Climate averages 1991–2020
Buenos Aires weather
in December.
A warm, moderately wet month: the 3rd warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Buenos Aires: daytime highs average 26.3°C and nights cool to about 18.6°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 87 mm of rain on roughly 8 days, which makes December a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 25 min on an average December day.
The nearest other city in this atlas is Avellaneda (5 km away). In December its highs average 26.7°C, about as warm as Buenos Aires, with 81 mm of rain.
Among the 67 cities listed in Argentina, Buenos Aires ranks 57th of 67 for the warmest December highs and joint 30th of 67 for the driest December (rainfall, lowest first). The mean December high of those 67 cities is 27.9°C; Buenos Aires is 1.5°C cooler than that mean.
From December to January, average highs rise by 1.3°C to 27.6°C, and monthly rainfall falls from 87 mm to 83 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Buenos Aires climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.6°C20.3°C | 20.3°C | 83 | 6.9 | 14.214 h |
| February | 26.4°C19.7°C | 19.7°C | 99 | 8.1 | 13.413 h |
| March | 24.5°C18.1°C | 18.1°C | 96 | 7.6 | 12.312 h |
| April | 20.9°C14.6°C | 14.6°C | 102 | 8.1 | 11.211 h |
| May | 17.2°C11.5°C | 11.5°C | 72 | 6.8 | 10.310 h |
| June | 14.3°C8.6°C | 8.6°C | 74 | 7.7 | 9.910 h |
| July | 13.3°C7.5°C | 7.5°C | 74 | 7.1 | 10.110 h |
| August | 15.5°C8.8°C | 8.8°C | 71 | 6.6 | 10.811 h |
| September | 17.3°C10.4°C | 10.4°C | 80 | 7.1 | 11.812 h |
| October | 20.2°C13.3°C | 13.3°C | 119 | 9.8 | 12.913 h |
| November | 23.4°C15.9°C | 15.9°C | 95 | 8.2 | 13.914 h |
| December, selected | 26.3°C18.6°C | 18.6°C | 87 | 8.1 | 14.414 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Avellaneda in DecemberArgentina · 5 kmHigh 26.7°C · Low 18.5°C · 81 mm rain
- Lomas de Zamora in DecemberArgentina · 16 kmHigh 26.9°C · Low 17.9°C · 85 mm rain
- Quilmes in DecemberArgentina · 16 kmHigh 26.6°C · Low 18.1°C · 81 mm rain
- Isidro Casanova in DecemberArgentina · 22 kmHigh 27.5°C · Low 17.5°C · 85 mm rain
- Berazategui in DecemberArgentina · 23 kmHigh 26.1°C · Low 18.4°C · 81 mm rain
- Laferrere in DecemberArgentina · 24 kmHigh 27.6°C · Low 17.4°C · 85 mm rain
- Don Torcuato in DecemberArgentina · 26 kmHigh 27.1°C · Low 18.0°C · 92 mm rain
- Bella Vista in DecemberArgentina · 29 kmHigh 27.7°C · Low 17.5°C · 92 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Buenos Aires) is explained once on the Buenos Aires year overview and on the Sources, method and limits page.