Buenos Aires weather in January
Temperature, sea and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Excellent
Best time to visit: September – May
What is the weather like in Buenos Aires in January?
In January, Buenos Aires is hot: daytime highs average 28 °C, and even at night it stays warm at around 21 °C. The sea averages 25.5 °C – pleasant for swimming. With around 9 hours of sunshine a day, there is plenty of sun. Rain falls on about 8 days, adding up to 82 mm. On about 8 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, January is an excellent month for a holiday in Buenos Aires.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 91 | 87 | 89 |
| Day | 27° | 28° | 27° |
| Night | 19° | 21° | 20° |
| Sea | 24° | 26° | 25° |
| Sun | 9 h | 9 h | 9 h |
| Rain days | 8 | 8 | 9 |
More details for January
- Daylight
- 14 h 14 min05:55 – 20:09
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 15 daysdew point 18 °C or more
- Wind
- 20 km/haverage daily peak
- Cloud cover
- 38 %on average
- Hot days
- 8 days30 °C or more
- Time zone
- UTC−3America/Argentina/Buenos_Aires
How the score comes together
- Temperatureweight 50 %89 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %74 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in January
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
Buenos Aires in January: quick answers
Is Buenos Aires hot in January?
Yes. In January, Buenos Aires is hot: daytime highs average 28 °C and nights stay around 21 °C. On about 8 days the thermometer climbs to 30 °C or more.
Can you swim in Buenos Aires in January?
Yes. In January the sea averages 25.5 °C – pleasant for swimming.
Does it rain much in Buenos Aires in January?
Rain falls on about 8 days, adding up to 82 mm.
Buenos Aires month by month
The whole year in Buenos AiresAll destinations: ArgentinaWhere to go in JanuarySea temperature in January
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)