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
The beginning of September in Arlington Heights brings a minor change in the average high-temperature, shifting from a moderately hot 80.1°F (26.7°C) in August to a pleasant 73.2°F (22.9°C). September generally records an average low-temperature of 58.1°F (14.5°C).Humidity
In September, the average relative humidity in Arlington Heights is 74%.Rainfall
In September, the rain falls for 12 days. Throughout September, 1.89" (48mm) of precipitation is accumulated. In Arlington Heights, during the entire year, the rain falls for 142.7 days and collects up to 27.91" (709mm) of precipitation.Snowfall
June through September are months without snowfall in Arlington Heights, Illinois.Daylight
The average length of the day in September in Arlington Heights is 12h and 28min.On the first day of September in Arlington Heights, Illinois, sunrise is at 6:18 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:34 pm CDT.
Sunshine
In Arlington Heights, the average sunshine in September is 8.8h.UV index
In Arlington Heights, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's radiation is especially intense around midday; try to stay in shade during this period. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Arlington Heights?
What is the average humidity in September in Arlington Heights?
How much does it rain in Arlington Heights in September?
When it does not snow in Arlington Heights?
Does it snow in Arlington Heights in September?
What is the average length of the day in September in Arlington Heights?
What time are sunrise and sunset in September in Arlington Heights?
How many hours of sunshine does Arlington Heights have in September?
How high is the UV index in September in Arlington Heights?
Average temperature in September
Arlington Heights, IL
- Average high temperature in September: 73.2°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in September
Arlington Heights, 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
Arlington Heights, IL
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in September
Arlington Heights, IL
- Average humidity in September: 74%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Arlington Heights, IL
- Average rainfall in September: 1.89"
The wettest months (with the highest rainfall) are April and May (3.46").
The driest month (with the least rainfall) is November (1.57").
Average rainfall days in September
Arlington Heights, IL
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in September
Arlington Heights, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.71").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Arlington Heights, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Arlington Heights, IL
- Average daylight in September: 12h and 3min
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 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Arlington Heights, IL
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is February (10.3 days).
Average UV index in September
Arlington Heights, IL
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Arlington Heights, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in September
Arlington Heights, IL
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Arlington Heights, Illinois, USA
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