Foster City Weather Forecast

    • 56
    • 72

    Rain Showers Likely

    • 54
    • 69

    Rain Showers Likely

    • 50
    • 72

    Mostly Sunny

    • 53
    • 76

    Mostly Sunny

    • 54
    • 76

    Partly Sunny

    • 53
    • 74

    Partly Sunny

    • 53
    • 74

    Partly Sunny

Today 21 Oct San Francisco Bay Shoreline

Mostly cloudy. A slight chance of Showers in the afternoon. Highs near 70. Northwest Winds up to 5 Mph.

Tonight 21 Oct San Francisco Bay Shoreline

Mostly cloudy. A chance of Showers. Patchy fog after midnight. Lows in the mid 50s. Northwest Winds 5 to 10 Mph becoming south after midnight.

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Foster City Temperature Statistics

October Temperature

San Carlos Airport (3.1 miles)

  • Lowest 11 October, 2026

    48.2 °F

  • Average October

    62.3 °F

  • Highest 6 October, 2026

    89.6 °F

Climate (2021–2026)

San Carlos Airport (3.1 miles)

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  • Average Low 2021–2026

    51.8 °F

  • Average 2021–2026

    57 °F

  • Average High 2021–2026

    68.3 °F
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