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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 22°C (72°F). Temperatures can vary significantly, dipping as low as 4°C (40°F) and soaring to a sizzling 38°C (100°F). Expect a total precipitation of 59 mm (2.3 in) spread over about 5 days, contributing to an average humidity level of 73%. Enjoy the dynamic weather as you explore!

September Temperature in Belleville

In September in Belleville, the average temperature is 22°C (72°F). Maximums can reach 38°C (100°F), and minimums can be as low as 4°C (40°F). This wide range of 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 22°C (72°F), with highs reaching up to 38°C (100°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec293044536477807772544335
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 precipitation amount is 59 mm (2.3 in) over the course of 5 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 59 mm (2.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec2523804917972799560892337
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 73%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace that can make outdoor activities feel sticky and heavy, so it's best to stay hydrated and take frequent breaks while exploring.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%78%67%70%82%81%80%80%74%71%79%83%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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-2°C (30°F)25 mm (1.0 inches)74%moderate
February Weather-1°C (30°F)23 mm (0.9 inches)78%moderate
March Weather7°C (44°F)80 mm (3.2 inches)67%high
April Weather11°C (53°F)49 mm (1.9 inches)70%very high
May Weather18°C (64°F)179 mm (7.0 inches)82%very high
June Weather25°C (78°F)72 mm (2.8 inches)81%extreme
July Weather27°C (81°F)79 mm (3.1 inches)80%extreme
August Weather25°C (77°F)95 mm (3.7 inches)80%very high
September Weather22°C (72°F)59 mm (2.3 inches)73%very high
October Weather12°C (55°F)88 mm (3.5 inches)71%high
November Weather6°C (43°F)23 mm (0.9 inches)79%moderate
December Weather1°C (35°F)37 mm (1.4 inches)83%moderate

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