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September Weather in Longueil, France

Last updated: August 23, 2025

In September, the average temperature in Longueil, France hovers around 16°C (62°F). Expect a minimum of 8°C (47°F) and a pleasant maximum of 26°C (80°F). During this time, precipitation measures approximately 69 mm (2.7 in) over about 12 days, accompanied by an average humidity of 76%. Perfect weather for enjoying the seasonal charm!

September Temperature in Longueil

In September in Longueil, the average temperature is 16°C (62°F). Maximum temperatures can reach 26°C (80°F), while the minimum can drop as low as 8°C (47°F). It's a great time to explore Longueil, so pack accordingly for comfortable outdoor activities!

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

The chart illustrates September temperature patterns in Longueil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Longueil, September typically has an average temperature of 16°C (62°F), with highs reaching up to 26°C (80°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec434447505561646561564946
Data source: Temperature data for Longueil 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 Longueil

In Longueil in September, the precipitation amount is 69 mm (2.7 in) over the span of 12 days.

September Precipitation Trends in Longueil

The chart displays monthly precipitation patterns in Longueil, 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 Longueil, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec787278337666497569104101139
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Longueil

In Longueil in September, humidity is 76%. With an average temperature of 16°C (62°F), this humidity feels like a warm, enveloping blanket that makes exploring the outdoors feel both refreshing and slightly muggy, urging travelers to take breaks often and enjoy the shade.

September Average Humidity in Longueil

This chart illustrates the average monthly humidity levels in Longueil, 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 Longueil 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 Longueil

In Longueil in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Longueil.

Maximum UV Index Levels in Longueil for September

The chart shows the monthly maximum UV Index (UVI) for Longueil 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 Longueil typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234679885421
Data source: Longueil 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 Longueil Compares to Other Months

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

This table compares monthly weather conditions in Longueil, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)77 mm (3.0 inches)91%low
February Weather7°C (45°F)72 mm (2.8 inches)89%moderate
March Weather8°C (47°F)78 mm (3.1 inches)85%moderate
April Weather10°C (50°F)33 mm (1.3 inches)84%high
May Weather13°C (55°F)76 mm (3.0 inches)82%high
June Weather16°C (61°F)66 mm (2.6 inches)80%very high
July Weather18°C (65°F)49 mm (1.9 inches)73%very high
August Weather18°C (65°F)75 mm (2.9 inches)68%very high
September Weather16°C (62°F)69 mm (2.7 inches)76%moderate
October Weather14°C (57°F)104 mm (4.1 inches)88%moderate
November Weather9°C (49°F)101 mm (4.0 inches)92%low
December Weather8°C (46°F)139 mm (5.5 inches)93%low

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