September weather forecastLittle Sioux, IA
September
Weather in September
The first month of the autumn, September, is still a warm month in Little Sioux, Iowa, with temperature in the range of an average high of 76.5°F (24.7°C) and an average low of 56.3°F (13.5°C).Temperature
Transition into September subtly marks a drop in the average high-temperature, moderately moving from 82.2°F (27.9°C) in August to a still moderately hot 76.5°F (24.7°C). The low-temperature average for Little Sioux during September stands at a moderate 56.3°F (13.5°C).Humidity
In Little Sioux, Iowa, the average relative humidity in September is 71%.Rainfall
In Little Sioux, in September, during 12.1 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. In Little Sioux, during the entire year, the rain falls for 125.1 days and collects up to 22.64" (575mm) of precipitation.Snowfall
In Little Sioux, Iowa, snow does not fall in June through September.Daylight
In Little Sioux, the average length of the day in September is 12h and 28min.On the first day of September in Little Sioux, sunrise is at 6:50 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:06 pm CDT.
Sunshine
In September, the average sunshine is 9h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Prioritize safety - Recommendations to avert sunburn are shared. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Little Sioux, IA
- Average high temperature in September: 76.5°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure in September
Little Sioux, 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
Little Sioux, IA
- Average wind speed in September: 8.6mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in September
Little Sioux, IA
- Average humidity in September: 71%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is October (66%).
Average rainfall in September
Little Sioux, IA
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is January (0.71").
Average rainfall days in September
Little Sioux, IA
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is June (16.8 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Little Sioux, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Little Sioux, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Little Sioux, IA
- 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 12min).
- Average sunshine in September: 9h and 0min
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 42min).
Average sunshine days in September
Little Sioux, IA
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in September
Little Sioux, IA
- 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
Little Sioux, IA
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
Little Sioux, 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).
