Granite State Park Weather Forecast

    • 40
    • 63

    Gradual Clearing

    • 36
    • 59

    Mostly Sunny

    • 44
    • 68

    Partly Sunny

    • 41
    • 67

    Chance Rain

    • 38
    • 59

    Chance Rain

    • 35
    • 57

    Chance Rain/Snow

Today 10 May Butte/Blackfoot Region

Partly cloudy. Highs in the 70s. West Winds to 15 Mph in the afternoon.

Tonight 10 May Butte/Blackfoot Region

Mostly cloudy in the evening then becoming partly cloudy. Lows in the 40s. West Winds to 15 Mph.

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  • Temperature Real-Time

Granite State Park Temperature Statistics

May Temperature

Butte, Bert Mooney Airport (43.5 miles)

  • Lowest 6 May, 2026

    22.6 °F

  • Average May

    47 °F

  • Highest 3 May, 2026

    70.6 °F

Climate (2021–Present)

Butte, Bert Mooney Airport (43.5 miles)

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  • Average Low 2021–2026

    28.5 °F

  • Average 2021–2026

    42.4 °F

  • Average High 2021–2026

    55.7 °F
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