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4h ago

Delta Breeze and Marine Layer Sustain Cooler-Than-Normal Temperatures in Northern California

Onshore winds reinforced by a strong North Pacific High have suppressed midsummer heat with thermal rebound forecast for the weekend.

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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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High temperatures continue to drop below July normals today.

Overview

  • Valley highs have remained in the mid-80s to low-90s through midweek, several degrees below the seasonal average of 93°F.
  • A persistent delta breeze and thick marine layer have limited daytime heating and produced overcast mornings along the coast and Delta regions.
  • Forecasts call for a gradual warming to near-normal highs by Friday, with valley temperatures climbing back into the low to mid-90s over the weekend.
  • Mono County faces a slight risk of stray afternoon thunderstorms Wednesday, while most of Northern California stays dry through the seven-day outlook.
  • The Climate Prediction Center projects below-average temperatures statewide through July as a flattened jet stream and cooler coastal waters reinforce onshore flow.