San Francisco Bay - Belmont Slough Entrance Weather Forecast

    • 50
    • 61

    Chance Rain

    • 54
    • 63

    Rain

    • 54
    • 60

    Rain

    • 54
    • 61

    Rain

    • 49
    • 59

    Rain

    • 49
    • 58

    Rain

Today 18 Dec San Francisco Bay Shoreline

Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. Highs around 60. Light Winds.

Tonight 18 Dec San Francisco Bay Shoreline

Mostly cloudy. A slight chance of rain in the Evening, then a chance of rain after midnight. Patchy fog after midnight. Lows in the lower 50s. Southwest Winds up to 5 Mph. Becoming south around 5 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

San Francisco Bay - Belmont Slough Entrance Temperature Statistics

December Temperature

San Carlos Airport (1.9 miles)

  • Lowest 12 December, 2025

    39.2 °F

  • Average December

    47.8 °F

  • Highest 3 December, 2025

    64.4 °F

Climate (2020–Present)

San Carlos Airport (1.9 miles)

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  • Average Low 2020–2025

    51.3 °F

  • Average 2020–2025

    56.6 °F

  • Average High 2020–2025

    68 °F
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