Weather in Porto in August 2025
- August is usually the hottest month of the year in Porto;
Average weather
Average temperature in Porto in August
Going from a maximum of +90°F during the day to a minimum of +55°F during the night, the temperature in August averages around +77°F.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +77°F to +77°F.
Is Porto warm or cold in August?
Porto is typically warm in August.
Maximum temperatures go up compared to the previous month from +75°F to +75°F. The minimum temperature also goes up from +63°F to +63°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is the hottest month in Porto, here is the comparison with other months:
Water temperature in Porto in August
Water in Porto in August is Fresh. It varies from +61°F to +67°F, with an average of +64°F. The air temperature averaging +75°F is higher than the water temperature.
The water temperature in August is one of the warmest of the entire year:
Can you swim in Porto in August?
Climate in Porto in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +75°F | +75°F | +73°F | ||||
| Min. temperature | ||||||
| +50°F | +50°F | +45°F | ||||
| Max. temperature | ||||||
| +100°F | +100°F | +97°F | ||||
| Rainfall | ||||||
| 14 mm | 18 mm | 55 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +63°F | +64°F | +65°F | ||||
| Humidity | ||||||
| 76% | 77% | 77% | ||||
| Air pressure | ||||||
| 1016 HPa | 1016 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 14 | 14 | 12 | ||||
| Cloudy days | ||||||
| 10 | 11 | 8 | ||||
| Rainy days | ||||||
| 6 | 5 | 9 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as good as in July. The temperature levels stay the same in the area of +75°F for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 14 mm to 18 mm. Humidity rises from 76% to 77%. The average wind speed doesn’t change much during August, staying around 2 m/s. The amount of sunny days stay about the same, averaging 14 sunny days during the month.
September brings much the same weather, it remains good.
Wind
The average wind speed is 4 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Porto is gradually increasing during August, going from 2 m/s to 4 m/s over the course of the month.
Rain
How was the weather last August in Porto?
Climate Change Over the Years
The climate in Porto in August has not changed that much over the last 43 years.
The average temperature was the lowest in 1979 (+63°F) and the highest in 2022 (+67°F). The driest year was 2007 with only 565 mm of rainfall, and the wettest year was 2022 with 1854 mm.
FAQ
Is August a good time to visit Porto?
Can you sunbathe in Porto in August?
Can you swim in Porto in August?
Is Porto rainy in August?
Is it sunny in Porto in August?
Other cities in Portugal
Monthly weather in Porto
Source of the data
For this page, we’ve looked at the typical weather in Porto, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.