Sun Valley Weather in September
September in Sun Valley averages 21°C (70°F) during the day and 4°C (39°F) at night. The perfect conditions and low rainfall make it a solid month to visit.
Rainfall in Sun Valley in September
Records from the past 30 years suggest around 7 days of rain, with 29 mm (1.1 in) average for the month. When rain does fall, showers tend to be light and brief. Most days will be dry.
Temperature in Sun Valley in September
September is a perfect month in Sun Valley, with 21°C (70°F) during the day and 4°C (39°F) at night. During September, you'll experience the summer season. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With lows around 4°C (39°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.Our weather planner can help you find worldwide destinations with pleasant weather during this period. June, July, August and September typically offer the best weather for Sun Valley.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Sun Valley's climate page.
Sun Valley Temperature in September
Min Temperature
4°C (39°F)
Max Temperature
21°C (70°F)
Chance of Rain
22%
Precipitation
29 mm (1.1 in)
Rainy days
7 days
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Sun Valley in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Light rain is possible, so consider bringing a small umbrella or rain jacket.What To Do in Sun Valley in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Sun Valley's climate page.
See the full Sun Valley climate overview or explore weather in the United States of America.
