Sun Valley (Ketchum), Idaho weather in May
Temperature, rain and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Excellent
Best time to visit: June, August – September
Best for skiing: December – April
What is the weather like in Sun Valley (Ketchum), Idaho in May?
In May, Sun Valley (Ketchum), Idaho is cool: daytime highs average 15 °C, and nights cool down to about 1 °C. The sun shines for around 9 hours a day. Rain is frequent, with about 9 rainy days and 44 mm in total. Snow falls on about 2 days. All in all, May is an excellent month for a holiday in Sun Valley (Ketchum), Idaho.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 14 h 41 min06:13 – 20:54
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 14 km/haverage daily peakAll months
- Cloud cover
- 52 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 2 days1 cm or more of fresh snowAll months
- Time zone
- UTC−6America/Boise
How the score comes together
- Temperatureweight 50 %87 %
- Sunshineweight 20 %93 %
- Few rainy daysweight 30 %63 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Mountain air”.
What to pack in May
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Sun Valley (Ketchum), Idaho in May: quick answers
Is Sun Valley (Ketchum), Idaho hot in May?
No. In May, Sun Valley (Ketchum), Idaho is cool: daytime highs average 15 °C and nights drop to about 1 °C.
Does it rain much in Sun Valley (Ketchum), Idaho in May?
Rain is frequent, with about 9 rainy days and 44 mm in total.
Sun Valley (Ketchum), Idaho month by month
The whole year in Sun Valley (Ketchum), IdahoAll destinations: USAWhere to go in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences