Porto Alegre weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Good
Best time to visit: February – December
What is the weather like in Porto Alegre in December?
In December, Porto Alegre is hot: daytime highs average 28 °C, and nights cool down to about 19 °C. The sea averages 24.3 °C – pleasant for swimming. The sun shines for around 8 hours a day. Rain is frequent, with about 12 rainy days and 130 mm in total. On about 9 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, December is a good month for a holiday in Porto Alegre.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 80 | 72 | 61 |
| Day | 26° | 28° | 29° |
| Night | 17° | 19° | 21° |
| Sea | 22° | 24° | 26° |
| Sun | 8 h | 8 h | 8 h |
| Rain days | 11 | 12 | 14 |
More details for December
- Daylight
- 14 h 4 min05:18 – 19:22
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 17 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 54 %on averageAll months
- Hot days
- 9 days30 °C or moreAll months
- Time zone
- UTC−3America/Sao_Paulo
How the score comes together
- Temperatureweight 50 %88 %
- Sunshineweight 20 %78 %
- Few rainy daysweight 30 %44 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Porto Alegre in December: quick answers
Is Porto Alegre hot in December?
Yes. In December, Porto Alegre is hot: daytime highs average 28 °C and nights stay around 19 °C. On about 9 days the thermometer climbs to 30 °C or more.
Can you swim in Porto Alegre in December?
Yes. In December the sea averages 24.3 °C – pleasant for swimming.
Does it rain much in Porto Alegre in December?
Rain is frequent, with about 12 rainy days and 130 mm in total.
Porto Alegre month by month
The whole year in Porto AlegreAll destinations: BrazilWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences