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
Flat Rock's average high-temperature marks a still moderately hot 77.9°F (25.5°C) with the advent of September, closely mirroring that of the preceding month. An average minimum temperature of 59.5°F (15.3°C) is recorded in Flat Rock during the month of September.Humidity
In September, the average relative humidity in Flat Rock is 75%.Rainfall
September is the month with the least rainfall. Rain falls for 12.6 days and accumulates 1.89" (48mm) of precipitation.Snowfall
In Flat Rock, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 26min.On the first day of September in Flat Rock, sunrise is at 6:20 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:34 pm CDT.
Sunshine
The average sunshine in September in Flat Rock is 8.9h.UV index
In Flat Rock, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the UV index of 5 transforms into the following advice:
Guard yourself - Precautionary measures against sun damage are advocated. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Frequently asked questions
What is the usual temperature for Flat Rock in September?
What is the average humidity in September in Flat Rock?
What is the driest month in Flat Rock?
How many days does it rain in September in Flat Rock?
When it does not snow in Flat Rock?
How many hours of daylight does Flat Rock have in September?
When is the sunrise / sunset in September in Flat Rock?
How many hours of sunshine does Flat Rock have in September?
What is the UV index intensity in September in Flat Rock?
Average temperature in September
Flat Rock, IL
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in September: 59.5°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Flat Rock, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Flat Rock, IL
- Average wind speed in September: 6.7mph
The windiest months (with the highest average wind speed) are January and February (10mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity in September
Flat Rock, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Flat Rock, IL
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is April (5.2").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in September
Flat Rock, IL
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (8.4 days).
Average snowfall in September
Flat Rock, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Flat Rock, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Flat Rock, IL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in September
Flat Rock, IL
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is May (9.7 days).
Average UV index in September
Flat Rock, IL
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Flat Rock, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Flat Rock, 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).
Flat Rock, Illinois, USA
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