September weather forecastSioux Center, IA
September
Weather in September
September, the first month of the autumn in Sioux Center, is also a moderately hot month, with an average temperature varying between 54.1°F (12.3°C) and 74.5°F (23.6°C).Temperature
A modest decline in the average high-temperature is seen during September, decreasing from 80.2°F (26.8°C) in August to a still warm 74.5°F (23.6°C). September witnesses an average nighttime temperature of 54.1°F (12.3°C).Humidity
In Sioux Center, Iowa, the average relative humidity in September is 72%.Rainfall
In Sioux Center, in September, during 11 rainfall days, 1.93" (49mm) of precipitation is typically accumulated. Throughout the year, there are 120.4 rainfall days, and 21.57" (548mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Sioux Center, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:49 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:07 pm CDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
In September, the average daily maximum UV index in Sioux Center, Iowa, is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum high daily UV index of 4 during September translates into the following directions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sioux Center, IA
- Average high temperature in September: 74.5°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (24.1°F).
- Average low temperature in September: 54.1°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (11.1°F).
Average pressure in September
Sioux Center, 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 Center, IA
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in September
Sioux Center, IA
- Average humidity in September: 72%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Sioux Center, IA
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is January (0.71").
Average rainfall days in September
Sioux Center, IA
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Sioux Center, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Sioux Center, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sioux Center, IA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
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 30min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Sioux Center, IA
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in September
Sioux Center, IA
- 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, October, November and December (UV index 2).
Average cloud cover in September
Sioux Center, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in September
Sioux Center, IA
- 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).
