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September Weather in Mennecy, France

Last updated: August 23, 2025

In September, the average temperature in Mennecy, France hovers around 17°C (63°F), with a minimum dipping to 5°C (40°F) and a maximum soaring to 35°C (95°F). Expect approximately 54 mm (2.1 in) of precipitation spread over 8 days, and enjoy an average humidity level of 76%.

September Temperature in Mennecy

In September in Mennecy, the average temperature is 17°C (63°F), with maximums reaching up to 35°C (95°F) and minimums dropping as low as 5°C (40°F). This variation in temperature makes it essential for travelers to pack accordingly, ensuring a comfortable experience regardless of the weather fluctuations.

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

The chart illustrates September temperature patterns in Mennecy, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mennecy, September typically has an average temperature of 17°C (63°F), with highs reaching up to 35°C (95°F) and lows dropping to around 5°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec404347525866706863554643
Data source: Temperature data for Mennecy 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 Mennecy

In Mennecy in September, the total precipitation amount reaches 54 mm (2.1 in) over a span of 8 days.

September Precipitation Trends in Mennecy

The chart displays monthly precipitation patterns in Mennecy, 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 Mennecy, September typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec5966723074664652547965102
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mennecy

In Mennecy in September humidity is 76%. With an average temperature of 17°C (63°F), this humidity feels like traveling through a warm, enveloping blanket, making every outdoor adventure feel sticky and heavy, yet pleasantly refreshing when you find a cool breeze.

September Average Humidity in Mennecy

This chart illustrates the average monthly humidity levels in Mennecy, 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 Mennecy is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%82%80%73%68%76%88%92%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mennecy

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

Maximum UV Index Levels in Mennecy for September

The chart shows the monthly maximum UV Index (UVI) for Mennecy 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 Mennecy typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986421
Data source: Mennecy 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 Mennecy Compares to Other Months

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

This table compares monthly weather conditions in Mennecy, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)59 mm (2.3 inches)91%low
February Weather6°C (43°F)66 mm (2.6 inches)89%moderate
March Weather8°C (47°F)72 mm (2.8 inches)85%moderate
April Weather11°C (52°F)30 mm (1.2 inches)84%high
May Weather15°C (58°F)74 mm (2.9 inches)82%very high
June Weather19°C (66°F)66 mm (2.6 inches)80%very high
July Weather21°C (70°F)46 mm (1.8 inches)73%very high
August Weather20°C (69°F)52 mm (2.0 inches)68%very high
September Weather17°C (63°F)54 mm (2.1 inches)76%high
October Weather13°C (55°F)79 mm (3.1 inches)88%moderate
November Weather8°C (46°F)65 mm (2.5 inches)92%low
December Weather6°C (43°F)102 mm (4.0 inches)93%low

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