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 average high-temperature shows a slight dip in September, from August's 80.4°F (26.9°C) to a still warm 74.1°F (23.4°C). In Lisle, September is marked by an average low-temperature of 57.6°F (14.2°C).Humidity
In September, the average relative humidity in Lisle is 76%.Rainfall
In September, the rain falls for 13.4 days. Throughout September, 1.77" (45mm) of precipitation is accumulated. In Lisle, during the entire year, the rain falls for 147.7 days and collects up to 23.43" (595mm) of precipitation.Snowfall
In Lisle, Illinois, snow does not fall in June through September.Daylight
In Lisle, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:25 pm. On the last day of September, in Lisle, sunrise is at 6:48 am and sunset at 6:35 pm CDT.
Sunshine
The average sunshine in September is 8.8h.UV index
In September, the average daily maximum UV index in Lisle is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Act with care - The need to guard against sun damage is communicated. To protect against the Sun's most potent rays, avoid direct exposure around midday. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Frequently asked questions
What are the temperatures in Lisle in September?
What is the average humidity in September in Lisle?
How much does it rain in Lisle in September?
When it does not snow in Lisle?
Does it snow in Lisle in September?
What is the average length of the day in September in Lisle?
When are sunrise and sunset in September in Lisle?
How many hours of sunshine does Lisle have in September?
What is the UV index intensity in September in Lisle?
Average temperature in September
Lisle, IL
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in September: 57.6°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in September
Lisle, 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
Lisle, IL
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in September
Lisle, IL
- Average humidity in September: 76%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Lisle, IL
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is December (1.1").
Average rainfall days in September
Lisle, IL
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (5.4 days).
Average snowfall in September
Lisle, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Lisle, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lisle, 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 month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Lisle, IL
- Average sunshine days in September: 14.1 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in September
Lisle, 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 January (UV index 1).
Average cloud cover in September
Lisle, IL
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Lisle, 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).
Lisle, Illinois, USA
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