Grinnell Lake Weather Forecast

    • 30
    • 50

    Mostly Sunny

    • 32
    • 48

    Mostly Sunny

    • 32
    • 50

    Mostly Sunny

    • 32
    • 50

    Mostly Sunny

    • 35
    • 51

    Slight Chance Thunderstorms

    • 34
    • 49

    Slight Chance Thunderstorms

    • 36
    • 51

    Chance Rain Showers

Today 1 Sep Upper San Joaquin River

Sunny. Highs 50 to 64. Southwest Winds 5 to 15 Mph with Gusts to around 40 Mph.

Tonight 1 Sep Upper San Joaquin River

Mostly clear. Lows 32 to 42. Southwest Winds 5 to 20 Mph with Gusts to around 45 Mph.

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Grinnell Lake Temperature Statistics

September Temperature

Mammoth Yosemite Airport (10.6 miles)

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  • Average September

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Climate (2021–2026)

Mammoth Yosemite Airport (10.6 miles)

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  • Average Low 2021–2026

    29.5 °F

  • Average 2021–2026

    45.7 °F

  • Average High 2021–2026

    60.6 °F
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