September weather forecastSouth Sioux City, NE
September
Weather in September
September sees a subtle shift in South Sioux City's weather from glaring summer to welcoming fall season. Notable is a drop in daytime temperatures, now averaging 75.6°F (24.2°C). While the weather remains moderately hot, the clear blue skies against the backdrop of burnt-orange leaves begin to transform the landscape. As September proceeds, the gradual cooling trend is complemented by shorter daylight hours. South Sioux City, in September, offers a comfortable mix of summer and autumn, attracting visitors for pleasant outdoor experiences.Temperature
South Sioux City's transition into September involves a gentle shift in temperature, receding from 81.9°F (27.7°C) in August to a still warm 75.6°F (24.2°C). South Sioux City's average low-temperature during September nights is observed to be a refreshing 55.4°F (13°C).Humidity
In September, the average relative humidity is 71%.Rainfall
In September, the rain falls for 9.7 days. Throughout September, 1.26" (32mm) of precipitation is accumulated. In South Sioux City, during the entire year, the rain falls for 102.3 days and collects up to 12.91" (328mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In South Sioux City, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:51 am and sunset at 7:59 pm. On the last day of September, sunrise is at 7:22 am and sunset at 7:08 pm CDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
South Sioux City, NE
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in September: 55.4°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 (13.5°F).
Average pressure in September
South Sioux City, NE
- Average pressure in September: 29.99"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
South Sioux City, NE
- Average wind speed in September: 8.9mph
The windiest month (with the highest average wind speed) is April (11mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in September
South Sioux City, NE
- Average humidity in September: 71%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (65%).
Average rainfall in September
South Sioux City, NE
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is June (1.85").
The driest months (with the least rainfall) are January and February (0.39").
Average rainfall days in September
South Sioux City, NE
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is June (14.6 days).
The month with the least rainy days is January (2.6 days).
Average snowfall in September
South Sioux City, NE
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.77").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
South Sioux City, NE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
South Sioux City, NE
- 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 54min
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 30min).
Average sunshine days in September
South Sioux City, NE
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is June (13.1 days).
Average UV index in September
South Sioux City, NE
- Average UV index in September: 4
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
South Sioux City, NE
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
South Sioux City, NE
- 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).
