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Port Costa, California

Current conditions and the National Weather Service 7-day forecast for Port Costa, California — temperature, rain chance, wind, radar and active alerts.

Saturday Oct 3: a high near 96°F and a low around 66°F. Highs over the period run 81°F to 96°F.

National Weather Service forecast for Port Costa, California
DayHighLowPrecip
Saturday Oct 396°66°—
Sunday Oct 495°63°—
Monday Oct 595°64°—
Tuesday Oct 695°64°—
Wednesday Oct 795°63°—
Thursday Oct 891°60°—
Friday Oct 981°——

NOAA NWS NDFD 2.5 km, run 2026-10-03 15:00 UTC · days are local time in America/Los Angeles. The live page updates continuously.

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