Foster City Weather Forecast

    • 60
    • 77

    Gradual Clearing

    • 60
    • 73

    Mostly Cloudy

    • 59
    • 73

    Mostly Cloudy

    • 59
    • 74

    Mostly Cloudy

    • 58
    • 73

    Mostly Cloudy

    • 59
    • 73

    Mostly Cloudy

Today 12 Aug San Francisco Bay Shoreline

Mostly cloudy late in the morning then becoming partly cloudy. Highs in the 70s to lower 80s. Northwest Winds 5 to 10 Mph. Becoming west 10 to 20 Mph in the afternoon.

Tonight 12 Aug San Francisco Bay Shoreline

Partly cloudy in the evening then becoming mostly cloudy. Lows around 60. Southwest Winds 10 to 20 Mph.

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Foster City Temperature Statistics

August Temperature

San Carlos Airport (3.1 miles)

  • Lowest 1 August, 2026

    59 °F

  • Average August

    64.8 °F

  • Highest 2 August, 2026

    87.8 °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

    68.4 °F
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