Last updated: August 27, 2025
In December, the average temperature in Porto, Spain hovers around 5°C (41°F). Expect chilly moments, with minimum temperatures dipping to -6°C (22°F) and occasional warmth peaking at 16°C (61°F). This month typically sees 182 mm (7.2 in) of precipitation over 16 days, contributing to a high average humidity of 87%. Embrace the crisp air and prepare for wet days ahead!
In December in Porto, the average temperature is 5°C (41°F), with a maximum that can reach 16°C (61°F) and a minimum that can drop to -6°C (22°F). Travelers should be prepared for chilly weather, layering options, and possible cold snaps during this time of year.
In Porto in December, the precipitation amount is 182 mm (7.2 in) over the course of 16 days.
In Porto in December humidity is 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.
In Porto in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Porto, you can visit Hourly UV Index in Porto.
UV Risk Categories
Weather in Porto varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Porto, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (38°F) | 80 mm (3.2 inches) | 87% | low |
| February Weather | 5°C (41°F) | 123 mm (4.8 inches) | 85% | moderate |
| March Weather | 6°C (43°F) | 135 mm (5.3 inches) | 83% | high |
| April Weather | 9°C (48°F) | 120 mm (4.7 inches) | 83% | very high |
| May Weather | 12°C (54°F) | 100 mm (4.0 inches) | 84% | very high |
| June Weather | 15°C (59°F) | 94 mm (3.7 inches) | 84% | extreme |
| July Weather | 18°C (64°F) | 49 mm (1.9 inches) | 86% | very high |
| August Weather | 18°C (64°F) | 34 mm (1.3 inches) | 78% | very high |
| September Weather | 15°C (59°F) | 71 mm (2.8 inches) | 77% | very high |
| October Weather | 11°C (53°F) | 99 mm (3.9 inches) | 82% | high |
| November Weather | 6°C (43°F) | 142 mm (5.6 inches) | 86% | moderate |
| December Weather | 5°C (41°F) | 182 mm (7.2 inches) | 87% | low |