Deep Lake Weather Forecast
- 40
- 56
Becoming Sunny
- 44
- 62
Mostly Sunny
- 44
- 63
Partly Sunny
- 44
- 64
Partly Sunny
- 39
- 60
Mostly Sunny
- 44
- 60
Mostly Sunny
Today 17 Sep Gallatin and Madison County Mountains and Centennial Mountains
Sunny. Highs 55 to 65. Northeast Winds up to 10 Mph.
Tonight 17 Sep Gallatin and Madison County Mountains and Centennial Mountains
Mostly clear. Lows 35 to 45. Northeast Winds up to 10 Mph shifting to the east after midnight.
Deep Lake Temperature Statistics
September Temperature
Ennis - Big Sky Airport (28 miles)
Lowest 5 September, 2025
39.2 °FAverage September
60.9 °FHighest 2 September, 2025
87.8 °F
Climate (2020–Present)
Ennis - Big Sky Airport (28 miles)
Average Low 2020–2025
31.3 °FAverage 2020–2025
43.7 °FAverage High 2020–2025
55.7 °F