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August Weather in Porto, Spain

Last updated: August 27, 2025

In August, the average temperature in Porto, Spain hovers around 18°C (64°F), with a minimum of 4°C (39°F) and a maximum reaching up to 32°C (89°F). Expect around 34 mm (1.3 in) of precipitation spread over 5 days, contributing to an average humidity of 78%. Stay prepared for a delightful mix of warmth and occasional showers!

August Temperature in Porto

In August in Porto, the average temperature is 18°C (64°F). Maximums can reach 32°C (89°F), and minimums can be as low as 4°C (39°F). This makes it an ideal time for travelers seeking pleasant weather and a variety of outdoor activities.

August Weather in Porto: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Porto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Porto, August typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (89°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec384143475459646459524341
Data source: Temperature data for Porto 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.

August Precipitation in Porto

In Porto in August, the precipitation amount is 34 mm (1.3 in) over the course of 5 days.

August Precipitation Trends in Porto

The chart displays monthly precipitation patterns in Porto, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Porto, August typically receives around 34 mm (1.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec811231351201009449347199142182
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Porto

In Porto in August, humidity is 78%. With an average temperature of 18°C (64°F), this humidity feels like a warm, thick blanket wrapping around you, making traveling feel a bit sticky and sluggish, yet the coolness of the air tempers the intensity, inviting you to explore at a leisurely pace.

August Average Humidity in Porto

This chart illustrates the average monthly humidity levels in Porto, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Porto is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%83%83%84%84%86%78%77%82%86%87%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Porto

In Porto in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Porto.

Maximum UV Index Levels in Porto for August

The chart shows the monthly maximum UV Index (UVI) for Porto in August, 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 August, the maximum UV index in Porto typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24689111098632
Data source: Porto August 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 August Weather in Porto Compares to Other Months

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

This table compares monthly weather conditions in Porto, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)80 mm (3.2 inches)87%low
February Weather5°C (41°F)123 mm (4.8 inches)85%moderate
March Weather6°C (43°F)135 mm (5.3 inches)83%high
April Weather9°C (48°F)120 mm (4.7 inches)83%very high
May Weather12°C (54°F)100 mm (4.0 inches)84%very high
June Weather15°C (59°F)94 mm (3.7 inches)84%extreme
July Weather18°C (64°F)49 mm (1.9 inches)86%very high
August Weather18°C (64°F)34 mm (1.3 inches)78%very high
September Weather15°C (59°F)71 mm (2.8 inches)77%very high
October Weather11°C (53°F)99 mm (3.9 inches)82%high
November Weather6°C (43°F)142 mm (5.6 inches)86%moderate
December Weather5°C (41°F)182 mm (7.2 inches)87%low

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