Three Island Lake Weather Forecast

    • 34
    • 49

    Mostly Sunny

    • 37
    • 51

    Mostly Sunny

    • 38
    • 54

    Mostly Sunny

    • 38
    • 54

    Mostly Sunny

    • 38
    • 54

    Mostly Sunny

    • 36
    • 51

    Slight Chance Rain/Snow

Today 13 Sep Upper San Joaquin River

Warmer, sunny. Highs 54 to 68. East Winds up to 10 Mph shifting to the southwest with Gusts to around 25 Mph in the afternoon.

Tonight 13 Sep Upper San Joaquin River

Mostly clear. Lows 37 to 47. South Winds up to 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Three Island Lake Temperature Statistics

September Temperature

Mammoth Yosemite Airport (23 miles)

  • Lowest 7 September, 2025

    35.6 °F

  • Average September

    58.1 °F

  • Highest 1 September, 2025

    80.6 °F

Climate (2020–Present)

Mammoth Yosemite Airport (23 miles)

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  • Average Low 2020–2025

    29.7 °F

  • Average 2020–2025

    46.2 °F

  • Average High 2020–2025

    61 °F
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