Grinnell Lake Weather Forecast

    • 44
    • 64

    Becoming Sunny

    • 45
    • 63

    Mostly Cloudy

    • 40
    • 54

    Chance Rain Showers

    • 36
    • 56

    Slight Chance Thunderstorms

    • 36
    • 57

    Mostly Sunny

    • 33
    • 56

    Mostly Sunny

    • 35
    • 54

    Mostly Sunny

Today 26 Aug Upper San Joaquin River

Sunny. Highs 65 to 81. Southwest Winds up to 15 Mph. Gusts up to 30 Mph in the afternoon.

Tonight 26 Aug Upper San Joaquin River

Clear. Lows 46 to 58. Southwest Winds up to 10 Mph with Gusts to around 25 Mph shifting to the south after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

August Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 14 August, 2026

    35.6 °F

  • Average August

    68.5 °F

  • Highest 1 August, 2026

    91.4 °F

Climate (2021–2026)

Mammoth Yosemite Airport (10.6 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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