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
Sioux City in September undergoes a slight reduction in the average high-temperature, shifting from August's 81.9°F (27.7°C) to a still moderately hot 75.6°F (24.2°C). Sioux City usually reports an average low-temperature of 55.4°F (13°C) during the month of September.Humidity
The average relative humidity in September is 71%.Rainfall
In Sioux City, in September, during 9.7 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. In 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 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
The average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September in Sioux City is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Frequently asked questions
What are September temperatures in Sioux City?
What is the average humidity in September in Sioux City?
How much does it rain in Sioux City in September?
When it does not snow in Sioux City?
Does it snow in Sioux City in September?
How many hours of daylight does Sioux City have in September?
When is the sunrise / sunset in September in Sioux City?
How many hours of sunshine does Sioux City have in September?
What is the UV index reading in September in Sioux City?
Average temperature in September
Sioux City, IA
- 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
Sioux City, IA
- 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
Sioux City, IA
- 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
Sioux City, IA
- 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
Sioux City, IA
- 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
Sioux City, IA
- 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
Sioux City, IA
- 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
Sioux City, IA
- 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
Sioux City, IA
- Average daylight in September: 12h and 3min
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 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 30min).
Average sunshine days in September
Sioux City, IA
- 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
Sioux City, IA
- 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
Sioux City, IA
- 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
Sioux City, IA
- 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).
Sioux City, Iowa, USA
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