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, Forest Park experiences a modest temperature adjustment, with the average high-temperature gently receding from a warm 79.3°F (26.3°C) in August to an agreeable 72.1°F (22.3°C). The low-temperature average for Forest Park during September stands at a refreshing 60.4°F (15.8°C).Humidity
In Forest Park, the average relative humidity in September is 74%.Rainfall
In Forest Park, in September, during 14.5 rainfall days, 2.72" (69mm) of precipitation is typically accumulated. Throughout the year, there are 157.8 rainfall days, and 33.7" (856mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Forest Park, Illinois.Daylight
The average length of the day in September in Forest Park is 12h and 28min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:34 pm CDT.
Sunshine
The average sunshine in September is 9h.UV index
In September, the average daily maximum UV index in Forest Park is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Frequently asked questions
What is the temperature in September in Forest Park?
What is the average humidity in September in Forest Park?
How much does it rain in Forest Park in September?
When it does not snow in Forest Park?
Does it snow in Forest Park in September?
What is the average length of the day in September in Forest Park?
When is the sunrise / sunset in September in Forest Park?
How many hours of sunshine does Forest Park have in September?
How high is the UV index in September in Forest Park?
Average temperature in September
Forest Park, IL
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in September: 60.4°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).
Average pressure in September
Forest Park, 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
Forest Park, IL
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Forest Park, IL
- Average humidity in September: 74%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Forest Park, IL
- Average rainfall in September: 2.72"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is December (1.57").
Average rainfall days in September
Forest Park, IL
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in September
Forest Park, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Forest Park, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Forest 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 0min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Forest Park, IL
- Average sunshine days in September: 13.4 days
The month with the most sunshine days is December (16.7 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in September
Forest Park, 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
Forest Park, IL
- Average cloud cover in September: 30
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
Forest 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).
Forest Park, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location
