Grinnell Lake Weather Forecast

    • 14
    • 28

    Becoming Sunny

    • 18
    • 32

    Partly Sunny

    • 17
    • 33

    Partly Sunny

    • 22
    • 36

    Mostly Sunny

    • 24
    • 39

    Mostly Cloudy

    • 23
    • 39

    Mostly Cloudy

Today 26 Jan Upper San Joaquin River

Sunny. Highs 28 to 44. Southwest Winds up to 10 Mph.

Tonight 26 Jan Upper San Joaquin River

Mostly clear. Lows 16 to 28. Southeast Winds up to 10 Mph.

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  • Temperature Real-Time

Grinnell Lake Temperature Statistics

January Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 10 January, 2026

    -2.2 °F

  • Average January

    22.4 °F

  • Highest 22 January, 2026

    41 °F

Climate (2021–Present)

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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