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
As August makes way for September, Smithfield's average high-temperature eases from 82°F (27.8°C) to a still moderately hot 76.6°F (24.8°C). Smithfield, in September, experiences an average temperature of 57.6°F (14.2°C) at night.Humidity
The average relative humidity in September is 75%.Rainfall
In Smithfield, Illinois, in September, it is raining for 11 days, with typically 2.09" (53mm) of accumulated precipitation. In Smithfield, during the entire year, the rain falls for 131.7 days and collects up to 22.48" (571mm) of precipitation.Snowfall
May through September are months without snowfall in Smithfield.Daylight
The average length of the day in September in Smithfield is 12h and 27min.On the first day of September, sunrise is at 6:29 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm CDT.
Sunshine
In September, the average sunshine is 9.3h.UV index
The average daily maximum UV index in September in Smithfield is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 4 suggests this advice:
Take measures. Individuals with light skin might experience burns in under 30 minutes. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Frequently asked questions
What are the temperatures in Smithfield in September?
What is the average humidity in September in Smithfield?
How many days does it rain in September in Smithfield?
When it does not snow in Smithfield?
Does it snow in Smithfield in September?
What is the average length of the day in September in Smithfield?
When are sunrise and sunset in September in Smithfield?
How long on average sun shines in September in Smithfield?
What is the UV index reading in September in Smithfield?
Average temperature in September
Smithfield, IL
- Average high temperature in September: 76.6°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in September: 57.6°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).
Average pressure in September
Smithfield, IL
- Average pressure in September: 30.02"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
Smithfield, IL
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in September
Smithfield, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Smithfield, IL
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is December (0.94").
Average rainfall days in September
Smithfield, IL
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is February (4.7 days).
Average snowfall in September
Smithfield, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.35").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Smithfield, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.4 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
Smithfield, 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 18min).
- Average sunshine in September: 9h and 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Smithfield, IL
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in September
Smithfield, IL
- Average UV index in September: 4
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
Smithfield, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in September
Smithfield, 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).
Smithfield, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location
