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Big Sky (MT) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Big Sky.
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Climate overview of Big Sky
Big Sky, Montana, United States of America, sees big temperature differences between seasons, with July peaking at 24°C (75°F) and December dropping to -3°C (27°F).
With around 716 mm (28 in) of annual rain/snowfall, the city has moderate precipitation levels. May is the wettest month and July the driest. It also has warm summers and very cold winters.
Big Sky Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Big Sky - and find the best time to visit.
Monthly Temperature in Big Sky
Visitors to Big Sky can expect significant temperature changes throughout the year. Typically, average maximum daytime temperatures range from a comfortable 24°C (75°F) in July to a very cold -3°C (27°F) in the coolest month, December.
Nights vary from 7°C (45°F) in July to around -13°C (9°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Big Sky
Generally, Big Sky experiences moderate precipitation patterns, averaging 716 mm (28 in) yearly. Big Sky offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month May (92 mm (3.6 in)) and the driest month July (45 mm (1.8 in)) is not too significant. For more details, please visit our Big Sky Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Big Sky
The most comfortable overall weather for exploring Big Sky is usually found in July and August. Conditions are generally least comfortable in January, February, March, April, October, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
very cold
Feb
cold
Mar
cold
Apr
cold
May
mixed
Jun
very good
Jul
excellent
Aug
excellent
Sep
very good
Oct
cold
Nov
cold
Dec
very cold
- Best overall: July and August
- Warmest weather: July and August
- Fewest rainy days: July, August and September
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: December, with freezing nights around -13°C (9°F).
Frequently asked questions about the climate in Big Sky
What is the best time to visit Big Sky?
July and August typically offer the most optimal weather in Big Sky. In contrast, January, February, March, April, October, November and December tend to have less optimal conditions. Big Sky has warm summers and very cold winters.
What temperatures can I expect in Big Sky?
Daytime highs range from -3°C (27°F) in December to 24°C (75°F) in July. Nighttime lows range from -13°C (9°F) to 7°C (45°F). Temperatures vary considerably through the year.
How much rain does Big Sky get?
Annual rainfall is around 716 mm (28 in). May is the wettest month with 92 mm (3.6 in), while July is the driest with 45 mm (1.8 in).
Big Sky 3-Day Forecast
Big Sky on the map
Big Sky is highlighted - select any city to see its climate.
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