SeasonMapBig Sky weather in August
United States
August in Big Sky: nice, a little rain, with clean air — one of the weakest months to visit.
#12 of 12 months in Big Sky · #1369 of 1383 destinations to visit in August · comfort 12/100 (tier F)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Big Sky in August
Other months in Big Sky
Big Sky's forum calls February prime powder season — deep base depth, frequent storms, and, outside the Presidents Day weekend crush, thinner crowds than the holidays. Regulars say conditions generally hold up well into March, so it's not a narrow window.
Add your own note from Big Sky's card on the map.
Big Sky climate normals — August
| Daytime high | 24°C / 76°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 53°F | |
| Feels like (high) | 23°C / 73°F | |
| Rainfall | 50 mm / 2 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 54% | 🍃 comfortable |
| Dew point | 7°C / 45°F | |
| Sunshine | 12.1 h/day | |
| Daylight | 14 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Big Sky in August
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusySummer break in United States, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Big Sky's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherBig Sky's weather peaks December–February.
Best weatherFair weatherToughest weather
What's on in Big Sky in August
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Opening
Yellowstone roads open
15 Apr – 5 Nov · usuallyTrail seasonClosuresThe interior roads out of West Yellowstone are ploughed open in stages from mid-April and close again to cars in early November, after which it is snowcoach or nothing. Big Sky is an hour from that gate. Source ↗
- Festival
Music in the Mountains
1 Jun – 10 Sep · usuallyMajor festivalFree Thursday-evening concerts in Town Center park from early June to the start of September. Bring a blanket and something warm; the temperature drops the moment the sun goes behind Lone Peak. Source ↗
Nearby, and something's on
Within 300 km of Big Sky — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Big Sky?
Big Sky in August — FAQ
- Is August a good time to visit Big Sky?
- August in Big Sky: nice, a little rain, with clean air — one of the weakest months to visit. It ranks #12 of 12 months for Big Sky on SeasonMap's comfort score (12/100).
- What is the weather like in Big Sky in August?
- In August, Big Sky averages a daily high of 24.4°C and a low of 11.4°C, with about 50.4 mm of rain over roughly 10.4 rainy days.
- What is the air quality in Big Sky in August?
- Big Sky has a mean US Air Quality Index of about 42 in August.
Other months in Big Sky
Compare Big Sky in August
Warmer or cooler than Big Sky in August
Similar destinations in North America — August
Within 300 km: Bozeman's Mountain wildflowers around 20 Jun – 5 Aug, and Yellowstone National Park's Beartooth Highway open around 22 May – 12 Oct.