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Delta Breeze Maintains Unusually Cool July Across Northern California

Valley highs have stayed in the 80s under persistent delta breeze, with forecasts calling for a spike into the mid-90s this weekend before another cooldown early next week.

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While much of the country will continue to experience extreme warmth and humidity, California will stay cool in the near term. 
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Thursday will be warmer, but highs will still remain a few degrees below normal.

Overview

  • A strong marine layer and delta breeze have held Northern California daytime highs below average, keeping valley temperatures mostly in the 80s and low 90s.
  • Forecasters predict a gradual warming trend into Friday with valley highs reaching the low 90s and climbing into the mid-90s over the weekend.
  • The Climate Prediction Center expects below-average temperatures to persist statewide through the end of July despite this weekend’s warm-up.
  • A stray thunderstorm remains possible in Mono County in generally dry conditions before another cool weather system arrives early next week.
  • Cooler temperatures have eased immediate fire weather risks, but ongoing fuel drying is likely to raise fire activity later this summer.