San Francisco Bay - South San Francisco Weather Forecast

    • 42
    • 55

    Increasing Clouds

    • 42
    • 55

    Mostly Sunny

    • 41
    • 57

    Mostly Sunny

    • 42
    • 57

    Mostly Sunny

    • 45
    • 57

    Slight Chance Rain Showers

    • 48
    • 57

    Rain Showers Likely

Today 27 Dec San Francisco Bay Shoreline

Partly cloudy in the morning then becoming sunny. Highs in the mid 50s. Northwest Winds 5 to 10 Mph.

Tonight 27 Dec San Francisco Bay Shoreline

Mostly clear in the evening then becoming mostly cloudy. Lows near 40. Northeast Winds 5 to 10 Mph.

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  • Temperature Real-Time

San Francisco Bay - South San Francisco Temperature Statistics

December Temperature

San Francisco, San Francisco International Airport (3.1 miles)

  • Lowest 15 December, 2025

    44.1 °F

  • Average December

    52.6 °F

  • Highest 19 December, 2025

    64 °F

Climate (2020–Present)

San Francisco, San Francisco International Airport (3.1 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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