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 average high-temperature shows a slight dip in September, from August's 85.5°F (29.7°C) to a still warm 79.7°F (26.5°C). Nighttime temperatures in September average to a refreshing 60.1°F (15.6°C) in Vergennes.Humidity
In Vergennes, the average relative humidity in September is 74%.Rainfall
In Vergennes, during September, the rain falls for 11.6 days and regularly aggregates up to 1.73" (44mm) of precipitation. Throughout the year, in Vergennes, there are 147.6 rainfall days, and 29.17" (741mm) of precipitation is accumulated.Snowfall
In Vergennes, snow does not fall in May through October.Daylight
In Vergennes, the average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 6:27 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:41 pm CDT.
Sunshine
In Vergennes, the average sunshine in September is 9.2h.UV index
In Vergennes, Illinois, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A typical high UV index of 5 in September suggests the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Frequently asked questions
What are the temperatures in Vergennes in September?
What is the average humidity in September in Vergennes?
How many days does it rain in September in Vergennes?
When it does not snow in Vergennes?
How many hours of daylight does Vergennes have in September?
What time are sunrise and sunset in September in Vergennes?
How many hours of sunshine does Vergennes have in September?
What is the UV index intensity in September in Vergennes?
Average temperature in September
Vergennes, IL
- Average high temperature in September: 79.7°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in September: 60.1°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in September
Vergennes, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Vergennes, IL
- Average wind speed in September: 6.3mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in September
Vergennes, IL
- Average humidity in September: 74%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Vergennes, IL
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is April (3.58").
The driest month (with the least rainfall) is January (1.5").
Average rainfall days in September
Vergennes, IL
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is December (8.2 days).
Average snowfall in September
Vergennes, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Vergennes, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.4 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
Vergennes, IL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in September
Vergennes, IL
- Average sunshine days in September: 16.7 days
The months with the most sunshine days are October and November (19.5 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in September
Vergennes, IL
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Vergennes, IL
- Average cloud cover in September: 29
The months with the most cloud cover are January and February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in September
Vergennes, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Vergennes, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location
