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
With the onset of September, Highland Park's climate undergoes a slight change as the average high-temperature moves from a moderately hot 77.5°F (25.3°C) in August to an agreeable 71.2°F (21.8°C). Highland Park, during September, witnesses an average low-temperature of 60.1°F (15.6°C).Humidity
The average relative humidity in September in Highland Park is 75%.Rainfall
In Highland Park, in September, during 13.6 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. In Highland Park, during the entire year, the rain falls for 154.1 days and collects up to 30.24" (768mm) of precipitation.Snowfall
May through September are months without snowfall in Highland Park.Daylight
The average length of the day in September in Highland Park is 12h and 28min.On the first day of September in Highland Park, Illinois, sunrise is at 6:17 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:33 pm CDT.
Sunshine
In Highland Park, the average sunshine in September is 9.2h.UV index
In Highland Park, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 4 during September translates into the following directions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. 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 September temperatures in Highland Park?
What is the average humidity in September in Highland Park?
How many days does it rain in September in Highland Park?
When it does not snow in Highland Park?
Does it snow in Highland Park in September?
How many hours of daylight does Highland Park have in September?
What time are sunrise and sunset in September in Highland Park?
How many hours of sunshine does Highland Park have in September?
What is the UV index intensity in September in Highland Park?
Average temperature in September
Highland Park, IL
- Average high temperature in September: 71.2°F
The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in September: 60.1°F
The months with the highest average low temperature are July and August (66.7°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Highland Park, 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
Highland Park, IL
- Average wind speed in September: 8.9mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).
Average humidity in September
Highland Park, IL
- Average humidity in September: 75%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Highland Park, IL
- Average rainfall in September: 2.6"
The wettest months (with the highest rainfall) are May and June (3.82").
The driest month (with the least rainfall) is December (1.3").
Average rainfall days in September
Highland Park, IL
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in September
Highland Park, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Highland Park, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Highland Park, 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 1min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Highland Park, IL
- Average sunshine days in September: 13.3 days
The month with the most sunshine days is December (15.3 days).
The month with the least sunshine days is April (10.8 days).
Average UV index in September
Highland Park, 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 December (UV index 1).
Average cloud cover in September
Highland Park, IL
- Average cloud cover in September: 29
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 27).
Average visibility in September
Highland Park, 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).
Highland Park, Illinois, USA
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