San Mateo Weather Forecast

    • 47
    • 62

    Becoming Sunny

    • 48
    • 66

    Mostly Sunny

    • 48
    • 68

    Mostly Sunny

    • 46
    • 67

    Mostly Sunny

    • 48
    • 65

    Partly Sunny

    • 49
    • 64

    Mostly Cloudy

Today 9 Dec San Francisco Bay Shoreline

Partly cloudy in the morning then becoming sunny. Areas of fog in the morning. Highs in the lower 60s. North Winds 5 to 10 Mph.

Tonight 9 Dec San Francisco Bay Shoreline

Mostly clear. Lows in the mid 40s. Northeast Winds 5 to 10 Mph.

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San Mateo Temperature Statistics

December Temperature

San Francisco, San Francisco International Airport (4.3 miles)

  • Lowest 2 December, 2025

    45 °F

  • Average December

    51 °F

  • Highest 3 December, 2025

    63 °F

Climate (2020–Present)

San Francisco, San Francisco International Airport (4.3 miles)

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  • Average Low 2020–2025

    52.4 °F

  • Average 2020–2025

    58.3 °F

  • Average High 2020–2025

    66.5 °F
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