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.
Big Sky Temperature Statistics
July Temperature
Ennis - Big Sky Airport (13.7 miles)
Lowest 5 July, 2025
42.8 °FAverage July
67.3 °FHighest 14 July, 2025
93.2 °F
Climate (2020–Present)
Ennis - Big Sky Airport (13.7 miles)
Average Low 2020–2025
31.3 °FAverage 2020–2025
43.7 °FAverage High 2020–2025
55.7 °F