nomadseason

September Weather in Edwardsville, United States

Last updated: June 24, 2025

In September, the average temperature in Edwardsville, United States hovers around 22°C (73°F), making it a delightful time to explore. However, be prepared for a range, as temperatures can dip to a brisk 7°C (45°F) or soar up to a sweltering 34°C (94°F). With an average humidity of 76% and approximately 59 mm (2.3 in) of precipitation spread across 6 days, you might want to pack an umbrella along with your sunglasses!

September Temperature in Edwardsville

In September in Edwardsville, the average temperature is 22°C (73°F). Maximums can reach 34°C (94°F), and minimums can be as low as 7°C (45°F). Prepare for a pleasantly warm climate, ideal for sightseeing and outdoor adventures.

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

The chart illustrates September temperature patterns in Edwardsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Edwardsville, September typically has an average temperature of 22°C (73°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec323547556877807672594439
Data source: Temperature data for Edwardsville generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Edwardsville

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

September Precipitation Trends in Edwardsville

The chart displays monthly precipitation patterns in Edwardsville, 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 Edwardsville, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec788013614415410996130591037562
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Edwardsville

In Edwardsville in September, humidity is 76%. With an average temperature of 22°C (73°F), this humidity feels like a warm embrace that envelops you, making travel both refreshing and slightly steamy, as the air clings warmly to your skin.

September Average Humidity in Edwardsville

This chart illustrates the average monthly humidity levels in Edwardsville, 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 Edwardsville 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 Edwardsville

In Edwardsville 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 Edwardsville.

Maximum UV Index Levels in Edwardsville for September

The chart shows the monthly maximum UV Index (UVI) for Edwardsville 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 Edwardsville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111099653
Data source: Edwardsville 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 Edwardsville Compares to Other Months

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

This table compares monthly weather conditions in Edwardsville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)78 mm (3.1 inches)82%moderate
February Weather2°C (36°F)80 mm (3.2 inches)80%moderate
March Weather8°C (47°F)136 mm (5.4 inches)80%high
April Weather13°C (55°F)144 mm (5.7 inches)80%very high
May Weather20°C (68°F)154 mm (6.1 inches)82%very high
June Weather25°C (77°F)109 mm (4.3 inches)83%extreme
July Weather26°C (80°F)96 mm (3.8 inches)81%very high
August Weather25°C (76°F)130 mm (5.1 inches)80%very high
September Weather22°C (73°F)59 mm (2.3 inches)76%very high
October Weather15°C (59°F)103 mm (4.1 inches)76%high
November Weather7°C (44°F)75 mm (3.0 inches)85%moderate
December Weather4°C (39°F)62 mm (2.4 inches)86%moderate

Compare Edwardsville's Climate with Cities Worldwide