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September Weather in Saint-Brieuc, France

Last updated: August 23, 2025

In September, the average temperature in Saint-Brieuc, France hovers around 16°C (61°F), with a minimum dipping to 5°C (41°F) and reaching a pleasant maximum of 29°C (85°F). Expect some rainfall, with 44 mm (1.7 in) of precipitation spread over 9 days. Additionally, the average humidity sits at a comfortable 76%, making it an ideal time to explore and enjoy the outdoors!

September Temperature in Saint-Brieuc

In September in Saint-Brieuc, the average temperature is 16°C (61°F). Maximum temperatures can reach 29°C (85°F), while minimums can drop to as low as 5°C (41°F). This variability makes it a great time for travelers to enjoy a mix of mild days and cooler evenings.

September Weather in Saint-Brieuc: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint-Brieuc, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint-Brieuc, September typically has an average temperature of 16°C (61°F), with highs reaching up to 29°C (85°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec444547505561646360554846
Data source: Temperature data for Saint-Brieuc 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 Saint-Brieuc

In Saint-Brieuc in September, the precipitation amount is 44 mm (1.7 in) over the course of 9 days.

September Precipitation Trends in Saint-Brieuc

The chart displays monthly precipitation patterns in Saint-Brieuc, 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 Saint-Brieuc, September typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec476555436597484444996495
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint-Brieuc

In Saint-Brieuc in September humidity is 76%. With an average temperature of 16°C (61°F), this humidity feels like a warm embrace that makes traveling feel slightly heavy yet refreshing, often prompting you to seek shade or indulge in ice-cold drinks to stay comfortable.

September Average Humidity in Saint-Brieuc

This chart illustrates the average monthly humidity levels in Saint-Brieuc, 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 Saint-Brieuc 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 Saint-Brieuc

In Saint-Brieuc 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 Saint-Brieuc, you can refer to this Hourly UV Index in Saint-Brieuc.

Maximum UV Index Levels in Saint-Brieuc for September

The chart shows the monthly maximum UV Index (UVI) for Saint-Brieuc 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 Saint-Brieuc typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986422
Data source: Saint-Brieuc 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 Saint-Brieuc Compares to Other Months

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

This table compares monthly weather conditions in Saint-Brieuc, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)47 mm (1.9 inches)89%low
February Weather7°C (45°F)65 mm (2.6 inches)88%moderate
March Weather8°C (48°F)55 mm (2.2 inches)85%moderate
April Weather10°C (51°F)43 mm (1.7 inches)84%high
May Weather13°C (55°F)65 mm (2.6 inches)81%very high
June Weather16°C (61°F)97 mm (3.8 inches)77%very high
July Weather18°C (64°F)48 mm (1.9 inches)63%very high
August Weather17°C (63°F)44 mm (1.7 inches)71%very high
September Weather16°C (61°F)44 mm (1.7 inches)76%high
October Weather13°C (55°F)99 mm (3.9 inches)89%moderate
November Weather9°C (49°F)64 mm (2.5 inches)90%low
December Weather8°C (47°F)95 mm (3.7 inches)90%low

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