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
September's arrival in Devils Tower comes with a decrease in the average high-temperature, moving from a warm 81.9°F (27.7°C) in August to a pleasant 72.9°F (22.7°C). Throughout September, an average low-temperature of 51.8°F (11°C) is experienced.Humidity
August and September, with an average relative humidity of 49%, are the least humid months.Rainfall
In Devils Tower, Wyoming, during September, the rain falls for 7.6 days and regularly aggregates up to 0.91" (23mm) of precipitation. In Devils Tower, during the entire year, the rain falls for 99.6 days and collects up to 15.71" (399mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.43" (11mm) of snow. In Devils Tower, during the entire year, snow falls for 57 days and aggregates up to 36.46" (926mm) of snow.Daylight
The average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:34 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:40 pm MDT.
Sunshine
In September, the average sunshine is 10.4h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Devils Tower in September?
What are the least humid months?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing?
How many hours of daylight does Devils Tower have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Devils Tower, WY
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (30.9°F).
- Average low temperature in September: 51.8°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is February (16.2°F).
Average pressure in September
Devils Tower, WY
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Devils Tower, WY
- Average wind speed in September: 8.8mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (8mph).
Average humidity in September
Devils Tower, WY
- Average humidity in September: 49%
The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are August and September (49%).
Average rainfall in September
Devils Tower, WY
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is May (2.32").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in September
Devils Tower, WY
- Average rainfall days in September: 7.6 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (2.9 days).
Average snowfall in September
Devils Tower, WY
- Average snowfall in September: 0.43"
The month with the highest snowfall is April (7.36").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Devils Tower, WY
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (11.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Devils Tower, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The months with the least sunshine are February and December (Average sunshine: 5h and 42min).
Average sunshine days in September
Devils Tower, WY
- Average sunshine days in September: 20.3 days
The months with the most sunshine days are September and November (20.3 days).
The month with the least sunshine days is May (12.7 days).
Average UV index in September
Devils Tower, WY
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, April, November and December (UV index 2).
Average cloud cover in September
Devils Tower, WY
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Devils Tower, 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).
Devils Tower, Wyoming, USA
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