September weather forecastSaint Anne, IL
September
Weather in September
September, the first month of the autumn in Saint Anne, is still a warm month, with an average temperature fluctuating between 74.8°F (23.8°C) and 56.8°F (13.8°C).Temperature
The shift to September signals an average high-temperature of a still moderately hot 74.8°F (23.8°C), subtly varied from August's 79.7°F (26.5°C). During September nights, Saint Anne records an average temperature of 56.8°F (13.8°C).Humidity
In Saint Anne, the average relative humidity in September is 78%.Rainfall
In Saint Anne, Illinois, in September, during 11.6 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. Throughout the year, there are 132 rainfall days, and 15.16" (385mm) of precipitation is accumulated.Snowfall
In Saint Anne, snow does not fall in May through October.Daylight
In Saint Anne, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:22 pm. On the last day of September, in Saint Anne, sunrise is at 6:47 am and sunset at 6:33 pm CDT.
Sunshine
The average sunshine in September in Saint Anne is 8.7h.UV index
In Saint Anne, Illinois, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In September, a daily UV index of 5 turns into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint Anne, IL
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (30°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in September
Saint Anne, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Saint Anne, IL
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
Saint Anne, IL
- Average humidity in September: 78%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Saint Anne, IL
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the least rainfall) is February (0.67").
Average rainfall days in September
Saint Anne, IL
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is July (15.7 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in September
Saint Anne, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.42").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Saint Anne, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.3 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
Saint Anne, IL
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 42min
The months with the most sunshine are June, July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Saint Anne, IL
- Average sunshine days in September: 15.4 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is July (10.7 days).
Average UV index in September
Saint Anne, IL
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Saint Anne, IL
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Saint Anne, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
