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September Weather in Chassieu, France

Last updated: August 23, 2025

In Chassieu, France, the average temperature in September hovers around 18°C (65°F). Temperatures can swing from a chilly 5°C (42°F) to a warm 34°C (93°F), offering a diverse climate experience. Expect about 65 mm (2.5 in) of precipitation over 8 days, with an average humidity level of 72%.

September Temperature in Chassieu

In September in Chassieu, the average temperature is 18°C (65°F). The maximum can reach 34°C (93°F) and the minimum can be as low as 5°C (42°F). This makes it a great time to visit, offering warm days for outdoor adventures and cooler evenings for cozy gatherings.

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

The chart illustrates September temperature patterns in Chassieu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chassieu, September typically has an average temperature of 18°C (65°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec384448546170737265564642
Data source: Temperature data for Chassieu 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 Chassieu

In Chassieu in September, the precipitation amount is 65 mm (2.5 in) over a span of 8 days.

September Precipitation Trends in Chassieu

The chart displays monthly precipitation patterns in Chassieu, 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 Chassieu, September typically receives around 65 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec73607747117817568659798136
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chassieu

In Chassieu in September humidity is 72%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace, making traveling somewhat uncomfortable as the air clings to your skin and the heat can be stifling, yet it's perfect for enjoying leisurely strolls under the shade.

September Average Humidity in Chassieu

This chart illustrates the average monthly humidity levels in Chassieu, 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 Chassieu is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%88%84%81%77%76%68%61%72%88%91%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chassieu

In Chassieu 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 Chassieu, you can refer to this Hourly UV Index in Chassieu.

Maximum UV Index Levels in Chassieu for September

The chart shows the monthly maximum UV Index (UVI) for Chassieu 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 Chassieu typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2356810986532
Data source: Chassieu 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 Chassieu Compares to Other Months

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

This table compares monthly weather conditions in Chassieu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)73 mm (2.9 inches)91%low
February Weather6°C (44°F)60 mm (2.4 inches)88%moderate
March Weather9°C (48°F)77 mm (3.0 inches)84%moderate
April Weather12°C (54°F)47 mm (1.9 inches)81%high
May Weather16°C (61°F)117 mm (4.6 inches)77%very high
June Weather21°C (70°F)81 mm (3.2 inches)76%very high
July Weather23°C (74°F)75 mm (3.0 inches)68%very high
August Weather22°C (73°F)68 mm (2.7 inches)61%very high
September Weather18°C (65°F)65 mm (2.5 inches)72%high
October Weather13°C (56°F)97 mm (3.8 inches)88%moderate
November Weather8°C (46°F)98 mm (3.9 inches)91%moderate
December Weather5°C (42°F)136 mm (5.4 inches)92%low

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