September weather forecastDakota Dunes, SD
September
Weather in September
The first month of the autumn, September, is still a warm month in Dakota Dunes, South Dakota, with an average temperature fluctuating between 55°F (12.8°C) and 76.1°F (24.5°C).Temperature
With the onset of September, the average high-temperature subtly recedes from August's 82°F (27.8°C) to a still moderately hot 76.1°F (24.5°C). Dakota Dunes experiences a mean temperature of 55°F (12.8°C) during September nights.Humidity
The average relative humidity in September is 70%.Rainfall
In Dakota Dunes, in September, during 11.8 rainfall days, 1.93" (49mm) of precipitation is typically accumulated. Throughout the year, there are 122 rainfall days, and 21.61" (549mm) of precipitation is accumulated.Snowfall
In Dakota Dunes, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:51 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:08 pm CDT.
Sunshine
In Dakota Dunes, the average sunshine in September is 8.8h.UV index
In Dakota Dunes, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 5 during September translates into the following recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dakota Dunes, SD
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure in September
Dakota Dunes, SD
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Dakota Dunes, SD
- Average wind speed in September: 9mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.6mph).
Average humidity in September
Dakota Dunes, SD
- Average humidity in September: 70%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (65%).
Average rainfall in September
Dakota Dunes, SD
- Average rainfall in September: 1.93"
The wettest months (with the highest rainfall) are May and June (3.03").
The driest month (with the least rainfall) is February (0.67").
Average rainfall days in September
Dakota Dunes, SD
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Dakota Dunes, SD
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.95").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Dakota Dunes, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Dakota Dunes, SD
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in September
Dakota Dunes, SD
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (9.7 days).
Average UV index in September
Dakota Dunes, SD
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Dakota Dunes, SD
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Dakota Dunes, SD
- 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).
