Buenos Aires weather in September
September in Buenos Aires: nice, a little rain, with clean air — an excellent time to visit.
#6 of 12 months in Buenos Aires · #191 of 604 destinations to visit in September · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Buenos Aires climate normals — September
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 51°F | |
| Feels like (high) | 16°C / 61°F | |
| Rainfall | 52 mm / 2 in | 🌦 some rain |
| Rainy days | 6 days | |
| Humidity | 71% | 💧 humid |
| Dew point | 9°C / 48°F | |
| Sunshine | 8.9 h/day | |
| Daylight | 11.9 h | |
| Wind | 25 km/h / 15 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Buenos Aires in September — FAQ
- Is September a good time to visit Buenos Aires?
- September in Buenos Aires: nice, a little rain, with clean air — an excellent time to visit. It ranks #6 of 12 months for Buenos Aires on SeasonMap's comfort score (85/100).
- What is the weather like in Buenos Aires in September?
- In September, Buenos Aires averages a daily high of 17.6°C and a low of 10.8°C, with about 51.9 mm of rain over roughly 5.6 rainy days.
- What is the air quality in Buenos Aires in September?
- Buenos Aires has a mean US Air Quality Index of about 34 in September.