September weather forecastArlington, IL
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Arlington, Illinois, with an average temperature fluctuating between 74.1°F (23.4°C) and 55.8°F (13.2°C).Temperature
The transition into September is marked with an average high-temperature of a still moderately hot 74.1°F (23.4°C), showing an insignificant shift from August's 79.2°F (26.2°C). An average low-temperature of 55.8°F (13.2°C) is recorded in the month of September.Humidity
In Arlington, the average relative humidity in September is 79%.Rainfall
In Arlington, in September, it is raining for 8.5 days, with typically 0.71" (18mm) of accumulated precipitation. In Arlington, Illinois, during the entire year, the rain falls for 107.9 days and collects up to 9.96" (253mm) of precipitation.Snowfall
May through September are months without snowfall in Arlington, Illinois.Daylight
In Arlington, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:53 am and sunset at 6:39 pm CDT.
Sunshine
In September, the average sunshine in Arlington is 8.6h.UV index
In September, the average daily maximum UV index in Arlington, Illinois, is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. Avoiding the Sun during its peak radiation time around midday is a healthy practice. 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
Arlington, IL
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in September
Arlington, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Arlington, IL
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Arlington, IL
- Average humidity in September: 79%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Arlington, IL
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is May (1.42").
The driest months (with the least rainfall) are January, February, November and December (0.51").
Average rainfall days in September
Arlington, IL
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (3.6 days).
Average snowfall in September
Arlington, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.98").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Arlington, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.6 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
Arlington, IL
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 36min
The months with the most sunshine are June, July and August (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Arlington, IL
- Average sunshine days in September: 19.4 days
The month with the most sunshine days is December (21.8 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in September
Arlington, IL
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Arlington, IL
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in September
Arlington, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
