Grinnell Lake Weather Forecast

    • 26
    • 41

    Breezy

    • 23
    • 43

    Mostly Sunny

    • 25
    • 41

    Mostly Cloudy

    • 22
    • 38

    Chance Snow

    • 18
    • 33

    Chance Snow

    • 17
    • 30

    Chance Snow

Today 26 Oct Upper San Joaquin River

Not as cool. Mostly sunny. Highs 34 to 48.

Tonight 26 Oct Upper San Joaquin River

Clear. Lows 27 to 37. Southwest Winds up to 10 Mph with Gusts to around 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

October Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 18 October, 2026

    23 °F

  • Average October

    50.2 °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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