September weather forecastManchester, IL
September
Weather in September
September, the first month of the autumn in Manchester, is still a warm month, with an average temperature varying between 78.1°F (25.6°C) and 59.2°F (15.1°C).Temperature
With September's onset, the weather reveals a slight temperature decrease, transitioning from 83.5°F (28.6°C) in August to a still moderately hot 78.1°F (25.6°C). In Manchester, September nights witness a steady temperature drop to a refreshing 59.2°F (15.1°C).Humidity
In September, the average relative humidity is 74%.Rainfall
In Manchester, in September, during 11 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. Throughout the year, there are 127.3 rainfall days, and 17.24" (438mm) of precipitation is accumulated.Snowfall
In Manchester, snow does not fall in May through October.Daylight
In Manchester, the average length of the day in September is 12h and 26min.On the first day of September in Manchester, sunrise is at 6:30 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm CDT.
Sunshine
In September, the average sunshine is 9.4h.UV index
In Manchester, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Manchester, IL
- Average high temperature in September: 78.1°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (34.3°F).
- Average low temperature in September: 59.2°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure in September
Manchester, IL
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Manchester, IL
- Average wind speed in September: 6.7mph
The windiest months (with the highest average wind speed) are January, February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in September
Manchester, IL
- Average humidity in September: 74%
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Manchester, IL
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is June (2.44").
The driest months (with the least rainfall) are January and November (0.83").
Average rainfall days in September
Manchester, IL
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (5.5 days).
Average snowfall in September
Manchester, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Manchester, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.2 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
Manchester, IL
- Average daylight in September: 12h and 24min
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 24min).
- Average sunshine in September: 9h and 24min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in September
Manchester, IL
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is December (20.6 days).
The month with the least sunshine days is July (12.3 days).
Average UV index in September
Manchester, 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
Manchester, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in September
Manchester, 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).
