Porto Alegre weather in December
December in Porto Alegre: hot, rainy, with clean air — an excellent time to visit.
#8 of 12 months in Porto Alegre · #271 of 897 destinations to visit in December · comfort 81/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Porto Alegre in December
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Porto Alegre climate normals — December
| Daytime high | 29°C / 84°F | 🥵 hot |
|---|---|---|
| Nighttime low | 19°C / 67°F | |
| Rainfall | 81 mm / 3.2 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 19°C / 65°F | |
| Sunshine | 11.5 h/day | |
| Daylight | 14 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Porto Alegre in December — FAQ
- Is December a good time to visit Porto Alegre?
- December in Porto Alegre: hot, rainy, with clean air — an excellent time to visit. It ranks #8 of 12 months for Porto Alegre on SeasonMap's comfort score (81/100).
- What is the weather like in Porto Alegre in December?
- In December, Porto Alegre averages a daily high of 29.1°C and a low of 19.4°C, with about 81.1 mm of rain over roughly 9.6 rainy days.
- What is the air quality in Porto Alegre in December?
- Porto Alegre has a mean US Air Quality Index of about 39 in December.