Autumn’s arrival brings sharp transitions to Bay Area weekend weather, significant storm to follow

  • Latest forecast:How the first major Pacific storm of the rainy season will impact California

The first official weekend of autumn arrives and each day will feel a little different, thanks to a stubborn upper-level low pressure system drifting across the state.

This weekend won’t bring the kind of steady, predictable weather pattern California is known for. Instead, the weather will swing in noticeable ways, in the Bay Area and statewide.

Bay Area transitions

Friday will be warm, with North Bay and East Bay valleys reaching into the 90s. But unlike Tuesday’s widespread heat, the coast and bayside communities will stay cooler, with San Francisco and Oakland holding in the 70s under a stronger sea breeze and marine layer.

Saturday eases down another notch. Sunshine will dominate, but the 90s disappear, with most inland highs topping out in the 80s. San Francisco and Oakland stay in the 70s, slower to clear morning clouds…

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