Rainbow Lake Weather Forecast

    • 40
    • 58

    Rain Likely

    • 41
    • 45

    Rain Showers Likely

    • 43
    • 53

    Slight Chance Rain

    • 45
    • 60

    Mostly Sunny

    • 43
    • 59

    Partly Sunny

    • 42
    • 55

    Chance Rain

Today 14 Sep Butte/Blackfoot Region

Mostly sunny in the Morning, then mostly cloudy with a 20 percent chance of rain in the afternoon. Highs in the upper 60s to mid 70s.

Tonight 14 Sep Butte/Blackfoot Region

Rain Showers likely and a slight chance of Thunderstorms in the Evening, then a chance of rain after midnight. Chance of precipitation 70 percent. Lows in the upper 30s to mid 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rainbow Lake Temperature Statistics

September Temperature

Butte, Bert Mooney Airport (42.9 miles)

  • Lowest 5 September, 2025

    39.9 °F

  • Average September

    61 °F

  • Highest 3 September, 2025

    88 °F

Climate (2020–Present)

Butte, Bert Mooney Airport (42.9 miles)

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  • Average Low 2020–2025

    27.7 °F

  • Average 2020–2025

    41.7 °F

  • Average High 2020–2025

    55 °F
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