Rat Lake Weather Forecast

    • 38
    • 61

    Gradual Clearing

    • 41
    • 69

    Mostly Sunny

    • 46
    • 72

    Partly Sunny

    • 46
    • 72

    Partly Sunny

    • 47
    • 74

    Mostly Sunny

    • 45
    • 74

    Partly Sunny

Today 20 Sep Gallatin and Madison County Mountains and Centennial Mountains

Mostly cloudy. A 20 percent chance of rain. Lows 36 to 42. Highs 53 to 63.

Tonight 20 Sep Gallatin and Madison County Mountains and Centennial Mountains

Partly cloudy. A 20 percent chance of rain. Patchy fog early in the morning. Highs 50 to 60. Lows 33 to 42. South Winds up to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Rat Lake Temperature Statistics

September Temperature

Ennis - Big Sky Airport (24.9 miles)

  • Lowest 15 September, 2026

    30.2 °F

  • Average September

    58.3 °F

  • Highest 6 September, 2026

    82.4 °F

Climate (2021–2026)

Ennis - Big Sky Airport (24.9 miles)

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

  • Average Low 2021–2026

    32 °F

  • Average 2021–2026

    44.4 °F

  • Average High 2021–2026

    56.4 °F
Get WillyWeather+ to remove ads