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
Gurnee observes a small decrease in the average high-temperature with the arrival of September, falling from August's warm 77°F (25°C) to an agreeable 70.9°F (21.6°C). Gurnee, in September, experiences an average temperature of 58.5°F (14.7°C) at night.Humidity
The average relative humidity in September is 77%.Rainfall
In Gurnee, during September, the rain falls for 12.7 days and regularly aggregates up to 1.73" (44mm) of precipitation. Throughout the year, in Gurnee, there are 142.5 rainfall days, and 21.5" (546mm) of precipitation is accumulated.Snowfall
In Gurnee, snow does not fall in May through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:34 pm CDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: A typical high UV index of 4 in September suggests the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
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?
How many hours of daylight does Gurnee have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Gurnee have in September?
What is the UV index intensity in September?
Average temperature in September
Gurnee, IL
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in September: 58.5°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in September
Gurnee, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Gurnee, IL
- Average wind speed in September: 8.8mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in September
Gurnee, IL
- Average humidity in September: 77%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in September
Gurnee, IL
- Average rainfall in September: 1.73"
The wettest months (with the highest rainfall) are June and August (2.68").
The driest month (with the least rainfall) is December (0.91").
Average rainfall days in September
Gurnee, IL
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in September
Gurnee, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Gurnee, 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
Gurnee, 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 6min).
- Average sunshine in September: 9h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Gurnee, IL
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in September
Gurnee, 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
Gurnee, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Gurnee, 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).
Gurnee, Illinois, USA
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