Big Sky Weather Forecast

    • 49
    • 74

    Chance Thunderstorms

    • 45
    • 66

    Rain Showers Likely

    • 47
    • 71

    Chance Thunderstorms

    • 50
    • 74

    Mostly Sunny

    • 51
    • 75

    Partly Sunny

    • 50
    • 76

    Mostly Sunny

    • 50
    • 77

    Mostly Sunny

Today 21 Jul Gallatin and Madison County Mountains and Centennial Mountains

Breezy. Partly cloudy late in the morning then becoming mostly cloudy. A 50 percent chance of Thunderstorms in the afternoon. Highs 70 to 80. South Winds 5 to 15 Mph increasing to southwest 15 to 25 Mph with Gusts to around 40 Mph in the afternoon.

Tonight 21 Jul Gallatin and Madison County Mountains and Centennial Mountains

Mostly cloudy with chance of rain Showers and slight chance of Thunderstorms early in the Evening, then partly cloudy with slight chance of rain Showers after midnight. Lows 45 to 50. Southwest Winds 5 to 15 Mph. Gusts up to 30 Mph early in the evening. Chance of precipitation 40 percent.

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Big Sky Temperature Statistics

July Temperature

Ennis - Big Sky Airport (13.7 miles)

  • Lowest 5 July, 2025

    42.8 °F
  • Average July

    67.3 °F
  • Highest 14 July, 2025

    93.2 °F

Climate (2020–Present)

Ennis - Big Sky Airport (13.7 miles)

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  • Average Low 2020–2025

    31.3 °F
  • Average 2020–2025

    43.7 °F
  • Average High 2020–2025

    55.7 °F
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