Twin Island Lakes Weather Forecast

    • 39
    • 59

    Becoming Sunny

    • 35
    • 55

    Mostly Sunny

    • 36
    • 58

    Mostly Sunny

    • 36
    • 56

    Mostly Sunny

    • 38
    • 57

    Mostly Sunny

    • 40
    • 59

    Mostly Sunny

Today 12 Sep Upper San Joaquin River

Sunny. Highs 59 to 73. Southwest Winds 5 to 15 Mph with Gusts to around 35 Mph.

Tonight 12 Sep Upper San Joaquin River

Clear. Lows 39 to 49. South Winds 5 to 15 Mph with Gusts to around 45 Mph.

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  • Temperature Real-Time

Twin Island Lakes Temperature Statistics

September Temperature

Mammoth Yosemite Airport (21.7 miles)

  • Lowest 5 September, 2026

    33.8 °F

  • Average September

    59.6 °F

  • Highest 9 September, 2026

    84.2 °F

Climate (2021–2026)

Mammoth Yosemite Airport (21.7 miles)

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  • Average Low 2021–2026

    29.4 °F

  • Average 2021–2026

    45.7 °F

  • Average High 2021–2026

    60.5 °F
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