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Big Sky Weather in September
September in Big Sky brings pleasant temperatures, with daytime highs of 19°C (66°F) and nights around 3°C (37°F). Expect around 46 mm (1.8 in) of rainfall during the month.
Rainfall in Big Sky in September
This month experiences about 12 days of rain according to historical data, averaging 46 mm (1.8 in). Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.
Temperature in Big Sky in September
If you're visiting Big Sky in September, expect highs of 19°C (66°F) and overnight lows around 3°C (37°F). Summer occurs in September. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With overnight lows of 3°C (37°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Big Sky Temperature in September
Min Temperature
3°C (37°F)
Max Temperature
19°C (66°F)
Chance of Rain
39%
Precipitation
46 mm (1.8 in)
Rainy days
12 days
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.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Big Sky in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days.
What To Do in Big Sky in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling10/10 -
Walking10/10 -
Camping5/10 -
Outdoor sports10/10
Big Sky 3-Day Forecast
More climate data for Big Sky
See the full Big Sky climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
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