Sun Valley (Ketchum), Idaho weather in January
Temperature, rain and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Poor
Best time to visit: June, August – September
Best for skiing: December – April
What is the weather like in Sun Valley (Ketchum), Idaho in January?
In January, Sun Valley (Ketchum), Idaho is freezing cold: daytime highs average −3 °C, and nights often drop below freezing (−14 °C). Expect around 5 hours of sunshine a day. Precipitation, often as snow, falls on about 9 days, totalling 53 mm. Snow falls on about 8 days. All in all, January is not an ideal month for a holiday in Sun Valley (Ketchum), Idaho.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 21 | 25 | 30 |
| Day | −2° | −3° | −1° |
| Night | −14° | −14° | −12° |
| Sun | 4 h | 5 h | 6 h |
| Rain days | 10 | 9 | 8 |
More details for January
- Daylight
- 9 h 16 min08:08 – 17:24
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 9 km/haverage daily peakAll months
- Cloud cover
- 58 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 8 days1 cm or more of fresh snowAll months
- Time zone
- UTC−7America/Boise
How the score comes together
- Temperatureweight 50 %0 %
- Sunshineweight 20 %25 %
- Few rainy daysweight 30 %66 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Mountain air”.
What to pack in January
- Warm jacket
- Hat, scarf & gloves
- Rain jacket or umbrella
Sun Valley (Ketchum), Idaho in January: quick answers
Is Sun Valley (Ketchum), Idaho hot in January?
No. In January, Sun Valley (Ketchum), Idaho is freezing cold: daytime highs average −3 °C and nights drop to about −14 °C.
Does it rain much in Sun Valley (Ketchum), Idaho in January?
Rain falls on about 9 days, adding up to 53 mm.
Sun Valley (Ketchum), Idaho month by month
The whole year in Sun Valley (Ketchum), IdahoAll destinations: USAWhere to go in January
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