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
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a warm 81.1°F (27.3°C) in August to a still moderately hot 74.1°F (23.4°C). Nighttime temperatures consistently average a moderate 58.1°F (14.5°C) during September.Humidity
The average relative humidity in September is 74%.Rainfall
In Lombard, in September, during 13.2 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. Throughout the year, there are 147.3 rainfall days, and 23.86" (606mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Lombard, the average length of the day in September is 12h and 28min.On the first day of September, 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 September, the average sunshine is 8.7h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 4 during September translates into the following guidance:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Lombard, IL
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in September
Lombard, 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
Lombard, IL
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in September
Lombard, 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 (72%).
Average rainfall in September
Lombard, IL
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is December (1.14").
Average rainfall days in September
Lombard, IL
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is February (5.5 days).
Average snowfall in September
Lombard, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.62").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Lombard, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lombard, 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 4min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Lombard, IL
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is July (10.2 days).
Average UV index in September
Lombard, 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
Lombard, IL
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in September
Lombard, 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).
Lombard, Illinois, USA
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