The climate in Porto during December can be summarized as cool and wet.
December is in the winter in Porto and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cool 14°C (57°F), whilst at night 6°C (43°F) is normal.
Daytime temperature | 13.9°C 56.9°F |
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Nightly temperature | 6°C 42.7°F |
Average temperature | 9.9°C 49.8°F |
Daily sunshine | 4.5 hrs |
Avg rainfall | 171 mm 6.7 ins |
Rainy days | 15 days |
Sea temperature | 15.1°C 59.1°F |
Humidity | 81% |
Windspeed | 18.4kph 11 mph |
On average December is the wettest month of the year in Porto with around 171mm 6.7 inches of rain making it a wet time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 4.5 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Porto in December 2025.
Best places to visit in December
Hottest month: | July | 24.8°C 76.6°F |
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Driest month: | July | 15mm 0.6ins |
Sunniest month: | August | 10.3hrs |
Coldest month: | January | 13.3°C 55.9°F |
Wettest month: | December | 171mm 6.7ins |