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 brings a slight decrease in temperature, down from 84.7°F (29.3°C) in August to a still moderately hot 79.2°F (26.2°C). Fayetteville experiences an average nighttime temperature of 60.1°F (15.6°C) in the month of September.Humidity
The average relative humidity in September in Fayetteville is 75%.Rainfall
In Fayetteville, Illinois, in September, during 11.3 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. Throughout the year, in Fayetteville, there are 129.8 rainfall days, and 19.13" (486mm) of precipitation is accumulated.Snowfall
Months with snowfall in Fayetteville, Illinois, are January through March, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Fayetteville, there are 16.2 snowfall days, and 3.19" (81mm) of snow is accumulated.Daylight
In Fayetteville, Illinois, the average length of the day in September is 12h and 25min.On the first day of September in Fayetteville, sunrise is at 6:29 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 6:43 pm CDT.
Sunshine
The average sunshine in September in Fayetteville is 9.3h.UV index
In September, the average daily maximum UV index in Fayetteville is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Frequently asked questions
What are September temperatures in Fayetteville?
What is the average humidity in September in Fayetteville?
How many days does it rain in September in Fayetteville?
When does it start snowing in Fayetteville?
How many hours of daylight does Fayetteville have in September?
When are sunrise and sunset in September in Fayetteville?
How many hours of sunshine does Fayetteville have in September?
What is the UV index reading in September in Fayetteville?
Average temperature in September
Fayetteville, IL
- Average high temperature in September: 79.2°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.3°F).
- Average low temperature in September: 60.1°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in September
Fayetteville, 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
Fayetteville, IL
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).
Average humidity in September
Fayetteville, IL
- Average humidity in September: 75%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Fayetteville, IL
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is May (2.48").
The driest month (with the least rainfall) is February (0.83").
Average rainfall days in September
Fayetteville, IL
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is July (15.1 days).
The months with the least rainy days are January and December (6.5 days).
Average snowfall in September
Fayetteville, IL
- Average snowfall in September: 0.04"
The month with the highest snowfall is January (1.06").
The months with the least snowfall are April, May, June, July and August (0").
Average snowfall days in September
Fayetteville, IL
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (5.6 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Fayetteville, 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 30min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
Fayetteville, IL
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is December (21.7 days).
The month with the least sunshine days is July (13.7 days).
Average UV index in September
Fayetteville, IL
- Average UV index in September: 5
The months with the highest UV index are May, 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
Fayetteville, IL
- Average cloud cover in September: 29
The months with the most cloud cover are January and February (Cloud cover 49).
The months with the least cloud cover are June and August (Cloud cover 27).
Average visibility in September
Fayetteville, 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).
Fayetteville, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location
