A man with an umbrella walks on a sidewalk in Union Square during heavy rain in San Francisco on Feb. 13, 2025.

Cooler temperatures and breezier conditions are sweeping the Bay Area this week, with a modest chance of rain and thunderstorms on the horizon heading into the weekend, according to the National Weather Service. 

The change follows a period of relative warmth from a high-pressure system, but that’s quickly giving way to a series of wind channels —  also known as troughs — moving in from the Pacific. 

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“We start to see the weather becoming more unsettled, as we have today, until the weekend,” Rachel Kennedy, a meteorologist with the........

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