Grinnell Lake Weather Forecast

    • 19
    • 41

    Chance Snow

    • 17
    • 30

    Snow

    • 19
    • 35

    Mostly Sunny

    • 24
    • 43

    Mostly Sunny

    • 25
    • 45

    Sunny

    • 27
    • 47

    Sunny

Today 11 Oct Upper San Joaquin River

Partly sunny. Chance of snow early in the Morning, then chance of rain and snow in the late morning and afternoon. Highs 40 to 56. Southwest Winds 5 to 10 Mph with Gusts to around 35 Mph increasing to 10 to 20 Mph with Gusts to around 45 Mph in the afternoon. Chance of precipitation 50 percent.

Tonight 11 Oct Upper San Joaquin River

Colder. Partly cloudy with a 20 percent chance of rain and snow. Lows 22 to 34. South Winds 15 to 20 Mph with Gusts to around 45 Mph decreasing to up to 10 Mph with Gusts to around 30 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

October Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 1 October, 2026

    32 °F

  • Average October

    60 °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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