When to go · Big Sky
Big Sky in September
Great month. Inside Big Sky's best window: Dec–Mar (ski), Jun–Sep (hiking, rafting, Yellowstone).
Key facts
- Verdict
- Great
- Temperature
- 21°C (70°F)70°F (21°C) / 3°C (37°F)37°F (3°C)
- average high / low
- Rain days
- 8
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Inside Big Sky's best window: Dec–Mar (ski), Jun–Sep (hiking, rafting, Yellowstone).
Is another month better than September?
No other month rates higher than September for Big Sky in this guide.
Weather in September
- Big SkyHighs around 21 °C (70 °F), lows around 3 °C (37 °F), rain on about 8 daysHighs around 70 °F (21 °C), lows around 37 °F (3 °C), rain on about 8 days
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Labor Day big impact
1st Monday of September · United States
End of summer; last big road-trip weekend.
Crowds and prices
- Crowds · United States overall
- Medium
- Prices · United States overall
- Medium
United States overall: After Labor Day the crowds drop and parks stay open; Florida and the Gulf are at hurricane peak.
Compare two months
Weather, crowds and prices for any two months in Big Sky, side by side.
Verdict
Sep: Great
Jan: Great
Daytime high
Sep: 21 °C (70 °F)70 °F (21 °C)
Jan: -2 °C (28 °F)28 °F (-2 °C)
Night low
Sep: 3 °C (37 °F)37 °F (3 °C)
Jan: -13 °C (9 °F)9 °F (-13 °C)
Rain days
Sep: 8 (better)
Jan: 10
Crowds
Sep: Medium
Jan: Low
Prices
Sep: Medium
Jan: Low
Festivals listed
Sep: 1
Jan: 0
September: Inside Big Sky's best window: Dec–Mar (ski), Jun–Sep (hiking, rafting, Yellowstone).
January: Inside Big Sky's best window: Dec–Mar (ski), Jun–Sep (hiking, rafting, Yellowstone).
Big Sky: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm coat, hat and gloves for mornings and evenings