Grinnell Lake Weather Forecast

    • 26
    • 42

    Slight Chance Snow

    • 25
    • 38

    Snow

    • 21
    • 31

    Snow Showers

    • 19
    • 36

    Mostly Sunny

    • 23
    • 40

    Mostly Sunny

    • 23
    • 41

    Mostly Sunny

Today 20 Oct Upper San Joaquin River

Sunny in the Morning, then partly sunny with chance of snow and slight chance of rain in the afternoon. Highs 42 to 58. South Winds up to 10 Mph. Chance of precipitation 50 percent.

Tonight 20 Oct Upper San Joaquin River

Partly cloudy with slight chance of rain and snow in the Evening, then mostly cloudy with chance of rain after midnight. Lows 29 to 41. Southeast Winds up to 10 Mph. Chance of precipitation 50 percent.

Graph Plots Open in Graphs

  • 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

    52.9 °F

  • Highest 1 October, 2026

    78.8 °F

Climate (2021–2026)

Mammoth Yosemite Airport (10.6 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    29.5 °F

  • Average 2021–2026

    45.8 °F

  • Average High 2021–2026

    60.6 °F
Get WillyWeather+ to remove ads