Wyoming Weather in September

September in Wyoming averages 23°C (73°F) during the day and 12°C (54°F) at night. Quite a bit of rainfall is typical this month, with around 83 mm (3.3 in) on average. An umbrella is a good idea.

Rainfall in Wyoming in September

You can expect rain on roughly 11 days based on historical data, averaging 83 mm (3.3 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Wyoming in September

Wyoming in September is worth a visit. The temperature is perfect, with 23°C (73°F) during the day and 12°C (54°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Wyoming in September

There are approximately 209 hours of sunshine this month, resulting in mostly clear days.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Wyoming's climate page.

Wyoming Temperature in September

Min Temperature 12°C (54°F)  

Max Temperature 23°C (73°F)  

Chance of Rain 37%  

Precipitation 83 mm (3.3 in)  

Rainy days 11 days  

Humidity 76% *  

Sunshine 209 hours *  

Percentage Sunshine 55% *  

* Data from: Grand Rapids, the United States of America (6 KM, 3 Miles).

What to Wear in Wyoming in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Wyoming in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Wyoming's climate page.

More climate data for Wyoming

Temperature Rainfall Sunshine Humidity

See the full Wyoming climate overview or explore weather in the United States of America.