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
The onset of September results in a small decrease in the average high-temperature, moderately receding from a warm 82.9°F (28.3°C) in August to a still moderately hot 77.5°F (25.3°C). In September, La Prairie's temperature tends to fall to an average low of 58.1°F (14.5°C) during the night.Humidity
In September, the average relative humidity is 75%.Rainfall
In La Prairie, Illinois, in September, during 10.4 rainfall days, 2.4" (61mm) of precipitation is typically accumulated. In La Prairie, during the entire year, the rain falls for 134.2 days and collects up to 23.15" (588mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In La Prairie, Illinois, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:35 pm. On the last day of September, in La Prairie, sunrise is at 7:00 am and sunset at 6:47 pm CDT.
Sunshine
The average sunshine in September in La Prairie is 9.4h.UV index
In September, the average daily maximum UV index in La Prairie is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Frequently asked questions
What are the temperatures in La Prairie in September?
What is the average humidity in September in La Prairie?
How many days does it rain in September in La Prairie?
When it does not snow in La Prairie?
Does it snow in La Prairie in September?
How many hours of daylight does La Prairie have in September?
When is the sunrise / sunset in September in La Prairie?
How long on average sun shines in September in La Prairie?
What is the UV index reading in September in La Prairie?
Average temperature in September
La Prairie, IL
- Average high temperature in September: 77.5°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (32.7°F).
- Average low temperature in September: 58.1°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 (20.1°F).
Average pressure in September
La Prairie, IL
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
La Prairie, IL
- Average wind speed in September: 7.2mph
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 July (6.4mph).
Average humidity in September
La Prairie, IL
- Average humidity in September: 75%
The months with the highest relative humidity are June and July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
La Prairie, IL
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is May (3.35").
The driest months (with the least rainfall) are January and December (1.02").
Average rainfall days in September
La Prairie, IL
- Average rainfall days in September: 10.4 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (5 days).
Average snowfall in September
La Prairie, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.76").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
La Prairie, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.8 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
La Prairie, IL
- Average daylight in September: 12h and 2min
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 24min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
La Prairie, IL
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is December (19.6 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in September
La Prairie, 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
La Prairie, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
La Prairie, 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).
La Prairie, Illinois, USA
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