Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
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 excellent 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 excellent 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.
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
Sun Valley Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sun Valley - and find the best time to visit.
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
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.
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Cycling10/10 -
Walking10/10 -
Camping5/10 -
Outdoor sports10/10
Sun Valley 3-Day Forecast
More climate data for Sun Valley
See the full Sun Valley climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
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