September weather forecastNisland, SD
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Nisland, South Dakota, with an average temperature varying between 73.9°F (23.3°C) and 53.6°F (12°C).Temperature
Nisland, South Dakota, experiences a temperature shift at the start of September, with average high-temperatures adjusting from 83.1°F (28.4°C) in August to a still warm 73.9°F (23.3°C). In Nisland, September's nights observe an average temperature dip to a fresh 53.6°F (12°C).Humidity
The average relative humidity in September is 48%.Rainfall
In Nisland, South Dakota, during September, the rain falls for 7.9 days and regularly aggregates up to 0.75" (19mm) of precipitation. In Nisland, during the entire year, the rain falls for 100 days and collects up to 12.83" (326mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Nisland. September is the first month it typically snows in Nisland. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. In Nisland, during the entire year, snow falls for 52.1 days and aggregates up to 23.54" (598mm) of snow.Daylight
The average length of the day in September in Nisland is 12h and 30min.On the first day of September, sunrise is at 6:17 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:35 pm MDT.
Sunshine
In Nisland, the average sunshine in September is 10.5h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 4 during September translates into the following directions:
Undertake precautions - It is suggested to shield oneself from sunburn. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Boost your sun resistance with garments that are densely woven yet spacious. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Nisland, SD
- Average high temperature in September: 73.9°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (30.4°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).
Average pressure in September
Nisland, 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
Nisland, SD
- Average wind speed in September: 9.1mph
The windiest months (with the highest average wind speed) are January and October (10.4mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).
Average humidity in September
Nisland, SD
- Average humidity in September: 48%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (47%).
Average rainfall in September
Nisland, SD
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Nisland, SD
- Average rainfall days in September: 7.9 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is January (2.8 days).
Average snowfall in September
Nisland, SD
- Average snowfall in September: 0.08"
The month with the highest snowfall is April (4.88").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Nisland, SD
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Nisland, 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: 10h and 30min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days in September
Nisland, SD
- Average sunshine days in September: 19.4 days
The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is April (12.6 days).
Average UV index in September
Nisland, 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, February, November and December (UV index 2).
Average cloud cover in September
Nisland, SD
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Nisland, 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).
