Porto weather in December
December in Porto: cool, soaked, with clean air — a good time to visit.
#12 of 12 months in Porto · #409 of 604 destinations to visit in December · comfort 61/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Porto climate normals — December
| Daytime high | 14°C / 58°F | 🙂 cool |
|---|---|---|
| Nighttime low | 9°C / 48°F | |
| Feels like (high) | 12°C / 54°F | |
| Rainfall | 228 mm / 9 in | ⛈ soaked |
| Rainy days | 18 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 9°C / 49°F | |
| Sunshine | 5.6 h/day | |
| Daylight | 9.3 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 45 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Porto in December — FAQ
- Is December a good time to visit Porto?
- December in Porto: cool, soaked, with clean air — a good time to visit. It ranks #12 of 12 months for Porto on SeasonMap's comfort score (61/100).
- What is the weather like in Porto in December?
- In December, Porto averages a daily high of 14.2°C and a low of 9°C, with about 227.7 mm of rain over roughly 18 rainy days.
- What is the air quality in Porto in December?
- Porto has a mean US Air Quality Index of about 45 in December.