Big Sky Weather Forecast

    • 36
    • 67

    Mostly Sunny

    • 39
    • 55

    Mostly Cloudy

    • 38
    • 56

    Chance Rain

    • 35
    • 52

    Chance Rain Showers

    • 37
    • 55

    Partly Sunny

    • 36
    • 56

    Partly Sunny

Today 25 Sep Gallatin and Madison County Mountains and Centennial Mountains

Breezy, sunny. Highs 60 to 72. South Winds 10 to 25 Mph with Gusts to around 45 Mph.

Tonight 25 Sep Gallatin and Madison County Mountains and Centennial Mountains

Breezy. Partly cloudy. Lows in the mid 30s. Southwest Winds 10 to 25 Mph with Gusts to around 50 Mph decreasing to 5 to 10 Mph with Gusts to around 35 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Sky Temperature Statistics

September Temperature

Ennis - Big Sky Airport (13.7 miles)

  • Lowest 15 September, 2026

    30.2 °F

  • Average September

    57.5 °F

  • Highest 6 September, 2026

    82.4 °F

Climate (2021–2026)

Ennis - Big Sky Airport (13.7 miles)

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

  • Average Low 2021–2026

    32.1 °F

  • Average 2021–2026

    44.5 °F

  • Average High 2021–2026

    56.5 °F
Get WillyWeather+ to remove ads