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
The arrival of September suggests a slight decrease in the average high-temperature, moving from 81.1°F (27.3°C) in August to a still moderately hot 75.6°F (24.2°C). Throughout September nights, West Chester registers an average low-temperature of 56.3°F (13.5°C).Humidity
In West Chester, the average relative humidity in September is 76%.Rainfall
In West Chester, Iowa, in September, it is raining for 9.5 days, with typically 1.65" (42mm) of accumulated precipitation. In West Chester, Iowa, during the entire year, the rain falls for 123.7 days and collects up to 18.94" (481mm) of precipitation.Snowfall
In West Chester, snow does not fall in May through September.Daylight
The average length of the day in September in West Chester is 12h and 28min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:50 pm CDT.
Sunshine
In September, the average sunshine in West Chester, Iowa, is 9.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Frequently asked questions
What are the temperatures in West Chester in September?
What is the average humidity in September in West Chester?
How many days does it rain in September in West Chester?
When it does not snow in West Chester?
Does it snow in West Chester in September?
How many hours of daylight does West Chester have in September?
When are sunrise and sunset in September in West Chester?
How many hours of sunshine does West Chester have in September?
What is the UV index reading in September in West Chester?
Average temperature in September
West Chester, IA
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (82°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 (65.1°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in September
West Chester, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
West Chester, IA
- Average wind speed in September: 7.9mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
West Chester, IA
- Average humidity in September: 76%
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
West Chester, IA
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is May (2.91").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days in September
West Chester, IA
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (4.2 days).
Average snowfall in September
West Chester, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.52").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
West Chester, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
West Chester, 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 3min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in September
West Chester, IA
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (10.9 days).
Average UV index in September
West Chester, 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
West Chester, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 29).
Average visibility in September
West Chester, 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).
West Chester, Iowa, USA
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