Whetstone Lake Weather Forecast

    • 47
    • 75

    Slight Chance Thunderstorms

    • 47
    • 72

    Mostly Sunny

    • 46
    • 74

    Mostly Sunny

    • 48
    • 77

    Partly Sunny

    • 51
    • 76

    Mostly Cloudy

    • 50
    • 74

    Partly Sunny

Today 20 Aug Bitterroot/Sapphire Mountains

Mostly sunny. Slight chance of rain early in the afternoon. Slight chance of Showers and Thunderstorms late in the afternoon. Chance of precipitation 20 percent. Highs in the upper 70s to mid 80s.

Tonight 20 Aug Bitterroot/Sapphire Mountains

Mostly clear. Areas of smoke in the evening. Lows in the mid 40s to lower 50s. West Winds to 15 Mph.

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Whetstone Lake Temperature Statistics

August Temperature

Butte, Bert Mooney Airport (54.1 miles)

  • Lowest 9 August, 2025

    39.7 °F

  • Average August

    62.9 °F

  • Highest 12 August, 2025

    87.7 °F

Climate (2020–Present)

Butte, Bert Mooney Airport (54.1 miles)

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  • Average Low 2020–2025

    27.7 °F

  • Average 2020–2025

    41.6 °F

  • Average High 2020–2025

    55 °F
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