Buenos Aires weather in January
In January, Buenos Aires has an average high of 28 °C82 °F and an average low of 22 °C71 °F, with about 104 mm4.1 in of precipitation. January is the warmest month of the year and ranks 4th for precipitation.
How January compares with other months
Compared with December, January is 1.7 °C3 °F warmer on average and wetter by 10 mm0.4 in. Compared with February, January is 0.7 °C1.3 °F warmer on average and drier by 17 mm0.7 in. Daylight lasts about 14.2 hours around the middle of the month. Average relative humidity is 68% and the average cloud amount 45%.
Is January a good time to visit Buenos Aires?
Yes — January 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 January
For Buenos Aires in January, pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
January in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Buenos Aires | 2882 | 2271 | 1044.1 |
| Berazategui | 3087 | 1865 | 1034.1 |
| Laferrere | 3289 | 1763 | 1034.1 |
| Merlo | 3189 | 1865 | 1104.3 |
| La Plata | 3087 | 1865 | 1034.1 |
| Montevideo | 2679 | 2068 | 1024.0 |
| San Nicolás de los Arroyos | 3290 | 1865 | 1305.1 |
| Rosario | 3391 | 1966 | 1234.8 |
| Tandil | 3085 | 1457 | 953.8 |
Nearby places that are more than 1 °C1.8 °F warmer in January: 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 January?
In January the average high in Buenos Aires is 28 °C (82 °F) and the average low is 22 °C (71 °F).
Does it rain a lot in Buenos Aires in January?
On average about 104 mm (4.1 in) of precipitation falls in January; it ranks 4th of the 12 months.
Is January the warmest month in Buenos Aires?
Yes. January is the warmest month in Buenos Aires. The coldest month is July, with an average low of 9 °C (48 °F).
How long is the day in Buenos Aires in January?
In the middle of January the day in Buenos Aires lasts about 14.2 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Buenos Aires in January?
The average relative humidity in January is about 68%. This is a long-term average for the whole day.
How cloudy is Buenos Aires in January?
On average about 45% of the sky is covered by cloud in January. 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.