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 onset records a minor alteration in the average high-temperature to a still moderately hot 75.7°F (24.3°C) from August's 79.7°F (26.5°C). During September, Fairbury sees a mean low-temperature of 57.2°F (14°C).Humidity
In September, the average relative humidity in Fairbury, Illinois, is 76%.Rainfall
In September, the rain falls for 10.5 days. Throughout September, 1.18" (30mm) of precipitation is accumulated. Throughout the year, in Fairbury, there are 130.5 rainfall days, and 17.44" (443mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall in Fairbury.Daylight
In September, the average length of the day in Fairbury is 12h and 27min.On the first day of the month, sunrise is at 6:21 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:37 pm CDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
In Fairbury, Illinois, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 4 during September translates into the following directions:
Undertake protective steps - Preventing sun damage is advised. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. 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 Fairbury in September?
What is the average humidity in September in Fairbury?
How many days does it rain in September in Fairbury?
When it does not snow in Fairbury?
Does it snow in Fairbury in September?
What is the average length of the day in September in Fairbury?
When are sunrise and sunset in September in Fairbury?
How many hours of sunshine does Fairbury have in September?
What is the UV index intensity in September in Fairbury?
Average temperature in September
Fairbury, IL
- Average high temperature in September: 75.7°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in September: 57.2°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in September
Fairbury, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Fairbury, IL
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in September
Fairbury, IL
- Average humidity in September: 76%
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Fairbury, IL
- Average rainfall in September: 1.18"
The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is January (0.79").
Average rainfall days in September
Fairbury, IL
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is May (17 days).
The months with the least rainy days are January and February (5 days).
Average snowfall in September
Fairbury, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.09").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Fairbury, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.6 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
Fairbury, IL
- Average daylight in September: 12h and 3min
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: 8h and 5min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Fairbury, IL
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in September
Fairbury, IL
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Fairbury, IL
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in September
Fairbury, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Fairbury, Illinois, USA
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