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
A minor decrease in the average high-temperature is observed during September, shifting from a moderately hot 81.1°F (27.3°C) in August to a still warm 74.3°F (23.5°C). In September, Sioux Falls's temperature tends to fall to an average low of 53.2°F (11.8°C) during the night.Humidity
In Sioux Falls, the average relative humidity in September is 70%.Rainfall
In Sioux Falls, in September, during 10.5 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. Throughout the year, there are 117.1 rainfall days, and 20.71" (526mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Sioux Falls, South Dakota.Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:51 am and sunset at 8:01 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:09 pm CDT.
Sunshine
In September, the average sunshine is 8.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Put precautions into practice - Protective measures against sun-induced damage are advised. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Frequently asked questions
What is the temperature in September in Sioux Falls?
What is the average humidity in September in Sioux Falls?
How much does it rain in Sioux Falls in September?
When it does not snow in Sioux Falls?
Does it snow in Sioux Falls in September?
How many hours of daylight does Sioux Falls have in September?
When is the sunrise / sunset in September in Sioux Falls?
How many hours of sunshine does Sioux Falls have in September?
How high is the UV index in September in Sioux Falls?
Average temperature in September
Sioux Falls, SD
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (23.4°F).
- Average low temperature in September: 53.2°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).
Average pressure in September
Sioux Falls, 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
Sioux Falls, SD
- Average wind speed in September: 9.4mph
The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is July (8mph).
Average humidity in September
Sioux Falls, SD
- Average humidity in September: 70%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (66%).
Average rainfall in September
Sioux Falls, SD
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is June (3.27").
The driest months (with the least rainfall) are January, February and November (0.67").
Average rainfall days in September
Sioux Falls, SD
- Average rainfall days in September: 10.5 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 days).
Average snowfall in September
Sioux Falls, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.25").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Sioux Falls, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sioux Falls, SD
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 5min
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 0min).
Average sunshine days in September
Sioux Falls, SD
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is June (10 days).
Average UV index in September
Sioux Falls, SD
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Sioux Falls, SD
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in September
Sioux Falls, 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).
Sioux Falls, South Dakota, USA
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