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September Weather in Belleville, United States

Last updated: June 24, 2025

In September, the average temperature in Belleville, United States hovers around 19°C (67°F). Expect a chill, with minimum temperatures dipping to 2°C (37°F), while highs can soar to 33°C (92°F). Prepare for some rain, as 122 mm (4.8 in) of precipitation may fall over approximately 10 days. With an average humidity of 67%, the air can feel quite muggy.

September Temperature in Belleville

In September in Belleville, the average temperature is 19°C (67°F). Maximums can reach 33°C (92°F), and minimums can be as low as 2°C (37°F). This variety in temperatures makes it essential for travelers to pack accordingly for both warm and cool conditions.

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

The chart illustrates September temperature patterns in Belleville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Belleville, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec313440516170767467574135
Data source: Temperature data for Belleville 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 Belleville

In Belleville in September, the total precipitation amount reaches 122 mm (4.8 in) over the course of 10 days.

September Precipitation Trends in Belleville

The chart displays monthly precipitation patterns in Belleville, 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 Belleville, September typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec621029010111292109861221068089
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Belleville

In Belleville in September, humidity is 67%. With an average temperature of 19°C (67°F), this humidity feels like walking through a warm, soft blanket, making sightseeing and outdoor activities a bit more challenging but still enjoyable for those prepared with light clothing and plenty of hydration.

September Average Humidity in Belleville

This chart illustrates the average monthly humidity levels in Belleville, 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 Belleville is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Belleville

In Belleville 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 Belleville.

Maximum UV Index Levels in Belleville for September

The chart shows the monthly maximum UV Index (UVI) for Belleville 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 Belleville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Belleville 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 Belleville Compares to Other Months

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

This table compares monthly weather conditions in Belleville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)62 mm (2.4 inches)89%moderate
February Weather1°C (34°F)102 mm (4.0 inches)90%moderate
March Weather5°C (41°F)90 mm (3.5 inches)89%high
April Weather10°C (51°F)101 mm (4.0 inches)88%very high
May Weather16°C (62°F)112 mm (4.4 inches)80%very high
June Weather21°C (70°F)92 mm (3.6 inches)79%very high
July Weather24°C (76°F)109 mm (4.3 inches)74%very high
August Weather23°C (74°F)86 mm (3.4 inches)64%very high
September Weather19°C (67°F)122 mm (4.8 inches)67%very high
October Weather14°C (57°F)106 mm (4.2 inches)81%high
November Weather5°C (42°F)80 mm (3.2 inches)89%moderate
December Weather2°C (36°F)89 mm (3.5 inches)88%low

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