September weather forecastDe Smet, SD
September
Weather in September
The first month of the autumn, September, is still a warm month in De Smet, South Dakota, with temperature in the range of an average low of 54.5°F (12.5°C) and an average high of 75.7°F (24.3°C).Temperature
In De Smet, entering September brings a subtle temperature decrement, reducing from August's 84.2°F (29°C) to a still warm 75.7°F (24.3°C). De Smet anticipates an average minimum temperature of 54.5°F (12.5°C) in the month of September.Humidity
With an average relative humidity of 62%, September is the least humid month.Rainfall
In De Smet, during September, the rain falls for 9.8 days and regularly aggregates up to 1.38" (35mm) of precipitation. Throughout the year, there are 101.8 rainfall days, and 18.19" (462mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In De Smet, South Dakota, the average length of the day in September is 12h and 30min.On the first day of September in De Smet, sunrise is at 6:53 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:12 pm CDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
In De Smet, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
De Smet, SD
- Average high temperature in September: 75.7°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (23.2°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (8.2°F).
Average pressure in September
De Smet, SD
- Average pressure in September: 29.96"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
De Smet, SD
- Average wind speed in September: 9.7mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (8.6mph).
Average humidity in September
De Smet, SD
- Average humidity in September: 62%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is September (62%).
Average rainfall in September
De Smet, SD
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
De Smet, SD
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is June (15.2 days).
The month with the least rainy days is February (1.8 days).
Average snowfall in September
De Smet, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.54").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
De Smet, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (9.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
De Smet, SD
- 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: 8h and 54min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in September
De Smet, SD
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is November (21.8 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in September
De Smet, SD
- 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 and November (UV index 1).
Average cloud cover in September
De Smet, SD
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 22).
Average visibility in September
De Smet, 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).
