Grinnell Lake Weather Forecast

    • 20
    • 34

    Sunny

    • 23
    • 38

    Mostly Sunny

    • 23
    • 39

    Sunny

    • 20
    • 39

    Sunny

    • 20
    • 37

    Sunny

    • 21
    • 40

    Mostly Sunny

Today 12 Jan Upper San Joaquin River

Sunny. Highs 35 to 49. Northeast Winds 5 to 15 Mph.

Tonight 12 Jan Upper San Joaquin River

Clear. Near steady temperature in the lower 30s. Northeast Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

January Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 10 January, 2026

    -2.2 °F

  • Average January

    22.2 °F

  • Highest 3 January, 2026

    39.2 °F

Climate (2021–Present)

Mammoth Yosemite Airport (10.6 miles)

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  • Average Low 2021–2026

    29.6 °F

  • Average 2021–2026

    45.9 °F

  • Average High 2021–2026

    60.8 °F
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