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September Weather in Les Islettes, France

Last updated: August 23, 2025

In September, the average temperature in Les Islettes, France is a pleasant 16°C (61°F). Expect a minimum of 5°C (41°F) and occasional peaks reaching up to 34°C (93°F). With an average precipitation of 70 mm (2.8 in) spread over 9 days, you might want to keep an umbrella handy. Additionally, average humidity levels are quite high at 81%, creating a humid atmosphere.

September Temperature in Les Islettes

In September in Les Islettes, the average temperature is 16°C (61°F), with maximums reaching 34°C (93°F) and minimums dropping to as low as 5°C (41°F). This temperature range makes Les Islettes an ideal destination for travelers seeking both warm days and cool nights.

September Weather in Les Islettes: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Les Islettes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Les Islettes, September typically has an average temperature of 16°C (61°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec374145515766686861544441
Data source: Temperature data for Les Islettes 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 Les Islettes

In Les Islettes in September, the total precipitation amount is 70 mm (2.8 in) spread over 9 days.

September Precipitation Trends in Les Islettes

The chart displays monthly precipitation patterns in Les Islettes, 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 Les Islettes, September typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9887953780676564708780151
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Les Islettes

In Les Islettes in September, humidity is 81%. With an average temperature of 16°C (61°F), this humidity feels like a warm, heavy blanket wrapping around you as you explore the sights, making it essential to stay hydrated and take regular breaks in the shade.

September Average Humidity in Les Islettes

This chart illustrates the average monthly humidity levels in Les Islettes, 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 Les Islettes is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%84%83%83%80%76%81%88%92%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Les Islettes

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

Maximum UV Index Levels in Les Islettes for September

The chart shows the monthly maximum UV Index (UVI) for Les Islettes 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 Les Islettes typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234688886421
Data source: Les Islettes 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 Les Islettes Compares to Other Months

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

This table compares monthly weather conditions in Les Islettes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)98 mm (3.9 inches)91%low
February Weather5°C (42°F)87 mm (3.4 inches)89%moderate
March Weather7°C (45°F)95 mm (3.7 inches)86%moderate
April Weather11°C (51°F)37 mm (1.5 inches)84%high
May Weather14°C (57°F)80 mm (3.1 inches)82%very high
June Weather19°C (66°F)67 mm (2.6 inches)82%very high
July Weather20°C (69°F)65 mm (2.6 inches)80%very high
August Weather20°C (68°F)64 mm (2.5 inches)76%very high
September Weather16°C (61°F)70 mm (2.8 inches)81%high
October Weather12°C (54°F)87 mm (3.4 inches)88%moderate
November Weather7°C (44°F)80 mm (3.1 inches)92%low
December Weather5°C (41°F)151 mm (5.9 inches)93%low

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