marine layer and strengthening sea breezes have kept immediate coastal Bay Area highs in the 60s and 70s while inland shoreline communities warm into the 80s and low 90s.
  • Smoke drifting south from the Green Fire in Shasta County has degraded air quality to unhealthy levels for sensitive groups across parts of the Sacramento Valley.
  • Overnight lows are expected to remain in the 70s in much of the interior, offering little relief before temperatures gradually return to near-normal by midweek.