Sun Valley weather in January
January in Sun Valley: freezing, a little rain, with clean air — an excellent time to visit.
#5 of 12 months in Sun Valley · #169 of 604 destinations to visit in January · comfort 80/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Sun Valley climate normals — January
| Daytime high | -1°C / 30°F | 🥶 freezing |
|---|---|---|
| Nighttime low | -10°C / 13°F | |
| Feels like (high) | -5°C / 23°F | |
| Rainfall | 47 mm / 1.8 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | -11°C / 13°F | |
| Sunshine | 6.9 h/day | |
| Daylight | 9.4 h | |
| Wind | 9 km/h / 6 mph | |
| Snowfall | 48 cm / 18.9 in | |
| Air quality (US AQI) | 40 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Sun Valley?
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Sun Valley in January — FAQ
- Is January a good time to visit Sun Valley?
- January in Sun Valley: freezing, a little rain, with clean air — an excellent time to visit. It ranks #5 of 12 months for Sun Valley on SeasonMap's comfort score (80/100).
- What is the weather like in Sun Valley in January?
- In January, Sun Valley averages a daily high of -1°C and a low of -10.4°C, with about 46.6 mm of rain over roughly 9.2 rainy days.
- What is the air quality in Sun Valley in January?
- Sun Valley has a mean US Air Quality Index of about 40 in January.
- Does it snow in Sun Valley in January?
- Sun Valley sees roughly 48 cm of snowfall in January.