Buenos Aires Weather in September
What's the weather like in Buenos Aires (Cauca) in September 2025?
The climate in Buenos Aires during September can be summarized as hot, humid and wet.
September is in the fall / autumn in Buenos Aires and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a muggy 29°C (85°F), whilst at night 17°C (63°F) is normal.
| Daytime temperature | 29.4°C 84.9°F |
|---|---|
| Nightly temperature | 17.4°C 63.3°F |
| Average temperature | 23.4°C 74.1°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 178 mm 7 ins |
| Rainy days | 12 days |
| Sea temperature | 27.1°C 80.8°F |
| Humidity | 75% |
| Windspeed | 9.7kph 6 mph |
On average September is the 6th driest month of the year in Buenos Aires with around 178mm 7 inches of rain making it a wet time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
September temperatures in Buenos Aires
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Buenos Aires in September 2025.
Other monthly averages
Best places to visit in September
Buenos Aires weather stats
| Hottest month: | March | 29.2°C 84.6°F |
|---|---|---|
| Driest month: | July | 98mm 3.9ins |
| Sunniest month: | September | 6hrs |
| Coldest month: | October | 28.1°C 82.6°F |
| Wettest month: | October | 308mm 12.1ins |
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