Buenos Aires weather in December
In December, Buenos Aires has an average high of 26 °C79 °F and an average low of 20 °C68 °F, with about 94 mm3.7 in of precipitation. It is the 3rd warmest month of the year and ranks 7th for precipitation.
How December compares with other months
Compared with November, December is 2.6 °C4.6 °F warmer on average and drier by 6 mm0.2 in. Compared with January, December is 1.7 °C3 °F cooler on average and drier by 10 mm0.4 in. Daylight lasts about 14.5 hours around the middle of the month. Average relative humidity is 68% and the average cloud amount 43%.
Is December a good time to visit Buenos Aires?
Yes — December is one of the most comfortable months to visit Buenos Aires by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in December
For Buenos Aires in December, pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
December in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Buenos Aires | 2679 | 2068 | 943.7 |
| Berazategui | 2984 | 1661 | 913.6 |
| Laferrere | 3086 | 1560 | 903.5 |
| Merlo | 3086 | 1661 | 973.8 |
| La Plata | 2984 | 1661 | 913.6 |
| Montevideo | 2476 | 1864 | 863.4 |
| San Nicolás de los Arroyos | 3188 | 1661 | 1335.2 |
| Rosario | 3289 | 1763 | 1425.6 |
| Tandil | 2883 | 1254 | 763.0 |
Nearby places that are more than 1 °C1.8 °F warmer in December: Rosario; cooler: Montevideo and Tandil.
Other months in Buenos Aires
- January28 °C82 °F / 22 °C71 °F
- February27 °C80 °F / 21 °C70 °F
- March25 °C76 °F / 19 °C67 °F
- April21 °C70 °F / 16 °C61 °F
- May17 °C63 °F / 13 °C55 °F
- June14 °C58 °F / 10 °C50 °F
- July13 °C56 °F / 9 °C48 °F
- August15 °C59 °F / 10 °C50 °F
- September17 °C62 °F / 12 °C53 °F
- October20 °C68 °F / 14 °C58 °F
- November23 °C74 °F / 17 °C63 °F
- December26 °C79 °F / 20 °C68 °F
Frequently asked questions
How warm is Buenos Aires in December?
In December the average high in Buenos Aires is 26 °C (79 °F) and the average low is 20 °C (68 °F).
Does it rain a lot in Buenos Aires in December?
On average about 94 mm (3.7 in) of precipitation falls in December; it ranks 7th of the 12 months.
Is December the warmest month in Buenos Aires?
No. The warmest month in Buenos Aires is January, with an average high of 28 °C (82 °F). The coldest month is July, with an average low of 9 °C (48 °F).
How long is the day in Buenos Aires in December?
In the middle of December the day in Buenos Aires lasts about 14.5 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Buenos Aires in December?
The average relative humidity in December is about 68%. This is a long-term average for the whole day.
How cloudy is Buenos Aires in December?
On average about 43% of the sky is covered by cloud in December. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.