Granite State Park Weather Forecast

    • 30
    • 52

    Chance Rain/Snow

    • 29
    • 43

    Slight Chance Rain/Snow

    • 33
    • 53

    Partly Sunny

    • 35
    • 53

    Mostly Sunny

    • 39
    • 60

    Mostly Sunny

    • 37
    • 55

    Mostly Sunny

    • 37
    • 56

    Mostly Sunny

Today 13 Sep Butte/Blackfoot Region

Partly cloudy. Chance of rain Showers and a slight chance of Thunderstorms in the afternoon. Chance of precipitation 50 percent. Highs in the 60s. West Winds 15 to 20 Mph with Gusts to around 30 Mph in the afternoon.

Tonight 13 Sep Butte/Blackfoot Region

Mostly cloudy with a 50 percent chance of rain Showers. Lows in the 30s. Northwest Winds to 15 Mph with Gusts to around 30 Mph shifting to the southwest after midnight.

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Granite State Park Temperature Statistics

September Temperature

Butte, Bert Mooney Airport (43.5 miles)

  • Lowest 9 September, 2026

    31.6 °F

  • Average September

    56.3 °F

  • Highest 1 September, 2026

    79.6 °F

Climate (2021–2026)

Butte, Bert Mooney Airport (43.5 miles)

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  • Average Low 2021–2026

    28.5 °F

  • Average 2021–2026

    42.3 °F

  • Average High 2021–2026

    55.7 °F
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