Buenos Aires 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
Excellent
Best time to visit: August – May
What is the weather like in Buenos Aires in December?
In December, Buenos Aires is warm: daytime highs average 27 °C, and nights cool down to about 19 °C. The sea averages 23.9 °C – pleasant for swimming. With around 10 hours of sunshine a day, there is plenty of sun. Rain falls on about 8 days, adding up to 83 mm. All in all, December is an excellent month for a holiday in Buenos Aires.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 91 | 91 | 87 |
| Day | 24° | 27° | 28° |
| Night | 16° | 19° | 21° |
| Sea | 22° | 24° | 26° |
| Sun | 10 h | 10 h | 10 h |
| Rain days | 8 | 8 | 8 |
More details for December
- Daylight
- 14 h 27 min05:35 – 20:02
- UV index
- 11 · extremeclear sky, noon (estimate)
- Muggy days
- 8 daysdew point 18 °C or more
- Wind
- 20 km/haverage daily peak
- Cloud cover
- 39 %on average
- Hot days
- 5 days30 °C or more
- Time zone
- UTC−3America/Argentina/Buenos_Aires
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %69 %
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
- Rain jacket or umbrella
Buenos Aires in December: quick answers
Is Buenos Aires hot in December?
Warm rather than hot: in December, daytime highs in Buenos Aires average 27 °C and nights cool to about 19 °C. On about 5 days the thermometer climbs to 30 °C or more.
Can you swim in Buenos Aires in December?
Yes. In December the sea averages 23.9 °C – pleasant for swimming.
Does it rain much in Buenos Aires in December?
Rain falls on about 8 days, adding up to 83 mm.
Buenos Aires month by month
The whole year in Buenos AiresAll destinations: Argentina
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)