Grinnell Lake Weather Forecast

    • 32
    • 52

    Mostly Sunny

    • 26
    • 51

    Mostly Sunny

    • 30
    • 45

    Partly Sunny

    • 29
    • 46

    Slight Chance Snow

    • 27
    • 39

    Partly Sunny

    • 28
    • 41

    Partly Sunny

Today 13 Dec Upper San Joaquin River

Sunny. Highs 50 to 64. South Winds up to 5 Mph.

Tonight 13 Dec Upper San Joaquin River

Mostly clear. Lows 34 to 48. Southeast Winds up to 10 Mph.

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Grinnell Lake Temperature Statistics

December Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 4 December, 2025

    10.4 °F

  • Average December

    35.2 °F

  • Highest 9 December, 2025

    62.6 °F

Climate (2020–Present)

Mammoth Yosemite Airport (10.6 miles)

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  • Average Low 2020–2025

    29.6 °F

  • Average 2020–2025

    45.9 °F

  • Average High 2020–2025

    60.8 °F
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