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yesterday

NorCal Keeps Summer Chill as Weekend Heat Briefly Returns

A reinforced marine layer has held mid-July highs below average with a brief rise into the low 90s expected before a new cool system arrives.

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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

  • A flattened jet stream and a stronger-than-normal North Pacific High have stirred cooler coastal waters and reinforced the marine layer and delta breezes that keep valley highs in the 80s to low 90s.
  • Forecast models show valley highs warming back into the low 90s by Friday and climbing into the mid-90s over the weekend before another cool system brings highs back into the 80s early next week.
  • Inland spots such as Redding and Fresno may see brief triple-digit spikes but those hot spells will be short-lived due to persistent onshore flow.
  • A stray thunderstorm is possible Wednesday in Mono County with dry conditions elsewhere across Northern California through the week.
  • Cooler temperatures have lowered fire weather risks with forecast data indicating statewide highs staying below average through the end of July.