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September Weather in Portbail, France

Last updated: August 23, 2025

In Portbail, France, the average temperature in September hovers around 17°C (62°F). Expect a comfortable range with minimums dipping to 10°C (51°F) and maximums peaking at 26°C (79°F). However, be prepared for some rain, as the area receives about 72 mm (2.8 in) of precipitation over 11 days, and the average humidity sits at a notable 79%.

September Temperature in Portbail

In September, in Portbail, the average temperature is 17°C (62°F). The maximum can reach 26°C (79°F), while the minimum can be as low as 10°C (51°F). This pleasant climate makes it an ideal time for travelers to explore the area comfortably.

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

The chart illustrates September temperature patterns in Portbail, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portbail, September typically has an average temperature of 17°C (62°F), with highs reaching up to 26°C (79°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec464648515561646462575148
Data source: Temperature data for Portbail 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 Portbail

In Portbail in September, the precipitation amount is 72 mm (2.8 in) over the course of 11 days.

September Precipitation Trends in Portbail

The chart displays monthly precipitation patterns in Portbail, 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 Portbail, September typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec838080377179547272131102153
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portbail

In Portbail in September humidity is 79%. With an average temperature of 17°C (62°F), this humidity feels like a warm blanket wrapping around you, making strolling through the streets a bit heavier but still comfortably refreshing for travelers.

September Average Humidity in Portbail

This chart illustrates the average monthly humidity levels in Portbail, 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 Portbail is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%89%86%85%80%80%69%73%79%89%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portbail

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

Maximum UV Index Levels in Portbail for September

The chart shows the monthly maximum UV Index (UVI) for Portbail 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 Portbail typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234679886421
Data source: Portbail 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 Portbail Compares to Other Months

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

This table compares monthly weather conditions in Portbail, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)83 mm (3.3 inches)90%low
February Weather8°C (46°F)80 mm (3.1 inches)89%moderate
March Weather9°C (48°F)80 mm (3.1 inches)86%moderate
April Weather11°C (51°F)37 mm (1.5 inches)84%high
May Weather13°C (56°F)71 mm (2.8 inches)80%high
June Weather16°C (61°F)79 mm (3.1 inches)80%very high
July Weather18°C (65°F)54 mm (2.1 inches)69%very high
August Weather18°C (65°F)72 mm (2.8 inches)73%very high
September Weather17°C (62°F)72 mm (2.8 inches)79%high
October Weather14°C (58°F)131 mm (5.2 inches)89%moderate
November Weather11°C (52°F)102 mm (4.0 inches)92%low
December Weather9°C (48°F)153 mm (6.0 inches)92%low

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