Buenos Aires Weather in September
In September, Buenos Aires averages a high of 19°C (67°F) and a low of 11°C (52°F), from 50 years of daily records (1971–2025).
19°C
Average high
67°F
11°C
Average low
52°F
33°C
Record high
91°F · September 6, 1995
0°C
Record low
33°F · September 1, 1990
What September Is Like in Buenos Aires
- September 2024 was the 2nd warmest September in 50 years of records, 1.8°C (3.2°F) above the long-run average.
- 6 of the 10 warmest Septembers on record in Buenos Aires have come since 2010.
- The September heat record, 33°C (91°F) on September 6, 1995, has stood for 30 years.
- The coldest September reading, 0°C (33°F) on September 1, 1990, has not been matched in 35 years.
At least 1 mm of rain falls on 29% of September days.
Warmest: 2011 (21.4°C)Latest: 2024 (21.2°C)10-year averageLong-run average (19.5°C)
Look Up a Day in September
See the weather in Buenos Aires on any September date, year by year.
Source: NOAA GHCN-Daily, Buenos Aires Observ (1971–2025); Aeroparque Jorge Newbery (1973–2025). Averages cover 1971–2025. How we compute this