Big Sky Weather Forecast

    • 54
    • 77

    Slight Chance Thunderstorms

    • 55
    • 79

    Slight Chance Thunderstorms

    • 53
    • 78

    Slight Chance Thunderstorms

    • 55
    • 81

    Mostly Sunny

    • 56
    • 83

    Mostly Sunny

    • 56
    • 87

    Mostly Sunny

Today 27 Jul Gallatin and Madison County Mountains and Centennial Mountains

Partly sunny. Patchy smoke until late afternoon. Slight chance of rain Showers early in the morning. Slight chance of Thunderstorms late in the afternoon. Highs 73 to 83. South Winds up to 5 Mph with Gusts to around 20 Mph shifting to the southwest 5 to 15 Mph with Gusts to around 30 Mph in the afternoon. Chance of precipitation 20 percent.

Tonight 27 Jul Gallatin and Madison County Mountains and Centennial Mountains

Partly cloudy. A 20 percent chance of Thunderstorms in the evening. Patchy smoke after midnight. Lows 51 to 57. South Winds up to 10 Mph with Gusts to around 25 Mph.

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Big Sky Temperature Statistics

July Temperature

Ennis - Big Sky Airport (13.7 miles)

  • Lowest 1 July, 2026

    41 °F
  • Average July

    68.9 °F
  • Highest 12 July, 2026

    98.6 °F

Climate (2021–2026)

Ennis - Big Sky Airport (13.7 miles)

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  • Average Low 2021–2026

    32 °F
  • Average 2021–2026

    44.4 °F
  • Average High 2021–2026

    56.3 °F
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