September weather forecastSycamore, IL
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Sycamore, Illinois, with an average temperature varying between 73°F (22.8°C) and 54.5°F (12.5°C).Temperature
September signals a slight drop in average high-temperature, sliding from August's warm 78.4°F (25.8°C) to a pleasant 73°F (22.8°C). Sycamore experiences a steady low-temperature of 54.5°F (12.5°C) throughout September.Humidity
The average relative humidity in September in Sycamore, Illinois, is 80%.Rainfall
In Sycamore, during September, the rain falls for 12.2 days and regularly aggregates up to 2.24" (57mm) of precipitation. In Sycamore, during the entire year, the rain falls for 152.6 days and collects up to 32.09" (815mm) of precipitation.Snowfall
June through September are months without snowfall in Sycamore.Daylight
The average length of the day in September is 12h and 28min.On the first day of September in Sycamore, sunrise is at 6:21 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:37 pm CDT.
Sunshine
In September, the average sunshine is 8.5h.UV index
The average daily maximum UV index in September in Sycamore is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sycamore, IL
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in September
Sycamore, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Sycamore, IL
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Sycamore, IL
- Average humidity in September: 80%
The months with the highest relative humidity are January and July (85%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in September
Sycamore, IL
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is February (1.65").
Average rainfall days in September
Sycamore, IL
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (4.7 days).
Average snowfall in September
Sycamore, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.55").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Sycamore, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sycamore, IL
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Sycamore, IL
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is November (17.2 days).
The months with the least sunshine days are June and July (10.3 days).
Average UV index in September
Sycamore, IL
- Average UV index in September: 4
The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Sycamore, IL
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 35).
Average visibility in September
Sycamore, IL
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
