Big Sky, MT Weather & Growing Conditions
This Afternoon
43°F
Showers And Thunderstorms
Showers and thunderstorms before 5pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 43. North wind around 7 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 43°F | Showers And Thunderstorms | 7 mph N | 96% |
| Tonight | 38°F | Chance Showers And Thunderstorms then Chance Light Rain | 2 to 7 mph N | 54% |
| Sunday | 50°F | Partly Sunny | 3 to 8 mph N | 11% |
| Sunday Night | 35°F | Partly Cloudy | 6 mph S | 4% |
| Monday | 58°F | Sunny | 6 mph SSW | 5% |
| Monday Night | 38°F | Mostly Clear | 3 to 7 mph SW | 0% |
| Tuesday | 60°F | Mostly Sunny | 8 mph SSW | 1% |
| Tuesday Night | 41°F | Partly Cloudy | 7 mph SSW | 11% |
| Wednesday | 59°F | Mostly Sunny | 7 to 10 mph SSW | 9% |
| Wednesday Night | 40°F | Mostly Clear | 10 mph SSW | 5% |
| Thursday | 61°F | Sunny | 13 mph S | 1% |
| Thursday Night | 42°F | Mostly Clear | 12 mph S | 2% |
| Friday | 62°F | Mostly Sunny | 9 to 14 mph SSW | 2% |
| Friday Night | 41°F | Partly Cloudy | 12 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
5a
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 (10.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.