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
Entering September, the average high-temperature is recorded at a still moderately hot 79.3°F (26.3°C), exhibiting a minimal shift from August's 84.6°F (29.2°C). Throughout September, Smithton experiences a low-temperature average of 60.1°F (15.6°C).Humidity
The average relative humidity in September is 75%.Rainfall
The month with the least rainfall is September, when the rain falls for 8.1 days and typically collects 0.47" (12mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 6:30 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:43 pm CDT.
Sunshine
The average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 5 suggests these recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
What is the driest month?
How much does it rain in Smithton in September?
When it does not snow?
How many hours of daylight does Smithton have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Smithton have in September?
What is the UV index intensity in September?
Average temperature in September
Smithton, IL
- Average high temperature in September: 79.3°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.1°F).
- Average low temperature in September: 60.1°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25°F).
Average pressure in September
Smithton, IL
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Smithton, IL
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).
Average humidity in September
Smithton, IL
- Average humidity in September: 75%
The months with the highest relative humidity are May and July (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Smithton, IL
- Average rainfall in September: 0.47"
The wettest month (with the highest rainfall) is May (1.34").
The driest month (with the least rainfall) is September (0.47").
Average rainfall days in September
Smithton, IL
- Average rainfall days in September: 8.1 days
The month with the highest number of rainy days is July (12.2 days).
The month with the least rainy days is December (5.3 days).
Average snowfall in September
Smithton, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.63").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Smithton, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Smithton, IL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in September
Smithton, IL
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is January (23.3 days).
The month with the least sunshine days is July (15.1 days).
Average UV index in September
Smithton, IL
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Smithton, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are June, July and August (Cloud cover 28).
Average visibility in September
Smithton, 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).
Smithton, Illinois, USA
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