Three Island Lake Weather Forecast

    • 43
    • 58

    Becoming Sunny

    • 44
    • 60

    Mostly Sunny

    • 44
    • 59

    Partly Sunny

    • 41
    • 55

    Chance Rain

    • 37
    • 54

    Mostly Sunny

    • 37
    • 55

    Mostly Sunny

Today 25 Aug Upper San Joaquin River

Sunny. Highs 63 to 79. Southwest Winds up to 15 Mph with Gusts to around 30 Mph.

Tonight 25 Aug Upper San Joaquin River

Partly cloudy. Lows 46 to 58. Southwest Winds up to 10 Mph with Gusts to around 25 Mph shifting to the southeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Three Island Lake Temperature Statistics

August Temperature

Mammoth Yosemite Airport (23 miles)

  • Lowest 14 August, 2026

    35.6 °F

  • Average August

    68.4 °F

  • Highest 1 August, 2026

    91.4 °F

Climate (2021–2026)

Mammoth Yosemite Airport (23 miles)

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  • Average Low 2021–2026

    29.5 °F

  • Average 2021–2026

    45.8 °F

  • Average High 2021–2026

    60.6 °F
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