September weather forecast
Little Sioux, IA

Share

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.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Little Sioux in September?

September temperatures vary between a high-temperature of 76.5°F (24.7°C) and a low-temperature of 56.3°F (13.5°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 87.8°F (31°C).

What is the average humidity in September in Little Sioux?

In Little Sioux, the average relative humidity in September is 71%.

How much does it rain in Little Sioux in September?

In Little Sioux, in September, during 12.1 rainfall days, 2.09" (53mm) of precipitation is typically accumulated.

When it does not snow in Little Sioux?

June through September are months without snowfall.

Does it snow in Little Sioux in September?

In Little Sioux, Iowa, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Little Sioux?

The average day length in September in Little Sioux, Iowa, is 12h and 28min.

What time are sunrise and sunset in September in Little Sioux?

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.

How long on average sun shines in September in Little Sioux?

In Little Sioux, the average sunshine duration in September is 9h.

What is the UV index intensity in September in Little Sioux?

In Little Sioux, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Little Sioux, IA

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in September - Little Sioux, 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 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 - 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 - 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 - 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 - 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).

Little Sioux, Iowa, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location