SeasonMapBig Sky weather by month
United States
The best time to visit Big Sky is December to February — 94/100 in February, -1°C and 14 rainy days. The best season is winter, December to February (90/100 on average).
The worst month is August at 12/100 — nice, a little rain, clean air. See August →
Updated September 2026 · climate normals from ERA5 reanalysis
Planning the wider trip? Best time to visit United States →
Big Sky, month by month
Comfort score out of 100 for the kind of trip Big Sky is best for, the average high, rainy days and hours of sun a day from the climate normals, and how busy it tends to be.
| Month | Score | Tier | High | Rain | Sun | Crowds | On |
|---|---|---|---|---|---|---|---|
| JanJanuary | 90 | S | -2°C | 12 d | 7 h | Busy | 1 |
| FebFebruary | 94 | S | -1°C | 14 d | 8 h | Busy | 1 |
| MarMarch | 83 | A | 3°C | 14 d | 10 h | Busy | 1 |
| AprApril | 77 | B | 7°C | 15 d | 11 h | Shoulder | 3 |
| MayMay | 50 | D | 12°C | 16 d | 12 h | Shoulder | 2 |
| JunJune | 20 | F | 20°C | 15 d | 13 h | Busy | 3 |
| JulJuly | 14 | F | 26°C | 10 d | 14 h | Peak | 3 |
| AugAugust | 12 | F | 24°C | 10 d | 12 h | Busy | 2 |
| SepSeptember | 23 | F | 19°C | 10 d | 10 h | Busy | 2 |
| OctOctober | 59 | D | 10°C | 12 d | 9 h | Shoulder | 2 |
| NovNovember | 74 | B | 3°C | 11 d | 7 h | Busy | 3 |
| DecDecember | 87 | A | -1°C | 12 d | 6 h | Busy | 1 |
What's on in Big Sky through the year
Festivals, natural spectacles, holidays and the seasons to watch out for — curated and sourced. The month pages carry the detail.
Crowds in Big Sky in February
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.
Busyone of its best months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet