Ennis - Big Sky Airport Weather Forecast

    • 39
    • 72

    Increasing Clouds

    • 41
    • 73

    Slight Chance Rain Showers

    • 37
    • 68

    Chance Rain Showers

    • 35
    • 63

    Partly Sunny

    • 38
    • 69

    Mostly Sunny

    • 39
    • 66

    Mostly Sunny

Today 11 Sep Madison River Valley

Sunny late in the morning then becoming partly sunny. Highs 67 to 73. Northwest Winds up to 15 Mph.

Tonight 11 Sep Madison River Valley

Colder. Mostly cloudy. Areas of fog after midnight. Lows 38 to 44. North Winds 10 to 15 Mph decreasing to up to 5 Mph after midnight. Gusts up to 35 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ennis - Big Sky Airport Temperature Statistics

September Temperature

Ennis - Big Sky Airport (0 miles)

  • Lowest 8 September, 2026

    33.8 °F

  • Average September

    60.3 °F

  • Highest 6 September, 2026

    82.4 °F

Climate (2021–2026)

Ennis - Big Sky Airport (0 miles)

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  • Average Low 2021–2026

    32 °F

  • Average 2021–2026

    44.4 °F

  • Average High 2021–2026

    56.4 °F
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