Buenos Aires Weather in January
Argentina · Humid Subtropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
January in Buenos Aires sees average temperatures ranging from a low of 21.0°C (69.8°F) to a high of 28.6°C (83.5°F), with a mean of 24.7°C (76.5°F). Compared to the annual average of 17.6°C (63.7°F), this month is 7.1°C warmer than the yearly norm. This is the hottest month of the year, reaching 28.6°C (83.5°F) on average. Precipitation averages 75.1mm, making it approximately 1.0mm wetter than the monthly average of 74.0mm. The city receives an average of 12.1 hours of sunshine per day during January, with relative humidity averaging 65.6%. Wind speeds reach an average maximum of 25.9 km/h. For travelers, this month offers a hottest month of the year experience in Buenos Aires, with wetter-than-average conditions compared to the rest of the year.
If you're planning outdoor activities in Buenos Aires, the seasons are flipped but mild. I ran the Costanera Sur in January (summer): 30°C with 70% humidity, draining but the river breeze helped. March-April is the outdoor sweet spot: 22°C, manageable UV, empty paths. October-November is similarly ideal — jacarandas blooming, 20°C, perfect cycling weather. July (winter) brings 12°C and dampness; running is fine but mornings feel raw. UV peaks dangerously in January (11+); sun protection is mandatory between 10am-4pm. The wind off the Río de la Plata is constant and can be bracing in winter.
January vs Adjacent Months
| Metric | December | January | February |
|---|---|---|---|
| Mean Temp | 22.8°C (73.0°F) | 24.7°C (76.5°F) | 23.5°C (74.3°F) |
| Rainfall | 67.1mm | 75.1mm | 79.2mm |
| Sunshine | 12.6 hrs | 12.1 hrs | 11.5 hrs |
| Humidity | 64.0% | 65.6% | 68.6% |
| Wind | 24.0 km/h | 25.9 km/h | 23.8 km/h |
| Rainy Days | 11.4 | 11.2 | 11.0 |
Seasonal Context
January falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Buenos Aires in January, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Buenos Aires in January?
The average temperature in Buenos Aires during January ranges from 21.0°C (69.8°F) to 28.6°C (83.5°F), with a mean of 24.7°C (76.5°F).
How much does it rain in Buenos Aires in January?
Buenos Aires receives an average of 75.1mm of precipitation in January, spread across approximately 11.2 rainy days.
What should I pack for Buenos Aires in January?
Based on January weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is January a good time to visit Buenos Aires?
January is a good time to visit Buenos Aires, with comfortable temperatures and manageable rainfall. However, it is the hottest month — consider early morning or evening activities.
Other Months for Buenos Aires
Cities with Similar January Climate (Humid Subtropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: -34.61°, -58.38°. Timezone: America/Argentina/Buenos_Aires. Last updated: 2026-07-30.