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's arrival registers an average high-temperature of a still warm 77.9°F (25.5°C), closely aligning with the temperature of the previous month. An average temperature of 59.5°F (15.3°C) marks the nights in Smithboro in September.Humidity
In September, the average relative humidity is 75%.Rainfall
In September, in Smithboro, the rain falls for 11.5 days. Throughout September, 1.5" (38mm) of precipitation is accumulated. Throughout the year, in Smithboro, there are 137.9 rainfall days, and 24.88" (632mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall in Smithboro.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:27 pm. On the last day of September, in Smithboro, sunrise is at 6:53 am and sunset at 6:41 pm CDT.
Sunshine
The average sunshine in September in Smithboro, Illinois, is 9.3h.UV index
The average daily maximum UV index in September in Smithboro, Illinois, is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In September, an average UV index of 5 transforms into the following instructions:
Make use of precautions - Suggestions to resist sunburn are communicated. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Smithboro in September?
What is the average humidity in September in Smithboro?
How much does it rain in Smithboro in September?
When it does not snow in Smithboro?
How many hours of daylight does Smithboro have in September?
When is the sunrise / sunset in September in Smithboro?
How long on average sun shines in September in Smithboro?
What is the UV index intensity in September in Smithboro?
Average temperature in September
Smithboro, IL
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in September: 59.5°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Smithboro, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Smithboro, IL
- Average wind speed in September: 6.4mph
The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).
Average humidity in September
Smithboro, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Smithboro, IL
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is June (3.43").
The driest month (with the least rainfall) is February (1.26").
Average rainfall days in September
Smithboro, IL
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in September
Smithboro, IL
- Average snowfall in September: 0"
The month with the highest snowfall is December (1.89").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Smithboro, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.8 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
Smithboro, IL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 30min).
Average sunshine days in September
Smithboro, IL
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is December (20 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in September
Smithboro, 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
Smithboro, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).
Average visibility in September
Smithboro, 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).
Smithboro, Illinois, USA
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