Sun Valley (Ketchum), Idaho weather in October
Temperature, rain and sunshine in October: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in October
Good
Best time to visit: June, August – September
Best for skiing: December – April
What is the weather like in Sun Valley (Ketchum), Idaho in October?
In October, Sun Valley (Ketchum), Idaho is cool: daytime highs average 12 °C, and nights cool down to about 0 °C. The sun shines for around 7 hours a day. Rain falls on about 6 days, adding up to 34 mm. Snow falls on about 2 days. All in all, October is a good month for a holiday in Sun Valley (Ketchum), Idaho.
October compared
How the weather changes from September to November. Tap a month to open it.
| SeptemberSep | OctoberOct | NovemberNov | |
|---|---|---|---|
| Score | 97 | 70 | 30 |
| Day | 21° | 12° | 4° |
| Night | 7° | 0° | −8° |
| Sun | 8 h | 7 h | 5 h |
| Rain days | 4 | 6 | 7 |
More details for October
- Daylight
- 11 h 6 min07:50 – 18:56
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 13 km/haverage daily peakAll months
- Cloud cover
- 42 %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 %64 %
- Sunshineweight 20 %60 %
- Few rainy daysweight 30 %88 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Mountain air”.
What to pack in October
- Sunscreen
- A jumper for the evenings
- Hat, scarf & gloves
Sun Valley (Ketchum), Idaho in October: quick answers
Is Sun Valley (Ketchum), Idaho hot in October?
No. In October, Sun Valley (Ketchum), Idaho is cool: daytime highs average 12 °C and nights drop to about 0 °C.
Does it rain much in Sun Valley (Ketchum), Idaho in October?
Rain falls on about 6 days, adding up to 34 mm.
Sun Valley (Ketchum), Idaho month by month
The whole year in Sun Valley (Ketchum), IdahoAll destinations: USAWhere to go in October
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