September weather forecastUrbandale, IA
September
Weather in September
The arrival of September in Urbandale brings the much-awaited decline of summer's intense heat, marking the advent of fall. The foliage transition from lush green to shades of yellow and brown begins in this month. With the average high temperature dropping to 75.6°F (24.2°C), one can welcome the comfortable embrace of sweatshirt weather. The crisp mornings and evenings with the colorful landscape provide a picturesque backdrop for outdoor exploits. The ever-shortening daylight hours mark a gradual shift towards the seasonal coolness.Temperature
The beginning of September in Urbandale brings a slight decrease in the average high-temperature, transitioning from 81.3°F (27.4°C) in August to a still moderately hot 75.6°F (24.2°C). An average nighttime temperature of 55.9°F (13.3°C) is recorded during September.Humidity
The average relative humidity in September is 76%.Rainfall
In Urbandale, in September, during 9.7 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, in Urbandale, Iowa, there are 114.6 rainfall days, and 15.51" (394mm) of precipitation is accumulated.Snowfall
In Urbandale, snow does not fall in June through September.Daylight
In September, the average length of the day 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, sunrise is at 7:11 am and sunset at 6:57 pm CDT.
Sunshine
In September, the average sunshine is 9.4h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: The UV index of 4 during September translates into the following guidance:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Urbandale, IA
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (82.4°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 (65.1°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure in September
Urbandale, 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
Urbandale, IA
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Urbandale, IA
- Average humidity in September: 76%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Urbandale, IA
- Average rainfall in September: 1.73"
The wettest months (with the highest rainfall) are May and June (2.52").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in September
Urbandale, IA
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (3.5 days).
Average snowfall in September
Urbandale, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Urbandale, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Urbandale, IA
- Average daylight in September: 12h and 30min
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 24min
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
Urbandale, IA
- Average sunshine days in September: 17.8 days
The month with the most sunshine days is December (22.8 days).
The month with the least sunshine days is June (11.2 days).
Average UV index in September
Urbandale, IA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Urbandale, IA
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 28).
Average visibility in September
Urbandale, IA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
