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September Weather in Montreuil, France

Last updated: August 23, 2025

In September, the average temperature in Montreuil, France is a comfortable 18°C (65°F). Expect a range where the minimum dips to 5°C (40°F) and the maximum peaks at 34°C (94°F). While you enjoy the pleasant weather, be prepared for some occasional showers, as 41 mm (1.6 in) of precipitation may fall over 8 days. Don't forget to stay hydrated, as the average humidity is a notable 75%!

September Temperature in Montreuil

In September in Montreuil, the average temperature is 18°C (65°F). Maximums can reach 34°C (94°F), and minimums can be as low as 5°C (40°F). This variation in temperature makes Montreuil an ideal destination for travelers seeking a mix of pleasant daytime warmth and cooler evenings.

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

The chart illustrates September temperature patterns in Montreuil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Montreuil, September typically has an average temperature of 18°C (65°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec434649546066706964574845
Data source: Temperature data for Montreuil 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 Montreuil

In Montreuil in September, the total precipitation amount is 41 mm (1.6 in) occurring over the course of 8 days.

September Precipitation Trends in Montreuil

The chart displays monthly precipitation patterns in Montreuil, 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 Montreuil, September typically receives around 41 mm (1.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec6074835079712729418889123
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Montreuil

In Montreuil in September, humidity is 75%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket that can make outdoor exploration feel a bit stifling, potentially leading to discomfort during travel activities.

September Average Humidity in Montreuil

This chart illustrates the average monthly humidity levels in Montreuil, 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 Montreuil is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%84%83%81%75%65%67%75%85%88%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Montreuil

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

Maximum UV Index Levels in Montreuil for September

The chart shows the monthly maximum UV Index (UVI) for Montreuil 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 Montreuil typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986532
Data source: Montreuil 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 Montreuil Compares to Other Months

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

This table compares monthly weather conditions in Montreuil, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)60 mm (2.4 inches)88%low
February Weather8°C (46°F)74 mm (2.9 inches)87%moderate
March Weather9°C (49°F)82 mm (3.2 inches)84%moderate
April Weather12°C (54°F)50 mm (2.0 inches)83%high
May Weather15°C (60°F)79 mm (3.1 inches)81%very high
June Weather19°C (67°F)71 mm (2.8 inches)75%very high
July Weather21°C (70°F)27 mm (1.1 inches)65%very high
August Weather20°C (69°F)29 mm (1.2 inches)67%very high
September Weather18°C (65°F)41 mm (1.6 inches)75%high
October Weather14°C (57°F)88 mm (3.5 inches)85%moderate
November Weather9°C (48°F)88 mm (3.5 inches)88%moderate
December Weather7°C (46°F)123 mm (4.8 inches)90%low

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