Upper Crystal Springs Reservoir Weather Forecast

    • 54
    • 73

    Becoming Sunny

    • 55
    • 77

    Sunny

    • 55
    • 76

    Mostly Sunny

    • 53
    • 68

    Partly Sunny

    • 53
    • 69

    Partly Sunny

    • 56
    • 70

    Chance Rain

Today 19 Oct San Francisco Bay Shoreline

Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the 70s. Northwest Winds 5 to 10 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 19 Oct San Francisco Bay Shoreline

Mostly clear. Lows in the upper 50s. Northwest Winds around 5 Mph.

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Upper Crystal Springs Reservoir Temperature Statistics

October Temperature

San Carlos Airport (4.3 miles)

  • Lowest 14 October, 2025

    48.2 °F

  • Average October

    61.7 °F

  • Highest 6 October, 2025

    86 °F

Climate (2020–Present)

San Carlos Airport (4.3 miles)

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  • Average Low 2020–2025

    51.2 °F

  • Average 2020–2025

    56.5 °F

  • Average High 2020–2025

    68.1 °F
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