Grinnell Lake Weather Forecast

    • 30
    • 50

    Mostly Sunny

    • 28
    • 50

    Mostly Sunny

    • 22
    • 46

    Partly Sunny

    • 21
    • 39

    Snow Likely

    • 18
    • 31

    Snow Likely

    • 17
    • 30

    Chance Snow

Today 17 Oct Upper San Joaquin River

Sunny. Highs 51 to 67. Northeast Winds up to 5 Mph shifting to the west in the afternoon.

Tonight 17 Oct Upper San Joaquin River

Clear. Lows 32 to 44. Northeast Winds up to 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Lake Temperature Statistics

October Temperature

Mammoth Yosemite Airport (10.6 miles)

  • Lowest 14 October, 2026

    24.8 °F

  • Average October

    54.4 °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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