September weather forecastJustice, IL
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Justice, Illinois, with an average temperature fluctuating between 74.1°F (23.4°C) and 58.6°F (14.8°C).Temperature
Justice in September experiences a gentle temperature dip, with average high-temperatures reducing from 80.6°F (27°C) in August to a still moderately hot 74.1°F (23.4°C). During the month of September, the nighttime temperature in Justice falls to an average of 58.6°F (14.8°C).Humidity
The average relative humidity in September in Justice is 75%.Rainfall
In September, the rain falls for 15 days. Throughout September, 2.68" (68mm) of precipitation is accumulated. In Justice, during the entire year, the rain falls for 166.8 days and collects up to 34.96" (888mm) of precipitation.Snowfall
May through September are months without snowfall in Justice.Daylight
The average length of the day in September in Justice, Illinois, is 12h and 28min.On the first day of September, sunrise is at 6:18 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:34 pm CDT.
Sunshine
In September, the average sunshine in Justice, Illinois, is 8.9h.UV index
The average daily maximum UV index in September in Justice, Illinois, is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a regular UV index of 4 translates into these guidelines:
Be vigilant - Suggestions to stave off sun damage are provided. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Justice, IL
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in September
Justice, 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
Justice, IL
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Justice, 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 (72%).
Average rainfall in September
Justice, IL
- Average rainfall in September: 2.68"
The wettest month (with the highest rainfall) is May (4.61").
The driest months (with the least rainfall) are November and December (1.77").
Average rainfall days in September
Justice, IL
- Average rainfall days in September: 15 days
The month with the highest number of rainy days is June (19.4 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in September
Justice, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Justice, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.3 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
Justice, 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 12min).
- Average sunshine in September: 8h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Justice, IL
- Average sunshine days in September: 11.9 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is June (8.2 days).
Average UV index in September
Justice, IL
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Justice, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Justice, IL
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
