September weather forecastEffingham, IL
September
Weather in September
September, the first month of the autumn in Effingham, is also a moderately hot month, with an average temperature ranging between max 77.4°F (25.2°C) and min 59.4°F (15.2°C).Temperature
Effingham's average high-temperature in September sits at a still warm 77.4°F (25.2°C), showing little difference from the previous month. Effingham's September nights cool down to an average low-temperature of 59.4°F (15.2°C).Humidity
The average relative humidity in September in Effingham is 75%.Rainfall
In Effingham, Illinois, in September, during 11.3 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. Throughout the year, in Effingham, there are 135.9 rainfall days, and 21.89" (556mm) of precipitation is accumulated.Snowfall
In Effingham, snow does not fall in May through October.Daylight
In Effingham, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:24 pm. On the last day of September, in Effingham, sunrise is at 6:49 am and sunset at 6:37 pm CDT.
Sunshine
In September, the average sunshine in Effingham is 9.2h.UV index
In Effingham, 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 unsafe exposure to UV radiation for ordinary individuals.Note: In September, an average UV index of 5 transforms into the following instructions:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Effingham, IL
- Average high temperature in September: 77.4°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (35.2°F).
- Average low temperature in September: 59.4°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (23°F).
Average pressure in September
Effingham, 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
Effingham, IL
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is July (6mph).
Average humidity in September
Effingham, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Effingham, IL
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is April (2.83").
The driest month (with the least rainfall) is February (1.06").
Average rainfall days in September
Effingham, IL
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is July (15.2 days).
The month with the least rainy days is January (6.9 days).
Average snowfall in September
Effingham, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.18").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Effingham, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Effingham, 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 30min).
- Average sunshine in September: 9h and 12min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Effingham, IL
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is January (20 days).
The month with the least sunshine days is May (12.9 days).
Average UV index in September
Effingham, 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
Effingham, IL
- Average cloud cover in September: 29
The months with the most cloud cover are January and February (Cloud cover 53).
The months with the least cloud cover are June and September (Cloud cover 29).
Average visibility in September
Effingham, 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).
