Sun Valley weather in October
October in Sun Valley: cold, a little rain, with clean air — a good time to visit.
#8 of 12 months in Sun Valley · #490 of 604 destinations to visit in October · comfort 64/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Sun Valley climate normals — October
| Daytime high | 12°C / 54°F | 🧥 cold |
|---|---|---|
| Nighttime low | 0°C / 32°F | |
| Feels like (high) | 9°C / 48°F | |
| Rainfall | 37 mm / 1.4 in | 🌦 some rain |
| Rainy days | 6 days | |
| Humidity | 62% | 💧 humid |
| Dew point | -1°C / 30°F | |
| Sunshine | 9.4 h/day | |
| Daylight | 11 h | |
| Wind | 12 km/h / 7 mph | |
| Snowfall | 15.4 cm / 6.1 in | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Sun Valley?
Loading map…
Sun Valley in October — FAQ
- Is October a good time to visit Sun Valley?
- October in Sun Valley: cold, a little rain, with clean air — a good time to visit. It ranks #8 of 12 months for Sun Valley on SeasonMap's comfort score (64/100).
- What is the weather like in Sun Valley in October?
- In October, Sun Valley averages a daily high of 12.2°C and a low of 0.2°C, with about 36.7 mm of rain over roughly 5.8 rainy days.
- What is the air quality in Sun Valley in October?
- Sun Valley has a mean US Air Quality Index of about 34 in October.
- Does it snow in Sun Valley in October?
- Sun Valley sees roughly 15.4 cm of snowfall in October.