Foster City Weather Forecast

    • 53
    • 70

    Rain

    • 51
    • 65

    Rain Showers

    • 49
    • 66

    Chance Rain

    • 50
    • 69

    Partly Sunny

    • 51
    • 70

    Partly Sunny

    • 52
    • 69

    Partly Sunny

Today 20 Apr San Francisco Bay Shoreline

A chance of rain in the Morning, then Showers likely and a slight chance of Thunderstorms in the afternoon. Some Thunderstorms may produce small hail in the afternoon. Highs in the upper 60s. South Winds 10 to 20 Mph.

Tonight 20 Apr San Francisco Bay Shoreline

Rain. Lows in the mid 50s. Southwest Winds 10 to 20 Mph. Becoming south 5 to 10 Mph after midnight.

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Foster City Temperature Statistics

April Temperature

San Carlos Airport (3.1 miles)

  • Lowest 18 April, 2026

    48.2 °F

  • Average April

    58.2 °F

  • Highest 5 April, 2026

    82.4 °F

Climate (2021–Present)

San Carlos Airport (3.1 miles)

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  • Average Low 2021–2026

    51.6 °F

  • Average 2021–2026

    56.9 °F

  • Average High 2021–2026

    68.3 °F
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