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 in Deadwood, South Dakota, entails a subtle temperature shift, as the average high-temperature eases from a warm 80.1°F (26.7°C) in August to a pleasant 71.8°F (22.1°C). During the month of September, the temperature in Deadwood generally drops to a low average of 51.3°F (10.7°C).Humidity
The months with the lowest humidity in Deadwood, South Dakota, are August and September, with an average relative humidity of 51%.Rainfall
In Deadwood, in September, during 6.8 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. In Deadwood, South Dakota, during the entire year, the rain falls for 96.1 days and collects up to 14.02" (356mm) 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 0.3 snowfall days, it receives 0.04" (1mm) of snow. In Deadwood, during the entire year, snow falls for 66.6 days and aggregates up to 34.53" (877mm) of snow.Daylight
The average length of the day in September in Deadwood is 12h and 30min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:30 pm. On the last day of September, in Deadwood, South Dakota, sunrise is at 6:52 am and sunset at 6:36 pm MDT.
Sunshine
In Deadwood, South Dakota, the average sunshine in September is 10.5h.UV index
In Deadwood, South Dakota, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Deadwood in September?
What is the least humid month in Deadwood?
What is the average humidity in September in Deadwood?
How many days does it rain in September in Deadwood?
When does it start to snow in Deadwood?
What is the average length of the day in September in Deadwood?
When is the sunrise / sunset in September in Deadwood?
How many hours of sunshine does Deadwood have in September?
What is the UV index reading in September in Deadwood?
Average temperature in September
Deadwood, SD
- Average high temperature in September: 71.8°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in September: 51.3°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is February (15.4°F).
Average pressure in September
Deadwood, SD
- 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
Deadwood, SD
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is October (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.6mph).
Average humidity in September
Deadwood, SD
- Average humidity in September: 51%
The months with the highest relative humidity are January and February (79%).
The months with the lowest relative humidity are August and September (51%).
Average rainfall in September
Deadwood, SD
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Deadwood, SD
- Average rainfall days in September: 6.8 days
The month with the highest number of rainy days is June (14.2 days).
The month with the least rainy days is November (2.7 days).
Average snowfall in September
Deadwood, SD
- Average snowfall in September: 0.04"
The month with the highest snowfall is April (6.54").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Deadwood, SD
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Deadwood, SD
- 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 3min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 54min).
Average sunshine days in September
Deadwood, SD
- Average sunshine days in September: 19.6 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in September
Deadwood, SD
- 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, October, November and December (UV index 2).
Average cloud cover in September
Deadwood, SD
- Average cloud cover in September: 18
The months with the most cloud cover are February and April (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Deadwood, SD
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Deadwood, South Dakota, USA
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