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
September indicates a minor shift in the average high-temperature, from August's moderately hot 79.9°F (26.6°C) to a still warm 73.6°F (23.1°C). September nights in Crestwood, Illinois, experience a consistent temperature drop to a moderate 59.2°F (15.1°C).Humidity
The average relative humidity in September is 75%.Rainfall
In September, the rain falls for 13.5 days. Throughout September, 1.97" (50mm) of precipitation is accumulated. In Crestwood, during the entire year, the rain falls for 147.7 days and collects up to 23.62" (600mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In Crestwood, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:17 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:33 pm CDT.
Sunshine
In Crestwood, the average sunshine in September is 9.1h.UV index
In Crestwood, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Make use of precautions - It is urged to ward off sun damage. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. 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
What is the temperature in September in Crestwood?
What is the average humidity in September in Crestwood?
How much does it rain in Crestwood in September?
When it does not snow in Crestwood?
Does it snow in Crestwood in September?
How many hours of daylight does Crestwood have in September?
What time are sunrise and sunset in September in Crestwood?
How many hours of sunshine does Crestwood have in September?
What is the UV index intensity in September in Crestwood?
Average temperature in September
Crestwood, IL
- Average high temperature in September: 73.6°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (29.5°F).
- Average low temperature in September: 59.2°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 (18.9°F).
Average pressure in September
Crestwood, 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
Crestwood, IL
- Average wind speed in September: 7.7mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Crestwood, 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
Crestwood, IL
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is December (1.02").
Average rainfall days in September
Crestwood, IL
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in September
Crestwood, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.07").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Crestwood, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 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
Crestwood, IL
- Average daylight in September: 12h and 3min
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: 9h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Crestwood, IL
- Average sunshine days in September: 13 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in September
Crestwood, IL
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Crestwood, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Crestwood, 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).
Crestwood, Illinois, USA
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