Big Sky, MT Weather & Growing Conditions
Today
46°F
Mostly Sunny
Mostly sunny. High near 46, with temperatures falling to around 40 in the afternoon. Southeast wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 46°F | Mostly Sunny | 1 mph SE | 0% |
| Tonight | 25°F | Mostly Clear | 1 to 5 mph SSW | 0% |
| Thursday | 40°F | Partly Sunny then Chance Light Snow | 5 mph SSW | 29% |
| Thursday Night | 23°F | Chance Light Snow | 3 mph SSW | 29% |
| Friday | 41°F | Sunny | 5 mph SSW | 0% |
| Friday Night | 26°F | Partly Cloudy | 3 to 8 mph SSW | 0% |
| Saturday | 48°F | Sunny | 1 to 5 mph SSW | 0% |
| Saturday Night | 30°F | Partly Cloudy | 5 to 9 mph S | 0% |
| Sunday | 50°F | Mostly Sunny | 9 mph S | 1% |
| Sunday Night | 30°F | Partly Cloudy | 3 to 10 mph SSW | 1% |
| Monday | 48°F | Mostly Sunny | 5 mph SSW | 2% |
| Monday Night | 32°F | Mostly Cloudy | 7 mph S | 2% |
| Tuesday | 48°F | Mostly Sunny | 6 mph SW | 4% |
| Tuesday Night | 32°F | Partly Cloudy | 7 mph SSW | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Big Sky, MT
Growing season
50 days
Hardiness zone
4b
Explore more for Big Sky, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Big Sky 2Wnw, Mt (3.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.