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September Weather in Fairbury, United States

Last updated: June 24, 2025

In September, the average temperature in Fairbury, United States hovers around 22°C (71°F). However, brace yourself for a temperature range that can dip to a brisk 5°C (41°F) and soar up to a sizzling 37°C (99°F). During this month, expect approximately 75 mm (3.0 in) of precipitation spread over 7 days, accompanied by an average humidity level of 75%.

September Temperature in Fairbury

In September in Fairbury, the average temperature is 22°C (71°F). The maximum can reach 37°C (99°F), while the minimum can drop as low as 5°C (41°F). This diverse range of temperatures makes Fairbury a great destination for travelers seeking both warm and cooler weather experiences.

September Weather in Fairbury: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Fairbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fairbury, September typically has an average temperature of 22°C (71°F), with highs reaching up to 37°C (99°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec282843526477807671544234
Data source: Temperature data for Fairbury generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Fairbury

In Fairbury in September, the precipitation amount is 75 mm (3.0 in) over a span of 7 days.

September Precipitation Trends in Fairbury

The chart displays monthly precipitation patterns in Fairbury, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Fairbury, September typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec29249248170945990761062536
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Fairbury

In Fairbury in September, humidity is 75%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making traveling a bit sticky but also invigorating, as the air surrounds you with a heavy yet refreshing sensation that highlights the vibrant atmosphere of your surroundings.

September Average Humidity in Fairbury

This chart illustrates the average monthly humidity levels in Fairbury, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Fairbury is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fairbury

In Fairbury in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Fairbury.

Maximum UV Index Levels in Fairbury for September

The chart shows the monthly maximum UV Index (UVI) for Fairbury in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Fairbury typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111198643
Data source: Fairbury September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Fairbury Compares to Other Months

Weather in Fairbury varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Fairbury, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Fairbury, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)29 mm (1.1 inches)76%moderate
February Weather-2°C (28°F)24 mm (1.0 inches)80%moderate
March Weather6°C (43°F)92 mm (3.6 inches)73%high
April Weather11°C (52°F)48 mm (1.9 inches)74%very high
May Weather18°C (64°F)170 mm (6.7 inches)78%very high
June Weather25°C (77°F)94 mm (3.7 inches)82%extreme
July Weather26°C (80°F)59 mm (2.3 inches)83%extreme
August Weather24°C (76°F)90 mm (3.6 inches)80%very high
September Weather22°C (71°F)75 mm (3.0 inches)75%very high
October Weather12°C (54°F)106 mm (4.2 inches)75%high
November Weather5°C (42°F)25 mm (1.0 inches)82%moderate
December Weather1°C (34°F)36 mm (1.4 inches)83%moderate

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