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.
Big Sky Temperature Statistics
July Temperature
Ennis - Big Sky Airport (13.7 miles)
Lowest 1 July, 2026
41 °FAverage July
68.9 °FHighest 12 July, 2026
98.6 °F
Climate (2021–2026)
Ennis - Big Sky Airport (13.7 miles)
Average Low 2021–2026
32 °FAverage 2021–2026
44.4 °FAverage High 2021–2026
56.3 °F