Grinnell Lake Weather Forecast

    • 46
    • 65

    Becoming Sunny

    • 50
    • 70

    Partly Sunny

    • 48
    • 70

    Partly Sunny

    • 46
    • 68

    Mostly Sunny

    • 41
    • 62

    Sunny

    • 43
    • 67

    Mostly Sunny

Today 18 Sep Shirley Basin

Mostly sunny. Warmer with Highs in the mid 60s. West Winds 5 to 10 Mph.

Tonight 18 Sep Shirley Basin

Mostly clear. Lows in the upper 30s. Southwest Winds 5 to 10 Mph.

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Grinnell Lake Temperature Statistics

September Temperature

Elk Mountain AWOS (34.8 miles)

  • Lowest 5 September, 2025

    35.6 °F

  • Average September

    60.5 °F

  • Highest 10 September, 2025

    82.4 °F

Climate (2020–Present)

Elk Mountain AWOS (34.8 miles)

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  • Average Low 2020–2025

    33.9 °F

  • Average 2020–2025

    44.5 °F

  • Average High 2020–2025

    54.8 °F
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