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 arrival subtly correlates with a reduction in the average high-temperature, down from a warm 79.3°F (26.3°C) in August to an agreeable 72.9°F (22.7°C). Throughout September, the average low-temperature dips to a refreshing 57.2°F (14°C).Humidity
The average relative humidity in September is 77%.Rainfall
In Lake Barrington, in September, it is raining for 13.4 days, with typically 2.2" (56mm) of accumulated precipitation. Throughout the year, there are 163.1 rainfall days, and 32.24" (819mm) of precipitation is accumulated.Snowfall
In Lake Barrington, snow does not fall in June through September.Daylight
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 7:26 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:35 pm CDT.
Sunshine
In Lake Barrington, the average sunshine in September is 9h.UV index
In Lake Barrington, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Lake Barrington?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Lake Barrington have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Lake Barrington have in September?
What is the UV index intensity in September in Lake Barrington?
Average temperature in September
Lake Barrington, IL
- Average high temperature in September: 72.9°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 (27.7°F).
- Average low temperature in September: 57.2°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (16.3°F).
Average pressure in September
Lake Barrington, 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
Lake Barrington, IL
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Lake Barrington, IL
- Average humidity in September: 77%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Lake Barrington, IL
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is June (4.13").
The driest month (with the least rainfall) is November (1.61").
Average rainfall days in September
Lake Barrington, IL
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in September
Lake Barrington, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (6.22").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Lake Barrington, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lake Barrington, 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: 9h and 0min
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
Lake Barrington, IL
- Average sunshine days in September: 13.4 days
The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is June (8.4 days).
Average UV index in September
Lake Barrington, IL
- Average UV index in September: 4
The months with the highest UV index are 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
Lake Barrington, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July, August and September (Cloud cover 31).
Average visibility in September
Lake Barrington, 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).
Lake Barrington, Illinois, USA
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