Rainbow Lake Weather Forecast

    • 37
    • 52

    Decreasing Clouds

    • 34
    • 51

    Chance Snow

    • 32
    • 42

    Partly Sunny

    • 35
    • 49

    Slight Chance Rain

    • 37
    • 48

    Mostly Sunny

    • 41
    • 55

    Mostly Sunny

    • 44
    • 57

    Mostly Sunny

Today 12 Sep Butte/Blackfoot Region

Mostly cloudy. Patchy fog early in the morning. Highs in the 60s.

Tonight 12 Sep Butte/Blackfoot Region

Mostly cloudy then becoming partly cloudy in the late evening and early morning then becoming mostly cloudy. Lows in the mid 30s to lower 40s.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Rainbow Lake Temperature Statistics

September Temperature

Butte, Bert Mooney Airport (42.9 miles)

  • Lowest 9 September, 2026

    32 °F

  • Average September

    56.7 °F

  • Highest 1 September, 2026

    79.6 °F

Climate (2021–2026)

Butte, Bert Mooney Airport (42.9 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    28.5 °F

  • Average 2021–2026

    42.3 °F

  • Average High 2021–2026

    55.7 °F
Get WillyWeather+ to remove ads