Grinnell Lake Weather Forecast

    • 28
    • 47

    Increasing Clouds

    • 26
    • 39

    Breezy

    • 26
    • 38

    Partly Sunny

    • 29
    • 46

    Mostly Sunny

    • 30
    • 48

    Mostly Sunny

    • 31
    • 49

    Mostly Sunny

Today 24 Oct Upper San Joaquin River

Sunny. Highs 48 to 62. Southwest Winds up to 10 Mph.

Tonight 24 Oct Upper San Joaquin River

Partly cloudy. Lows 31 to 41. South Winds up to 10 Mph. Gusts up to 25 Mph increasing to 35 Mph after midnight.

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  • Temperature Real-Time

Grinnell Lake Temperature Statistics

October Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 12 October, 2025

    19.4 °F

  • Average October

    45.6 °F

  • Highest 19 October, 2025

    71.6 °F

Climate (2020–Present)

Mammoth Yosemite Airport (10.6 miles)

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  • Average Low 2020–2025

    29.6 °F

  • Average 2020–2025

    46 °F

  • Average High 2020–2025

    60.8 °F
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