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 is marked by a subtle drop in average high-temperatures, transitioning from a moderately hot 77.5°F (25.3°C) in August to an agreeable 72°F (22.2°C). During September, the nighttime temperature averages to a fresh 53.1°F (11.7°C).Humidity
The average relative humidity in September is 81%.Rainfall
In Clinton, in September, during 9.7 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. Throughout the year, there are 117.2 rainfall days, and 12.36" (314mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:21 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:38 pm CDT.
Sunshine
In Clinton, the average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index in Clinton is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: An average maximum UV index of 4 in September leads to these recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Clinton?
What is the average humidity in September in Clinton?
How many days does it rain in September in Clinton?
When it does not snow in Clinton?
Does it snow in Clinton in September?
How many hours of daylight does Clinton have in September?
When are sunrise and sunset in September in Clinton?
How many hours of sunshine does Clinton have in September?
What is the UV index reading in September in Clinton?
Average temperature in September
Clinton, WI
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (25°F).
- Average low temperature in September: 53.1°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).
Average pressure in September
Clinton, WI
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Clinton, WI
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Clinton, WI
- Average humidity in September: 81%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (76%).
Average rainfall in September
Clinton, WI
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is July (1.73").
The driest month (with the least rainfall) is December (0.47").
Average rainfall days in September
Clinton, WI
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is July (15.3 days).
The months with the least rainy days are January and February (3.3 days).
Average snowfall in September
Clinton, WI
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.01").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Clinton, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Clinton, WI
- 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 3min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Clinton, WI
- Average sunshine days in September: 17 days
The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in September
Clinton, WI
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Clinton, WI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are August and September (Cloud cover 35).
Average visibility in September
Clinton, WI
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Clinton, Wisconsin, USA
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