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September Weather in Fairbury, United States

Last updated: June 24, 2025

In Fairbury, United States, the average temperature in September hovers around 21°C (70°F). However, you might experience a minimum of 5°C (41°F) and a high of 35°C (94°F). Precipitation typically reaches 70 mm (2.8 in) across about 8 days, while the average humidity remains high at 80%.

September Temperature in Fairbury

In September in Fairbury, the average temperature is 21°C (70°F). The maximum can reach 35°C (94°F), and the minimum can be as low as 5°C (41°F). Be prepared for warm days and cool nights, making it a great time for outdoor activities and layering your clothing.

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 21°C (70°F), with highs reaching up to 35°C (94°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec272941516474777469564034
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 total precipitation amount is 70 mm (2.8 in), spread over the course of 8 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 70 mm (2.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec64701051161581169397701276155
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 80%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can make even short walks feel draining, urging travelers to seek shade or a cool drink frequently.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098642
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-3°C (27°F)64 mm (2.5 inches)82%moderate
February Weather-2°C (29°F)70 mm (2.8 inches)83%moderate
March Weather5°C (42°F)105 mm (4.1 inches)84%high
April Weather10°C (51°F)116 mm (4.5 inches)85%very high
May Weather18°C (64°F)158 mm (6.2 inches)79%very high
June Weather23°C (74°F)116 mm (4.5 inches)82%extreme
July Weather25°C (77°F)93 mm (3.7 inches)80%very high
August Weather23°C (74°F)97 mm (3.8 inches)81%very high
September Weather21°C (70°F)70 mm (2.8 inches)80%very high
October Weather13°C (56°F)127 mm (5.0 inches)82%high
November Weather5°C (41°F)60 mm (2.4 inches)88%moderate
December Weather1°C (35°F)55 mm (2.2 inches)84%low

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