Monthly climate guide
Porto Alegre weather in December
December in Porto Alegre is typically hot, with average daytime highs around 29°C (83°F) and night-time lows near 18°C (65°F). The month usually brings about 111 mm of rain (wet) and is often cloudy. Daytime highs are 2°C warmer than November and about the same as January.
What stands out in December
- Seasonally, December counts as early summer in Porto Alegre — the seasons are reversed south of the equator.
- December is Porto Alegre's third warmest month.
- Porto Alegre is usually about 2°C warmer than Caxias do Sul, 100 km away, in December.
- It's humid — around 79% — so the heat feels heavier.
Avg high
29°C
83°F
Avg low
18°C
65°F
Rainfall
111 mm
wet
Humidity
79%
relative
Sky
55%
cloud · often cloudy
Porto Alegre weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 30°C / 85°F | 20°C / 68°F | 117 mm | 79% | 59% |
| February | 30°C / 86°F | 20°C / 69°F | 102 mm | 77% | 54% |
| March | 28°C / 83°F | 18°C / 65°F | 110 mm | 78% | 55% |
| April | 26°C / 79°F | 16°C / 61°F | 101 mm | 80% | 58% |
| May | 22°C / 72°F | 13°C / 55°F | 110 mm | 83% | 62% |
| June | 20°C / 67°F | 10°C / 50°F | 114 mm | 85% | 62% |
| July | 19°C / 66°F | 9°C / 49°F | 160 mm | 86% | 59% |
| August | 21°C / 70°F | 11°C / 51°F | 122 mm | 85% | 56% |
| September | 22°C / 72°F | 13°C / 55°F | 143 mm | 84% | 62% |
| October | 24°C / 76°F | 15°C / 58°F | 168 mm | 83% | 64% |
| November | 26°C / 79°F | 16°C / 60°F | 100 mm | 80% | 52% |
| December | 29°C / 83°F | 18°C / 65°F | 111 mm | 79% | 55% |
What to pack for December
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A compact umbrella or packable rain jacket
- Water-resistant shoes
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is December a good time to visit Porto Alegre?
Compare the months in the chart above to find your ideal window.
Best time to visit Porto Alegre →Other Brazil cities in December
Cite or embed this data
Writing about this destination? Copy a ready-made citation or embed a live widget — free, just keep the link.
Porto Alegre weather in December. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/brazil/porto-alegre/december
<a href="https://weathercompare.eu/weather/brazil/porto-alegre/december">Porto Alegre weather in December</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/brazil/porto-alegre" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Porto Alegre weather in December"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/brazil/porto-alegre/december">Porto Alegre weather in December</a> – WeatherCompare</p>
Porto Alegre in December: quick answers
Is December a good time to visit Porto Alegre?
December is one of the wetter months in Porto Alegre, with about 111 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Porto Alegre in December?
Average highs are about 29°C (83°F) and average lows about 18°C (65°F), based on 10 years of daily data.
Does it rain a lot in Porto Alegre in December?
Porto Alegre typically gets around 111 mm of rain in December — wet.
Figures are long-term averages for the area around Porto Alegre (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.