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September Weather in Fairview Heights, United States

Last updated: June 24, 2025

The average temperature in Fairview Heights, United States during September is a pleasant 23°C (73°F). Visitors can expect a minimum of 8°C (46°F) and a maximum of 34°C (94°F). Rainfall is typically around 59 mm (2.3 in) over 6 days, and the average humidity hovers at a comfortable 76%.

September Temperature in Fairview Heights

In September in Fairview Heights, the average temperature is 23°C (73°F). Maximums can reach 34°C (94°F) and minimums can be as low as 8°C (46°F). This makes it a great time to explore Fairview Heights, but be sure to pack for both warm days and cooler nights.

September Weather in Fairview Heights: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Fairview Heights, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fairview Heights, September typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (94°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec333647566877807773604539
Data source: Temperature data for Fairview Heights 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 Fairview Heights

In Fairview Heights in September, the precipitation amount is 59 mm (2.3 in) over the course of 6 days.

September Precipitation Trends in Fairview Heights

The chart displays monthly precipitation patterns in Fairview Heights, 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 Fairview Heights, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec808313914815810091129591077767
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Fairview Heights

In Fairview Heights in September humidity is 76%. With an average temperature of 23°C (73°F), this humidity feels like a warm, enveloping blanket, making outdoor activities feel more intense and prompting travelers to seek shade or cool breaks more frequently.

September Average Humidity in Fairview Heights

This chart illustrates the average monthly humidity levels in Fairview Heights, 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 Fairview Heights is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fairview Heights

In Fairview Heights in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Fairview Heights.

Maximum UV Index Levels in Fairview Heights for September

The chart shows the monthly maximum UV Index (UVI) for Fairview Heights 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 Fairview Heights typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110109753
Data source: Fairview Heights 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 Fairview Heights Compares to Other Months

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

This table compares monthly weather conditions in Fairview Heights, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (33°F)80 mm (3.2 inches)82%moderate
February Weather2°C (36°F)83 mm (3.3 inches)80%moderate
March Weather9°C (48°F)139 mm (5.5 inches)80%high
April Weather13°C (56°F)148 mm (5.8 inches)80%very high
May Weather20°C (68°F)158 mm (6.2 inches)82%very high
June Weather25°C (77°F)100 mm (4.0 inches)83%extreme
July Weather27°C (80°F)91 mm (3.6 inches)81%very high
August Weather25°C (77°F)129 mm (5.1 inches)80%very high
September Weather23°C (73°F)59 mm (2.3 inches)76%very high
October Weather15°C (60°F)107 mm (4.2 inches)76%high
November Weather7°C (45°F)77 mm (3.0 inches)85%moderate
December Weather4°C (40°F)67 mm (2.7 inches)86%moderate

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