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
The onset of September brings a small shift in high-temperatures, falling from a moderately hot 75.9°F (24.4°C) in August to a comfortable 67.1°F (19.5°C). During September, the temperature is averaged to a low of 46.2°F (7.9°C) at night.Humidity
The average relative humidity in September is 45%.Rainfall
In Wapiti, during September, the rain falls for 8 days and regularly aggregates up to 0.71" (18mm) of precipitation. In Wapiti, during the entire year, the rain falls for 118.9 days and collects up to 10.08" (256mm) of precipitation.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 0.47" (12mm) of snow. Throughout the year, there are 67.3 snowfall days, and 29.72" (755mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 30min.On the first day of September, sunrise is at 6:41 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 6:59 pm MDT.
Sunshine
In Wapiti, the average sunshine in September is 10.7h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: A maximum UV index of 3 in September translates into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. During bright days, sunglasses that offer UVA and UVB defense are recommended. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How many days does it rain in September?
When does it start snowing?
How many hours of daylight does Wapiti have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Wapiti have in September?
How high is the UV index in September?
Average temperature in September
Wapiti, WY
- Average high temperature in September: 67.1°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is December (27.7°F).
- Average low temperature in September: 46.2°F
The month with the highest average low temperature is July (54.7°F).
The coldest month (with the lowest average low temperature) is December (12.4°F).
Average pressure in September
Wapiti, WY
- Average pressure in September: 29.98"Hg
The months with the highest atmospheric pressure are January and December (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Wapiti, WY
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Wapiti, WY
- Average humidity in September: 45%
The month with the highest relative humidity is February (77%).
The months with the lowest relative humidity are July and August (41%).
Average rainfall in September
Wapiti, WY
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is May (1.77").
The driest months (with the least rainfall) are January and December (0.35").
Average rainfall days in September
Wapiti, WY
- Average rainfall days in September: 8 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is December (6.7 days).
Average snowfall in September
Wapiti, WY
- Average snowfall in September: 0.47"
The month with the highest snowfall is February (5.2").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Wapiti, WY
- Average snowfall days in September: 0.7 days
The month with the highest number of snowfall days is February (13.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Wapiti, 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 4min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).
Average sunshine days in September
Wapiti, WY
- Average sunshine days in September: 17.8 days
The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is May (7.2 days).
Average UV index in September
Wapiti, WY
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Wapiti, WY
- Average cloud cover in September: 16
The months with the most cloud cover are February and April (Cloud cover 32).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in September
Wapiti, 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).
Wapiti, Wyoming, USA
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