Foster City Weather Forecast

    • 52
    • 78

    Mostly Sunny

    • 52
    • 79

    Mostly Sunny

    • 53
    • 76

    Partly Sunny

    • 52
    • 69

    Partly Sunny

    • 51
    • 70

    Mostly Sunny

Today 20 May San Francisco Bay Shoreline

Partly cloudy in the morning then becoming sunny. Highs in the 70s to upper 80s. West Winds up to 5 Mph. Becoming northwest 5 to 15 Mph in the afternoon.

Tonight 20 May San Francisco Bay Shoreline

Mostly clear. Lows in the lower 50s. West Winds 10 to 15 Mph decreasing to up to 5 Mph after midnight.

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Foster City Temperature Statistics

May Temperature

San Carlos Airport (3.1 miles)

  • Lowest 17 May, 2026

    50 °F

  • Average May

    58.6 °F

  • Highest 18 May, 2026

    80.6 °F

Climate (2021–Present)

San Carlos Airport (3.1 miles)

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  • Average Low 2021–2026

    51.7 °F

  • Average 2021–2026

    56.9 °F

  • Average High 2021–2026

    68.3 °F
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