Three Island Lake Weather Forecast

    • 22
    • 35

    Increasing Clouds

    • 28
    • 32

    Mostly Sunny

    • 27
    • 38

    Mostly Sunny

    • 28
    • 36

    Chance Snow

    • 27
    • 32

    Chance Snow

    • 25
    • 29

    Chance Snow

Today 16 Dec Upper San Joaquin River

Mostly sunny. Highs 40 to 56. West Winds up to 10 Mph.

Tonight 16 Dec Upper San Joaquin River

Partly cloudy. A 20 percent chance of rain after midnight. Near steady temperature in the mid 30s. Southwest Winds up to 15 Mph. Gusts up to 30 Mph increasing to 40 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Three Island Lake Temperature Statistics

December Temperature

Mammoth Yosemite Airport (23 miles)

  • Lowest 4 December, 2025

    10.4 °F

  • Average December

    35.2 °F

  • Highest 11 December, 2025

    66.2 °F

Climate (2020–Present)

Mammoth Yosemite Airport (23 miles)

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  • Average Low 2020–2025

    29.6 °F

  • Average 2020–2025

    46 °F

  • Average High 2020–2025

    60.8 °F
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