Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
As August transitions into September, Cheyenne sees a gentle drop in the average high-temperature, transitioning from 81.1°F to a still warm 73.8°F. September nights in Cheyenne observe an average temperature dip to a cool 52.3°F.Humidity
The average relative humidity in September is 44%.Rainfall
In Cheyenne, in September, it is raining for 8.4 days, with typically 0.87" of accumulated precipitation. In Cheyenne, Wyoming, during the entire year, the rain falls for 116 days and collects up to 14.57" of precipitation.Snowfall
June through September are months without snowfall in Cheyenne.Daylight
In Cheyenne, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:43 pm MDT.
Sunshine
In Cheyenne, the average sunshine in September is 10.7h.UV index
The average daily maximum UV index in September in Cheyenne is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The Sun's radiation is especially intense around midday; try to stay in shade during this period. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
FAQ
What are September temperatures in Cheyenne?
What is the average humidity in September in Cheyenne?
How much does it rain in Cheyenne in September?
When it does not snow in Cheyenne?
Does it snow in Cheyenne in September?
How many hours of daylight does Cheyenne have in September?
When is the sunrise / sunset in September in Cheyenne?
How long on average sun shines in September in Cheyenne?
What is the UV index intensity in September in Cheyenne?
Average temperature in September
Cheyenne, WY
- Average high temperature in September: 73.8°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is December (34.7°F).
- Average low temperature in September: 52.3°F
The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is December (20.3°F).
Average pressure in September
Cheyenne, WY
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Cheyenne, WY
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is January (14.2mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).
Average humidity in September
Cheyenne, WY
- Average humidity in September: 44%
The month with the highest relative humidity is February (64%).
The month with the lowest relative humidity is August (43%).
Average rainfall in September
Cheyenne, WY
- Average rainfall in September: 0.87"
The wettest month (with the highest rainfall) is May (2.95").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Cheyenne, WY
- Average rainfall days in September: 8.4 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (4.7 days).
Average snowfall in September
Cheyenne, WY
- Average snowfall in September: 0"
The month with the highest snowfall is March (6.06").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Cheyenne, WY
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (11.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Cheyenne, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 10h and 4min
The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The month with the least sunshine is February (Average sunshine: 6h and 30min).
Average sunshine days in September
Cheyenne, WY
- Average sunshine days in September: 19 days
The month with the most sunshine days is January (20.7 days).
The month with the least sunshine days is April (9.3 days).
Average UV index in September
Cheyenne, WY
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Cheyenne, WY
- Average cloud cover in September: 18
The months with the most cloud cover are April and May (Cloud cover 32).
The month with the least cloud cover is September (Cloud cover 18).
Average visibility in September
Cheyenne, WY
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Cheyenne, Wyoming, USA
Weather forecast for your location
2. Allow the app to use your location
