September weather forecastSheridan, WY
September
Weather in September
September in Sheridan, Wyoming, marks the commencement of the tranquil autumn season. The early days of the month retain August's warmth but as the month progresses, a perceptible decline in temperature indicates the onset of fall. The landscapes undergo an aesthetic transformation, turning into a multitude of varied hues, making sightseeing a visual treat. This month also sees a slight increase in cloud cover, which does not particularly affect the pleasant daytime weather. Despite the colder evenings, September's weather remains conducive enough for various outdoor activities.Temperature
With the beginning of September, the average high-temperature shows a small decrease, transitioning from a moderately hot 77.4°F (25.2°C) in August to a pleasant 68.7°F (20.4°C). During September, Sheridan sees a mean low-temperature of 48.7°F (9.3°C).Humidity
The average relative humidity in September is 48%.Rainfall
In Sheridan, in September, during 12.5 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. Throughout the year, there are 165.2 rainfall days, and 21.22" (539mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows in Sheridan, Wyoming. Throughout September, in the average 0.3 snowfall days, it receives 0.35" (9mm) of snow. Throughout the year, there are 78.9 snowfall days, and 46.3" (1176mm) of snow is accumulated.Daylight
In Sheridan, Wyoming, the average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:44 pm. On the last day of September, in Sheridan, sunrise is at 7:05 am and sunset at 6:49 pm MDT.
Sunshine
In Sheridan, the average sunshine in September is 10.8h.UV index
In September, the average daily maximum UV index in Sheridan is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sheridan, WY
- Average high temperature in September: 68.7°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is February (29.1°F).
- Average low temperature in September: 48.7°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).
Average pressure in September
Sheridan, WY
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Sheridan, WY
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in September
Sheridan, WY
- Average humidity in September: 48%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (46%).
Average rainfall in September
Sheridan, WY
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is May (3.43").
The driest month (with the least rainfall) is December (0.75").
Average rainfall days in September
Sheridan, WY
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (22.3 days).
The month with the least rainy days is November (7.5 days).
Average snowfall in September
Sheridan, WY
- Average snowfall in September: 0.35"
The month with the highest snowfall is April (8.7").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Sheridan, WY
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is February (15.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Sheridan, WY
- Average daylight in September: 12h and 30min
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 48min
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 6min).
Average sunshine days in September
Sheridan, WY
- Average sunshine days in September: 13.6 days
The month with the most sunshine days is November (15.2 days).
The month with the least sunshine days is May (5.8 days).
Average UV index in September
Sheridan, 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, March, April, October, November and December (UV index 2).
Average cloud cover in September
Sheridan, WY
- Average cloud cover in September: 18
The months with the most cloud cover are February and April (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in September
Sheridan, 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).
