Thousand Island Lake Weather Forecast

    • 43
    • 63

    Mostly Sunny

    • 44
    • 64

    Partly Sunny

    • 41
    • 58

    Chance Rain

    • 38
    • 52

    Chance Rain Showers

    • 39
    • 55

    Chance Rain Showers

    • 41
    • 58

    Mostly Sunny

Today 16 Sep Upper San Joaquin River

Sunny. Highs 59 to 75. Southeast Winds up to 10 Mph shifting to the southwest in the afternoon.

Tonight 16 Sep Upper San Joaquin River

Mostly clear. Lows 42 to 54. North Winds up to 10 Mph shifting to the northeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Thousand Island Lake Temperature Statistics

September Temperature

Mammoth Yosemite Airport (19.3 miles)

  • Lowest 7 September, 2025

    35.6 °F

  • Average September

    57.4 °F

  • Highest 1 September, 2025

    80.6 °F

Climate (2020–Present)

Mammoth Yosemite Airport (19.3 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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