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
September indicates a minor shift in the average high-temperature, from August's warm 81.7°F (27.6°C) to a still moderately hot 75.6°F (24.2°C). West Des Moines cools down to an average low-temperature of 55.9°F (13.3°C) throughout the month of September.Humidity
In West Des Moines, the average relative humidity in September is 76%.Rainfall
In West Des Moines, in September, during 11.5 rainfall days, 2.68" (68mm) of precipitation is typically accumulated. Throughout the year, there are 130.3 rainfall days, and 25.91" (658mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In West Des Moines, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:41 am and sunset at 7:47 pm. On the last day of September, in West Des Moines, sunrise is at 7:11 am and sunset at 6:57 pm CDT.
Sunshine
The average sunshine in September is 9.3h.UV index
In West Des Moines, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index of 4 during September translates into the following directions:
Guard yourself - Avoiding sunburn is suggested. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in West Des Moines?
What is the average humidity in September in West Des Moines?
How many days does it rain in September in West Des Moines?
When it does not snow in West Des Moines?
Does it snow in West Des Moines in September?
What is the average length of the day in September in West Des Moines?
When is the sunrise / sunset in September in West Des Moines?
How many hours of sunshine does West Des Moines have in September?
What is the UV index intensity in September in West Des Moines?
Average temperature in September
West Des Moines, IA
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure in September
West 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).
Average wind speed in September
West Des Moines, IA
- Average wind speed in September: 8mph
The windiest months (with the highest average wind speed) are January, March and April (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
West Des Moines, IA
- Average humidity in September: 76%
The months with the highest relative humidity are January, February and June (82%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
West Des Moines, IA
- Average rainfall in September: 2.68"
The wettest month (with the highest rainfall) is May (4.33").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in September
West Des Moines, IA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
West Des Moines, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.37").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
West Des Moines, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
West Des Moines, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
West Des Moines, IA
- Average sunshine days in September: 17 days
The months with the most sunshine days are November and December (18.7 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in September
West 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).
Average cloud cover in September
West Des Moines, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are July and September (Cloud cover 29).
Average visibility in September
West Des Moines, 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).
West Des Moines, Iowa, USA
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