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's arrival comes with a mild decrease in the average high-temperature, moving subtly from 81.9°F (27.7°C) in August to a still moderately hot 75.2°F (24°C). Westfield records an average low of 54.7°F (12.6°C) throughout the nights in September.Humidity
The average relative humidity in September is 70%.Rainfall
In Westfield, in September, during 12.5 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. In Westfield, Iowa, during the entire year, the rain falls for 134.3 days and collects up to 24.45" (621mm) of precipitation.Snowfall
In Westfield, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:52 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:08 pm CDT.
Sunshine
The average sunshine in September is 8.9h.UV index
In Westfield, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Westfield have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Westfield, IA
- Average high temperature in September: 75.2°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (25.7°F).
- Average low temperature in September: 54.7°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in September
Westfield, IA
- Average pressure in September: 29.98"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
Westfield, IA
- Average wind speed in September: 9.1mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).
Average humidity in September
Westfield, IA
- Average humidity in September: 70%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (66%).
Average rainfall in September
Westfield, IA
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is June (3.7").
The driest month (with the least rainfall) is January (0.79").
Average rainfall days in September
Westfield, IA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is June (19.3 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall in September
Westfield, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.62").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Westfield, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Westfield, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 5min
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 24min).
Average sunshine days in September
Westfield, IA
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is June (7.8 days).
Average UV index in September
Westfield, 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
Westfield, 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 July (Cloud cover 26).
Average visibility in September
Westfield, 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).
Westfield, Iowa, USA
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