Big Sky Weather Forecast

    • 46
    • 78

    Slight Chance Rain Showers

    • 44
    • 72

    Rain Showers

    • 38
    • 50

    Rain Showers

    • 34
    • 46

    Rain Showers Likely

    • 36
    • 53

    Rain Showers Likely

    • 38
    • 59

    Slight Chance Thunderstorms

Today 28 May Gallatin and Madison County Mountains and Centennial Mountains

Warmer, sunny. A 20 percent chance of Thunderstorms late in the afternoon. Highs 71 to 81. Southeast Winds up to 15 Mph with Gusts to around 30 Mph.

Tonight 28 May Gallatin and Madison County Mountains and Centennial Mountains

Partly cloudy. Lows 42 to 50. South Winds up to 10 Mph. Gusts up to 30 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Sky Temperature Statistics

May Temperature

Ennis - Big Sky Airport (13.7 miles)

  • Lowest 6 May, 2026

    19.4 °F

  • Average May

    50.6 °F

  • Highest 13 May, 2026

    84.2 °F

Climate (2021–Present)

Ennis - Big Sky Airport (13.7 miles)

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  • Average Low 2021–2026

    32.1 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    56.6 °F
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