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
Mascoutah experiences a subtle adjustment in high-temperatures to a still moderately hot 79.2°F (26.2°C) with the onset of September, maintaining near parity with August's 84.2°F (29°C). Mascoutah encounters an average low-temperature of 59.9°F (15.5°C) during September nights.Humidity
The average relative humidity in September is 75%.Rainfall
In September, the rain falls for 9.6 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. In Mascoutah, Illinois, during the entire year, the rain falls for 110.1 days and collects up to 11.1" (282mm) of precipitation.Snowfall
In Mascoutah, snow does not fall in April through October.Daylight
In September, the average length of the day is 12h and 25min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:43 pm CDT.
Sunshine
The average sunshine in September in Mascoutah is 9.3h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. To protect against the Sun's most potent rays, avoid direct exposure around midday. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Mascoutah?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Mascoutah, IL
- Average high temperature in September: 79.2°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in September: 59.9°F
The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in September
Mascoutah, IL
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Mascoutah, IL
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).
Average humidity in September
Mascoutah, IL
- Average humidity in September: 75%
The months with the highest relative humidity are May, July and August (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Mascoutah, IL
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is May (1.5").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in September
Mascoutah, IL
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is July (13.2 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in September
Mascoutah, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.51").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Mascoutah, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.7 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
Mascoutah, IL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Mascoutah, IL
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is January (23.2 days).
The month with the least sunshine days is July (15.4 days).
Average UV index in September
Mascoutah, IL
- Average UV index in September: 5
The months with the highest UV index are May, 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
Mascoutah, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility in September
Mascoutah, 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).
Mascoutah, Illinois, USA
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