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September Weather in Portugalete, Spain

Last updated: August 27, 2025

In September, the average temperature in Portugalete, Spain is a pleasant 18°C (65°F). Expect cool evenings with minimum temperatures dipping to 10°C (50°F), while daytime highs can reach a warm 30°C (86°F). Be prepared for a bit of rain, as the area sees about 81 mm (3.2 in) of precipitation over 12 days. With an average humidity of 77%, the air can feel quite refreshing!

September Temperature in Portugalete

In September in Portugalete, the average temperature is 18°C (65°F). Maximum temperatures can reach up to 30°C (86°F), while minimums can drop as low as 10°C (50°F). This makes Portugalete an ideal destination for travelers looking to enjoy mild weather with opportunities for both warm and cooler activities.

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

The chart illustrates September temperature patterns in Portugalete, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portugalete, September typically has an average temperature of 18°C (65°F), with highs reaching up to 30°C (86°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec465051545863666764595350
Data source: Temperature data for Portugalete 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 Portugalete

In Portugalete in September, the precipitation amount is 81 mm (3.2 in) over a span of 12 days.

September Precipitation Trends in Portugalete

The chart displays monthly precipitation patterns in Portugalete, 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 Portugalete, September typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec117103989282104656281105158154
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portugalete

In Portugalete in September humidity is 77%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace that's both refreshing and slightly stifling, making it essential for travelers to stay hydrated and take frequent breaks to enjoy the vibrant surroundings without feeling overly fatigued.

September Average Humidity in Portugalete

This chart illustrates the average monthly humidity levels in Portugalete, 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 Portugalete is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%83%82%81%81%83%87%82%77%80%83%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portugalete

In Portugalete 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 Portugalete.

Maximum UV Index Levels in Portugalete for September

The chart shows the monthly maximum UV Index (UVI) for Portugalete 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 Portugalete typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24679101097532
Data source: Portugalete 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 Portugalete Compares to Other Months

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

This table compares monthly weather conditions in Portugalete, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)117 mm (4.6 inches)85%low
February Weather10°C (50°F)103 mm (4.0 inches)83%moderate
March Weather10°C (51°F)98 mm (3.9 inches)82%high
April Weather12°C (54°F)92 mm (3.6 inches)81%high
May Weather14°C (58°F)82 mm (3.2 inches)81%very high
June Weather17°C (63°F)103 mm (4.1 inches)83%very high
July Weather19°C (67°F)65 mm (2.6 inches)87%very high
August Weather20°C (67°F)62 mm (2.5 inches)82%very high
September Weather18°C (65°F)81 mm (3.2 inches)77%high
October Weather15°C (59°F)105 mm (4.1 inches)80%moderate
November Weather11°C (53°F)158 mm (6.2 inches)83%moderate
December Weather10°C (50°F)154 mm (6.1 inches)85%low

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