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September Weather in Chateaulin, France

Last updated: August 23, 2025

In Chateaulin, France, the average temperature in September hovers around 15°C (60°F), creating a mildly pleasant atmosphere. Expect minimums dipping to 5°C (42°F) and maximums reaching up to 31°C (87°F). Rainfall is moderate, with an average precipitation amount of 55 mm (2.2 in) spread over 9 days. The environment is generally quite humid, with an average humidity level of 76%.

September Temperature in Chateaulin

In September in Chateaulin, the average temperature is 15°C (60°F). The maximum can reach 31°C (87°F), and the minimum can be as low as 5°C (42°F). Be sure to pack layers to accommodate the varying temperatures during your travels!

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

The chart illustrates September temperature patterns in Chateaulin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chateaulin, September typically has an average temperature of 15°C (60°F), with highs reaching up to 31°C (87°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec444547515561646360554847
Data source: Temperature data for Chateaulin 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 Chateaulin

In Chateaulin in September, the precipitation amount is 55 mm (2.2 in) over a span of 9 days.

September Precipitation Trends in Chateaulin

The chart displays monthly precipitation patterns in Chateaulin, 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 Chateaulin, September typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec73977847728349585510993138
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chateaulin

In Chateaulin in September humidity is 76%. With an average temperature of 15°C (60°F), this humidity feels like a warm, damp blanket wrapping around you, making outdoor activities a bit more challenging and urging you to stay hydrated while exploring the area.

September Average Humidity in Chateaulin

This chart illustrates the average monthly humidity levels in Chateaulin, 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 Chateaulin is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%85%84%81%77%63%71%76%89%90%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chateaulin

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

Maximum UV Index Levels in Chateaulin for September

The chart shows the monthly maximum UV Index (UVI) for Chateaulin 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 Chateaulin typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986522
Data source: Chateaulin 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 Chateaulin Compares to Other Months

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

This table compares monthly weather conditions in Chateaulin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)73 mm (2.9 inches)89%low
February Weather7°C (46°F)96 mm (3.8 inches)88%moderate
March Weather8°C (48°F)78 mm (3.1 inches)85%moderate
April Weather10°C (51°F)47 mm (1.9 inches)84%high
May Weather13°C (56°F)72 mm (2.8 inches)81%very high
June Weather16°C (61°F)83 mm (3.3 inches)77%very high
July Weather18°C (64°F)49 mm (1.9 inches)63%very high
August Weather17°C (63°F)58 mm (2.3 inches)71%very high
September Weather15°C (60°F)55 mm (2.2 inches)76%high
October Weather13°C (55°F)108 mm (4.3 inches)89%moderate
November Weather9°C (49°F)93 mm (3.6 inches)90%low
December Weather8°C (47°F)138 mm (5.4 inches)90%low

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