September weather forecastCreve Coeur, IL
September
Weather in September
September, the first month of the autumn in Creve Coeur, is still a warm month, with temperature in the range of an average low of 57.2°F (14°C) and an average high of 76.1°F (24.5°C).Temperature
September's presence marks an average high-temperature of a still moderately hot 76.1°F (24.5°C), subtly varied from August's 81.1°F (27.3°C). An average low-temperature of 57.2°F (14°C) is common during the nights of September.Humidity
In Creve Coeur, the average relative humidity in September is 76%.Rainfall
In Creve Coeur, in September, during 10.5 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. In Creve Coeur, during the entire year, the rain falls for 129.2 days and collects up to 17.24" (438mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 27min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:41 pm CDT.
Sunshine
In September, the average sunshine is 9.3h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: A maximum high UV index of 5 in September translates into the following recommendations:
Act with care - The need to guard against sun damage is communicated. When the Sun is at its strongest around midday, find shade and limit exposure. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Creve Coeur, IL
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in September: 57.2°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Creve Coeur, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Creve Coeur, IL
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Creve Coeur, IL
- Average humidity in September: 76%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Creve Coeur, IL
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is May (2.64").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days in September
Creve Coeur, IL
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in September
Creve Coeur, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.36").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Creve Coeur, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9 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
Creve Coeur, IL
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 18min
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 0min).
Average sunshine days in September
Creve Coeur, IL
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in September
Creve Coeur, 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
Creve Coeur, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in September
Creve Coeur, 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).
