Foster City Weather Forecast

    • 46
    • 66

    Decreasing Clouds

    • 44
    • 65

    Mostly Sunny

    • 46
    • 66

    Partly Sunny

    • 48
    • 64

    Partly Sunny

    • 47
    • 63

    Partly Sunny

    • 46
    • 61

    Partly Sunny

Today 18 Jan San Francisco Bay Shoreline

Mostly cloudy in the morning then becoming partly cloudy. Highs in the mid to upper 60s. Northeast Winds around 5 Mph.

Tonight 18 Jan San Francisco Bay Shoreline

Partly cloudy. Lows in the mid 40s. North Winds up to 5 Mph.

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Foster City Temperature Statistics

January Temperature

San Carlos Airport (3.1 miles)

  • Lowest 10 January, 2026

    37.4 °F

  • Average January

    50.8 °F

  • Highest 16 January, 2026

    69.8 °F

Climate (2021–Present)

San Carlos Airport (3.1 miles)

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  • Average Low 2021–2026

    51.4 °F

  • Average 2021–2026

    56.6 °F

  • Average High 2021–2026

    68.1 °F
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