Granite State Park Weather Forecast

    • 32
    • 38

    Rain/Snow

    • 33
    • 46

    Chance Rain

    • 35
    • 51

    Slight Chance Thunderstorms

    • 40
    • 58

    Rain Likely

    • 39
    • 60

    Rain Showers Likely

    • 42
    • 66

    Partly Sunny

Today 31 May Butte/Blackfoot Region

Rain likely. Slight chance of snow early in the Morning, then snow likely late in the morning. Chance of precipitation near 100 percent. No snow accumulation. Highs in the mid 40s to lower 50s.

Tonight 31 May Butte/Blackfoot Region

Rain likely in the Evening, then a chance of rain after midnight. Patchy fog after midnight. Chance of rain 70 percent. Lows in the 30s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Granite State Park Temperature Statistics

May Temperature

Butte, Bert Mooney Airport (43.5 miles)

  • Lowest 19 May, 2026

    19.7 °F

  • Average May

    49.3 °F

  • Highest 28 May, 2026

    82.9 °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

    55.9 °F
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