September weather forecastShawnee, WY
September
Weather in September
The first month of the autumn, September, is still a warm month in Shawnee, Wyoming, with an average temperature fluctuating between 54°F (12.2°C) and 75.9°F (24.4°C).Temperature
Shawnee's progression into September involves a minor drop in the average high-temperature, slightly receding from a warm 84.4°F (29.1°C) in August to a still moderately hot 75.9°F (24.4°C). During September, Shawnee notes a substantial drop from the daytime peak to an average minimum temperature of 54°F (12.2°C).Humidity
In Shawnee, the average relative humidity in September is 42%.Rainfall
In Shawnee, Wyoming, in September, during 7.3 rainfall days, 0.47" (12mm) of precipitation is typically accumulated. Throughout the year, there are 84.9 rainfall days, and 9.61" (244mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 43 snowfall days, and 17.64" (448mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:25 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:42 pm MDT.
Sunshine
In September, the average sunshine is 10.8h.UV index
In Shawnee, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 4 in September translates into this advice:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Shawnee, WY
- Average high temperature in September: 75.9°F
The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is December (33.8°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is December (19.2°F).
Average pressure in September
Shawnee, WY
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Shawnee, WY
- Average wind speed in September: 9.8mph
The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest month (with the lowest average wind speed) is August (8.9mph).
Average humidity in September
Shawnee, WY
- Average humidity in September: 42%
The month with the highest relative humidity is February (70%).
The month with the lowest relative humidity is August (40%).
Average rainfall in September
Shawnee, WY
- Average rainfall in September: 0.47"
The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is January (0.31").
Average rainfall days in September
Shawnee, WY
- Average rainfall days in September: 7.3 days
The month with the highest number of rainy days is May (12.4 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in September
Shawnee, WY
- Average snowfall in September: 0.08"
The month with the highest snowfall is November (2.8").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Shawnee, WY
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is February (8.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Shawnee, WY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 10h and 48min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 24min).
Average sunshine days in September
Shawnee, WY
- Average sunshine days in September: 19.9 days
The month with the most sunshine days is December (21.7 days).
The month with the least sunshine days is April (14.5 days).
Average UV index in September
Shawnee, WY
- Average UV index in September: 4
The months with the highest UV index are June, 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
Shawnee, WY
- Average cloud cover in September: 17
The month with the most cloud cover is February (Cloud cover 33).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Shawnee, 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).
