Big Sky, MT Weather & Growing Conditions
Tonight
39°F
Chance Showers And Thunderstorms then Chance Light Rain
A chance of showers and thunderstorms before 9pm, then a chance of rain between 9pm and midnight, then a chance of rain and patchy fog between midnight and 2am, then patchy fog and a slight chance of rain. Mostly cloudy, with a low around 39. West northwest wind around 2 mph. Chance of precipitation is 40%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 39°F | Chance Showers And Thunderstorms then Chance Light Rain | 2 mph WNW | 44% |
| Sunday | 56°F | Areas Of Fog then Partly Sunny | 0 to 5 mph WNW | 7% |
| Sunday Night | 39°F | Partly Cloudy | 2 mph S | 3% |
| Monday | 63°F | Sunny | 3 mph SW | 2% |
| Monday Night | 42°F | Mostly Clear | 3 mph S | 0% |
| Tuesday | 65°F | Sunny | 3 mph SSW | 1% |
| Tuesday Night | 45°F | Partly Cloudy | 5 mph S | 7% |
| Wednesday | 64°F | Mostly Sunny | 3 to 7 mph SSW | 8% |
| Wednesday Night | 44°F | Partly Cloudy | 7 mph SSW | 7% |
| Thursday | 67°F | Sunny | 8 mph SSW | 1% |
| Thursday Night | 46°F | Partly Cloudy | 6 to 10 mph S | 1% |
| Friday | 67°F | Mostly Sunny | 7 to 10 mph S | 3% |
| Friday Night | 44°F | Partly Cloudy | 8 mph S | 8% |
| Saturday | 62°F | Partly Sunny then Slight Chance Light Rain | 7 mph SSW | 24% |
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 Sep 20, 2026.