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September Weather in Portbou, Spain

Last updated: August 27, 2025

In September, the average temperature in Portbou, Spain is a pleasant 21°C (70°F). Expect a minimum of 12°C (55°F) and a maximum of 27°C (82°F), creating a comfortable climate for outdoor activities. However, be prepared for 48 mm (1.9 in) of precipitation spread over 7 days, and a typical humidity level of 70% adds a touch of warmth to the air. Enjoy your visit!

September Temperature in Portbou

In September in Portbou, the average temperature is 21°C (70°F). Maximum temperatures can reach 27°C (82°F), while the minimum can drop as low as 12°C (55°F). This moderate climate makes Portbou an ideal destination for travelers seeking pleasant weather.

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

The chart illustrates September temperature patterns in Portbou, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portbou, September typically has an average temperature of 21°C (70°F), with highs reaching up to 27°C (82°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec505254576370757570645752
Data source: Temperature data for Portbou 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 Portbou

In Portbou in September, the total precipitation amount is 48 mm (1.9 in) over a span of 7 days.

September Precipitation Trends in Portbou

The chart displays monthly precipitation patterns in Portbou, 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 Portbou, September typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec61415070402481748948138
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portbou

In Portbou in September, humidity is 70%. With an average temperature of 21°C (70°F), this humidity feels like a warm, muggy embrace, making travel slightly uncomfortable, as the air clings to your skin and can leave you feeling sticky and in need of frequent breaks to cool down.

September Average Humidity in Portbou

This chart illustrates the average monthly humidity levels in Portbou, 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 Portbou is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%77%73%73%71%67%66%63%70%80%84%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portbou

In Portbou in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Portbou.

Maximum UV Index Levels in Portbou for September

The chart shows the monthly maximum UV Index (UVI) for Portbou 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 Portbou typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34579101097532
Data source: Portbou 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 Portbou Compares to Other Months

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

This table compares monthly weather conditions in Portbou, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)61 mm (2.4 inches)82%moderate
February Weather11°C (52°F)41 mm (1.6 inches)77%moderate
March Weather12°C (54°F)50 mm (2.0 inches)73%moderate
April Weather14°C (57°F)70 mm (2.8 inches)73%high
May Weather17°C (63°F)40 mm (1.6 inches)71%very high
June Weather21°C (70°F)24 mm (0.9 inches)67%very high
July Weather24°C (75°F)8 mm (0.3 inches)66%very high
August Weather24°C (75°F)17 mm (0.7 inches)63%very high
September Weather21°C (70°F)48 mm (1.9 inches)70%high
October Weather18°C (64°F)94 mm (3.7 inches)80%moderate
November Weather14°C (57°F)81 mm (3.2 inches)84%moderate
December Weather11°C (53°F)38 mm (1.5 inches)83%low

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