September weather forecastHarwood Heights, IL
September
Weather in September
September, the first month of the autumn in Harwood Heights, is also an agreeable month, with an average temperature varying between 72.3°F (22.4°C) and 59.9°F (15.5°C).Temperature
Harwood Heights's progression into September involves a minor drop in the average high-temperature, slightly receding from a moderately hot 79.2°F (26.2°C) in August to a pleasant 72.3°F (22.4°C). Throughout September, Harwood Heights's nights cool down to an average of 59.9°F (15.5°C).Humidity
In Harwood Heights, the average relative humidity in September is 74%.Rainfall
In Harwood Heights, in September, it is raining for 9.4 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, there are 98.2 rainfall days, and 7.36" (187mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Harwood Heights, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:34 pm CDT.
Sunshine
The average sunshine in September in Harwood Heights is 8.9h.UV index
In Harwood Heights, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, a daily UV index of 4 turns into the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. 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
Average temperature in September
Harwood Heights, IL
- Average high temperature in September: 72.3°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in September: 59.9°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Harwood 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
Harwood Heights, IL
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in September
Harwood Heights, IL
- Average humidity in September: 74%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Harwood Heights, IL
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is May (1.06").
The driest month (with the least rainfall) is December (0.31").
Average rainfall days in September
Harwood Heights, IL
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is May (12.3 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in September
Harwood Heights, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Harwood Heights, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Harwood Heights, 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 54min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Harwood Heights, IL
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is December (23.3 days).
The month with the least sunshine days is June (14.7 days).
Average UV index in September
Harwood Heights, IL
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Harwood 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 28).
Average visibility in September
Harwood Heights, 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).
