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September Weather in Richelieu, France

Last updated: August 23, 2025

In Richelieu, France, the average temperature in September hovers around 18°C (65°F). However, expect fluctuations, with minima dipping to 5°C (41°F) and maxima soaring up to 36°C (96°F). During this month, precipitation typically amounts to 31 mm (1.2 in) spread over 7 days, while average humidity remains relatively high at 76%.

September Temperature in Richelieu

In September in Richelieu, the average temperature is 18°C (65°F), with maximums reaching up to 36°C (96°F) and minimums dropping as low as 5°C (41°F). This makes it essential for travelers to pack layers to accommodate both the warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Richelieu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Richelieu, September typically has an average temperature of 18°C (65°F), with highs reaching up to 36°C (96°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec424548535967707064564745
Data source: Temperature data for Richelieu 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 Richelieu

In Richelieu in September, the precipitation amount is 31 mm (1.2 in) over the course of 7 days.

September Precipitation Trends in Richelieu

The chart displays monthly precipitation patterns in Richelieu, 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 Richelieu, September typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec546771477879312731767993
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Richelieu

In Richelieu in September, humidity is 76%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making travel a little sticky but enjoyable, as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Richelieu

This chart illustrates the average monthly humidity levels in Richelieu, 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 Richelieu is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%85%84%83%79%71%68%76%87%91%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Richelieu

In Richelieu in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Richelieu, you can refer to this Hourly UV Index in Richelieu.

Maximum UV Index Levels in Richelieu for September

The chart shows the monthly maximum UV Index (UVI) for Richelieu 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 Richelieu typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986422
Data source: Richelieu 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 Richelieu Compares to Other Months

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

This table compares monthly weather conditions in Richelieu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)54 mm (2.1 inches)90%low
February Weather7°C (45°F)67 mm (2.6 inches)88%moderate
March Weather9°C (49°F)71 mm (2.8 inches)85%moderate
April Weather12°C (54°F)47 mm (1.9 inches)83%high
May Weather15°C (60°F)78 mm (3.1 inches)83%very high
June Weather19°C (67°F)79 mm (3.1 inches)79%very high
July Weather21°C (71°F)31 mm (1.2 inches)71%very high
August Weather21°C (70°F)27 mm (1.1 inches)68%very high
September Weather18°C (65°F)31 mm (1.2 inches)76%high
October Weather14°C (57°F)76 mm (3.0 inches)87%moderate
November Weather8°C (47°F)79 mm (3.1 inches)91%low
December Weather7°C (45°F)93 mm (3.7 inches)93%low

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