Grinnell Lake Weather Forecast

    • 25
    • 39

    Chance Snow

    • 21
    • 31

    Chance Snow

    • 22
    • 31

    Snow

    • 17
    • 27

    Partly Sunny

    • 25
    • 39

    Partly Sunny

    • 23
    • 40

    Partly Sunny

    • 22
    • 38

    Partly Sunny

Today 29 Oct Upper San Joaquin River

Sunny. Highs 37 to 51.

Tonight 29 Oct Upper San Joaquin River

Snow likely in the late evening and overnight. Chance of rain after Midnight, then rain likely late in the night. Snow accumulation up to 1 inch. Snow level 7800 feet. Near steady temperature in the mid 30s. South Winds up to 10 Mph with Gusts to around 40 Mph. Chance of precipitation 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

October Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 25 October, 2026

    19.4 °F

  • Average October

    49.3 °F

  • Highest 1 October, 2026

    78.8 °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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