Grinnell Lake Weather Forecast

    • 54
    • 74

    Chance Rain Showers

    • 55
    • 77

    Mostly Sunny

    • 58
    • 82

    Mostly Sunny

    • 61
    • 84

    Partly Sunny

    • 60
    • 83

    Chance Rain Showers

    • 57
    • 79

    Chance Thunderstorms

Today 18 Aug Shirley Basin

Mostly cloudy with a chance of Showers. A chance of Thunderstorms in the afternoon. Highs in the upper 70s. West Winds 10 to 15 Mph. Chance of rain 50 percent.

Tonight 18 Aug Shirley Basin

Partly cloudy with a 20 percent chance of Showers. Lows in the mid 50s. West Winds around 5 Mph.

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Grinnell Lake Temperature Statistics

August Temperature

Elk Mountain AWOS (34.8 miles)

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  • Average August

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Climate (2021–2025)

Elk Mountain AWOS (34.8 miles)

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  • Average Low 2021–2025

    34.9 °F

  • Average 2021–2025

    45.4 °F

  • Average High 2021–2025

    55.9 °F
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