Climate averages 1991–2020
Buenos Aires weather
in January.
A warm, moderately wet month: the warmest and the 6th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
January is a warm month in Buenos Aires: daytime highs average 27.6°C and nights cool to about 20.3°C. By daytime temperature it is the warmest month of the year.
Expect about 83 mm of rain on roughly 7 days, which makes January a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 11 min on an average January day.
The nearest other city in this atlas is Avellaneda (5 km away). In January its highs average 27.9°C, about as warm as Buenos Aires, with 83 mm of rain.
Among the 67 cities listed in Argentina, Buenos Aires ranks 57th of 67 for the warmest January highs and joint 20th of 67 for the driest January (rainfall, lowest first). The mean January high of those 67 cities is 29.0°C; Buenos Aires is 1.4°C cooler than that mean.
From January to February, average highs fall by 1.2°C to 26.4°C, and monthly rainfall rises from 83 mm to 99 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Avellaneda in JanuaryArgentina · 5 kmHigh 27.9°C · Low 20.2°C · 83 mm rain
- Lomas de Zamora in JanuaryArgentina · 16 kmHigh 28.2°C · Low 19.6°C · 87 mm rain
- Quilmes in JanuaryArgentina · 16 kmHigh 27.9°C · Low 19.9°C · 83 mm rain
- Isidro Casanova in JanuaryArgentina · 22 kmHigh 28.8°C · Low 19.3°C · 87 mm rain
- Berazategui in JanuaryArgentina · 23 kmHigh 27.5°C · Low 20.2°C · 83 mm rain
- Laferrere in JanuaryArgentina · 24 kmHigh 28.9°C · Low 19.1°C · 87 mm rain
- Don Torcuato in JanuaryArgentina · 26 kmHigh 28.4°C · Low 19.7°C · 90 mm rain
- Bella Vista in JanuaryArgentina · 29 kmHigh 29.0°C · Low 19.2°C · 90 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.