September weather forecast
Des Moines, IA

City buildings in Des Moines, Iowa
City buildings in Des Moines, Iowa

Weather in September

September, the first month of the autumn in Des Moines, is also a moderately hot month, with an average temperature ranging between min 55.9°F (13.3°C) and max 75.6°F (24.2°C).

Temperature

In September, the average high-temperature marginally drops from 81.7°F (27.6°C) in August to a still moderately hot 75.6°F (24.2°C). The average low-temperature, in September, is 55.9°F (13.3°C).

Humidity

In Des Moines, the average relative humidity in September is 76%.

Rainfall

In September, in Des Moines, the rain falls for 10.5 days. Throughout September, 1.73" (44mm) of precipitation is accumulated. In Des Moines, during the entire year, the rain falls for 114.4 days and collects up to 16.38" (416mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In September, the average length of the day in Des Moines is 12h and 28min.
On the first day of September, sunrise is at 6:40 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:58 pm CDT.

Sunshine

In Des Moines, the average sunshine in September is 9.3h.

UV index

The average daily maximum UV index in September in Des Moines is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Des Moines?

In September, the average relative humidity is 76%.

How many days does it rain in September in Des Moines?

In Des Moines, in September, it is raining for 10.5 days, with typically 1.73" (44mm) of accumulated precipitation.

When it does not snow in Des Moines?

June through September are months without snowfall in Des Moines, Iowa.

Does it snow in Des Moines in September?

In Des Moines, Iowa, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Des Moines?

In September, the average day length is 12h and 28min.

When is the sunrise / sunset in September in Des Moines?

In September, on the first day of the month, sunrise is at 6:40 am and sunset at 7:47 pm. On the last day of the month, in Des Moines, Iowa, sunrise is at 7:10 am and sunset at 6:58 pm CDT.

How many hours of sunshine does Des Moines have in September?

In September, the average sunshine duration is 9.3h.

How high is the UV index in September in Des Moines?

In September, the average daily maximum UV index in Des Moines, Iowa, is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Des Moines, IA

Average temperature in September - Des Moines, IA
  • Average high temperature in September: 75.6°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (28.2°F).

  • Average low temperature in September: 55.9°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 (15.1°F).

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Average pressure in September
Des Moines, IA

Average pressure in September - Des Moines, IA
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in September
Des Moines, IA

Average wind speed in September - Des Moines, IA
  • Average wind speed in September: 8mph

The windiest months (with the highest average wind speed) are January, February, March and April (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

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Average humidity in September
Des Moines, IA

Average humidity in September - Des Moines, IA
  • Average humidity in September: 76%

The months with the highest relative humidity are January and June (82%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in September
Des Moines, IA

Average rainfall in September - Des Moines, IA
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in September
Des Moines, IA

Average rainfall days in September - Des Moines, IA
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is February (3 days).

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Average snowfall in September
Des Moines, IA

Average snowfall in September - Des Moines, IA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.24").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Des Moines, IA

Average snowfall days in September - Des Moines, IA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Des Moines, IA

Average daylight in September / Average sunshine in September - Des Moines, IA
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 8min).
The month with the shortest days is December (Average daylight: 9h and 13min).

  • Average sunshine in September: 9h and 18min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

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Average sunshine days in September
Des Moines, IA

Average sunshine days in September - Des Moines, IA
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is December (22.3 days).
The month with the least sunshine days is June (12.2 days).

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Average UV index in September
Des Moines, IA

Average UV index in September - Des Moines, IA
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in September
Des Moines, IA

Average cloud cover in September - Des Moines, IA
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and September (Cloud cover 29).

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Average visibility in September
Des Moines, IA

Average visibility in September - Des Moines, 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).

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