Grinnell Lake Weather Forecast

    • 28
    • 48

    Mostly Sunny

    • 29
    • 46

    Breezy

    • 29
    • 49

    Sunny

    • 29
    • 49

    Mostly Sunny

    • 27
    • 48

    Mostly Sunny

    • 22
    • 44

    Partly Sunny

Today 14 Oct Upper San Joaquin River

Warmer, sunny. Highs 49 to 65. North Winds up to 10 Mph with Gusts to around 25 Mph.

Tonight 14 Oct Upper San Joaquin River

Clear. Lows 32 to 44. Northeast Winds 5 to 15 Mph with Gusts to around 40 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

October Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 12 October, 2026

    30.2 °F

  • Average October

    57.1 °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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