September weather forecastAntioch, IL
September
Weather in September
As September dawns upon Antioch, it brings with it welcoming signs of the upcoming fall. The month witnesses the temperatures buttoning down, with the average high dropping to 71.6°F (22°C) from August's 77.5°F (25.3°C), signaling the coming departure of summer's heat. The resurgent rainfall and diminishing sunlight hours set the perfect stage for the autumnal transformation. As the leaves begin to adorn shades of red and gold, the city transitions aesthetically into a different kind of beauty.Temperature
Antioch's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's moderately hot 77.5°F (25.3°C) to a pleasant 71.6°F (22°C). Throughout the month of September, the nighttime temperature in Antioch dips to an average of 55°F (12.8°C).Humidity
The average relative humidity in September in Antioch, Illinois, is 80%.Rainfall
In September, the rain falls for 12.5 days. Throughout September, 1.89" (48mm) of precipitation is accumulated. In Antioch, during the entire year, the rain falls for 139.6 days and collects up to 26.18" (665mm) of precipitation.Snowfall
In Antioch, snow does not fall in June through September.Daylight
In Antioch, the average length of the day in September is 12h and 28min.On the first day of September in Antioch, sunrise is at 6:18 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:35 pm CDT.
Sunshine
The average sunshine in September is 8.9h.UV index
In Antioch, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 4 during September translates into these guidelines:
Put precautions into practice - Ensuring skin and eye safety is a necessity. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Antioch, IL
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure in September
Antioch, IL
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January and February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Antioch, IL
- Average wind speed in September: 7.5mph
The windiest months (with the highest average wind speed) are January and February (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in September
Antioch, IL
- Average humidity in September: 80%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (76%).
Average rainfall in September
Antioch, IL
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is June (3.54").
The driest month (with the least rainfall) is December (1.06").
Average rainfall days in September
Antioch, IL
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is February (3.4 days).
Average snowfall in September
Antioch, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.33").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Antioch, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Antioch, IL
- Average daylight in September: 12h and 30min
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: 8h and 54min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The months with the least sunshine are January and February (Average sunshine: 3h and 36min).
Average sunshine days in September
Antioch, IL
- Average sunshine days in September: 14.6 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in September
Antioch, IL
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Antioch, IL
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July, August and September (Cloud cover 32).
Average visibility in September
Antioch, 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).
