Foster City Weather Forecast

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    Rain

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    Rain

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    Rain

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    • 59

    Rain

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    Rain

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    Rain

Today 19 Dec San Francisco Bay Shoreline

A slight chance of rain in the Morning, then rain in the afternoon. Highs in the lower 60s. South Winds 10 to 20 Mph.

Tonight 19 Dec San Francisco Bay Shoreline

Rain in the Evening, then rain likely after midnight. Lows in the mid 50s. South Winds 10 to 20 Mph. Becoming southeast 5 to 10 Mph after midnight.

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Foster City Temperature Statistics

December Temperature

San Carlos Airport (3.1 miles)

  • Lowest 12 December, 2025

    39.2 °F

  • Average December

    48.1 °F

  • Highest 3 December, 2025

    64.4 °F

Climate (2020–Present)

San Carlos Airport (3.1 miles)

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  • Average Low 2020–2025

    51.3 °F

  • Average 2020–2025

    56.6 °F

  • Average High 2020–2025

    68 °F
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