Buenos Aires weather by month
Buenos Aires runs from about 9°C in July to 25°C in February, with March the wettest month at 277 mm.
warmest month
February
25°C
coolest month
July
9°C
wettest month
March
277 mm
worst air month
July
13 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 25°C | 45 mm | 405 h | 7 |
| February | 25°C | 101 mm | 317 h | 7 |
| March | 22°C | 277 mm | 303 h | 8 |
| April | 18°C | 144 mm | 206 h | 8 |
| May | 12°C | 21 mm | 203 h | 12 |
| June | 13°C | 57 mm | 218 h | 13 |
| July | 9°C | 15 mm | 268 h | 13 |
| August | 11°C | 160 mm | 194 h | 8 |
| September | 16°C | 20 mm | 304 h | 9 |
| October | 19°C | 74 mm | 315 h | 6 |
| November | 21°C | 140 mm | 349 h | 9 |
| December | 22°C | 43 mm | 393 h | 8 |
About 3,475 hours of sun a year. Roughly 110 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-22. Full method, licences and the list of sources we rejected are on the methodology page.