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September Weather in Longjumeau, France

Last updated: August 23, 2025

In September, the average temperature in Longjumeau, France is a comfortable 17°C (62°F). Expect some variability, with lows of 4°C (40°F) and highs reaching up to 34°C (93°F). This month typically sees 49 mm (1.9 in) of precipitation spread across 8 days, while the average humidity hovers around 76%, creating a pleasantly mild atmosphere for outdoor activities.

September Temperature in Longjumeau

In September in Longjumeau, the average temperature is 17°C (62°F), with maximums reaching 34°C (93°F) and minimums dropping to 4°C (40°F). It's advisable to pack layers to comfortably adapt to the varying temperatures during your travels.

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

The chart illustrates September temperature patterns in Longjumeau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Longjumeau, September typically has an average temperature of 17°C (62°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec404347525866696862554643
Data source: Temperature data for Longjumeau 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 Longjumeau

In Longjumeau in September, the precipitation amount is 49 mm (1.9 in) spread over 8 days.

September Precipitation Trends in Longjumeau

The chart displays monthly precipitation patterns in Longjumeau, 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 Longjumeau, September typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec5767743476745160497965102
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Longjumeau

In Longjumeau in September, humidity is 76%. With an average temperature of 17°C (62°F), this humidity feels like a warm, enveloping embrace, making travel feel slightly more challenging as it can lead to a sticky discomfort, especially during outdoor excursions.

September Average Humidity in Longjumeau

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

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

Maximum UV Index Levels in Longjumeau for September

The chart shows the monthly maximum UV Index (UVI) for Longjumeau 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 Longjumeau typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689886421
Data source: Longjumeau 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 Longjumeau Compares to Other Months

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

This table compares monthly weather conditions in Longjumeau, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)57 mm (2.2 inches)91%low
February Weather6°C (43°F)67 mm (2.6 inches)89%moderate
March Weather8°C (47°F)74 mm (2.9 inches)85%moderate
April Weather11°C (52°F)33 mm (1.3 inches)84%high
May Weather14°C (58°F)75 mm (3.0 inches)82%very high
June Weather19°C (66°F)74 mm (2.9 inches)80%very high
July Weather20°C (69°F)51 mm (2.0 inches)73%very high
August Weather20°C (68°F)60 mm (2.3 inches)68%very high
September Weather17°C (62°F)49 mm (1.9 inches)76%high
October Weather13°C (55°F)79 mm (3.1 inches)88%moderate
November Weather8°C (46°F)65 mm (2.6 inches)92%low
December Weather6°C (43°F)102 mm (4.0 inches)93%low

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