Big Sky Weather Forecast

    • 55
    • 75

    Chance Thunderstorms

    • 57
    • 80

    Slight Chance Thunderstorms

    • 56
    • 82

    Chance Thunderstorms

    • 56
    • 81

    Partly Sunny

    • 54
    • 80

    Slight Chance Thunderstorms

    • 54
    • 79

    Mostly Sunny

Today 23 Jul Gallatin and Madison County Mountains and Centennial Mountains

Mostly sunny. Patchy fog early in the morning. Patchy smoke in the afternoon. A 50 percent chance of Thunderstorms in the afternoon. Highs 70 to 80. West Winds up to 10 Mph.

Tonight 23 Jul Gallatin and Madison County Mountains and Centennial Mountains

Partly cloudy. A 30 percent chance of Thunderstorms in the evening. Patchy smoke through the night. Lows 52 to 60. Southwest Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Sky Temperature Statistics

July Temperature

Ennis - Big Sky Airport (13.7 miles)

  • Lowest 1 July, 2026

    41 °F

  • Average July

    68.2 °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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