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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.

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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 TemperatureMin Temperature 4°C (39°F)  
Max TemperatureMax Temperature 21°C (70°F)  
Chance of RainChance of Rain 22%  
PrecipitationPrecipitation 29 mm (1.1 in)  
Rainy daysRainy 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 →

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

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.

Cycling
10/10
Walking
10/10
Camping
5/10
Outdoor sports
10/10

Select a Month

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.

More climate data for Sun Valley