Sun Valley weather in May
May in Sun Valley: cool, a little rain, with reliable snow — a good time to visit.
#7 of 12 months in Sun Valley · #495 of 604 destinations to visit in May · comfort 67/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Sun Valley climate normals — May
| Daytime high | 13°C / 56°F | 🙂 cool |
|---|---|---|
| Nighttime low | 1°C / 33°F | |
| Feels like (high) | 11°C / 52°F | |
| Rainfall | 65 mm / 2.6 in | 🌦 some rain |
| Rainy days | 14 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 1°C / 34°F | |
| Sunshine | 12.3 h/day | |
| Daylight | 14.7 h | |
| Wind | 12 km/h / 8 mph | |
| Snowfall | 17.9 cm / 7 in | |
| Air quality (US AQI) | 53 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Sun Valley in May — FAQ
- Is May a good time to visit Sun Valley?
- May in Sun Valley: cool, a little rain, with reliable snow — a good time to visit. It ranks #7 of 12 months for Sun Valley on SeasonMap's comfort score (67/100).
- What is the weather like in Sun Valley in May?
- In May, Sun Valley averages a daily high of 13.1°C and a low of 0.7°C, with about 65 mm of rain over roughly 13.6 rainy days.
- What is the air quality in Sun Valley in May?
- Sun Valley has a mean US Air Quality Index of about 53 in May.
- Does it snow in Sun Valley in May?
- Sun Valley sees roughly 17.9 cm of snowfall in May.