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
Greenville's shift from August to September is accompanied by an average high-temperature of a still moderately hot 77.9°F (25.5°C), a slight deviation from 82.9°F (28.3°C). Greenville, during the month of September, experiences an average low-temperature of 59.5°F (15.3°C).Humidity
In Greenville, the average relative humidity in September is 75%.Rainfall
In September, the rain falls for 11.5 days. Throughout September, 1.5" (38mm) of precipitation is accumulated. Throughout the year, there are 137.9 rainfall days, and 24.88" (632mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:27 pm. On the last day of September, in Greenville, Illinois, sunrise is at 6:53 am and sunset at 6:41 pm CDT.
Sunshine
In Greenville, the average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September in Greenville is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 5 suggests this advice:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Frequently asked questions
What is the average September temperature in Greenville?
What is the average humidity in September in Greenville?
How many days does it rain in September in Greenville?
When it does not snow in Greenville?
How many hours of daylight does Greenville have in September?
What time are sunrise and sunset in September in Greenville?
How long on average sun shines in September in Greenville?
How high is the UV index in September in Greenville?
Average temperature in September
Greenville, IL
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in September: 59.5°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Greenville, 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 (29.92"Hg).
Average wind speed in September
Greenville, IL
- Average wind speed in September: 6.4mph
The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).
Average humidity in September
Greenville, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Greenville, IL
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is June (3.43").
The driest month (with the least rainfall) is February (1.26").
Average rainfall days in September
Greenville, IL
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in September
Greenville, IL
- Average snowfall in September: 0"
The month with the highest snowfall is December (1.89").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Greenville, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.8 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
Greenville, IL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
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 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 30min).
Average sunshine days in September
Greenville, IL
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is December (20 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in September
Greenville, 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
Greenville, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).
Average visibility in September
Greenville, 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).
Greenville, Illinois, USA
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