Click on a day for an hourly weather forecast
The temperatures in Buenos Aires in September are usually low and can range between 11°C and 17°C.
You can expect about 3 to 8 days of rain in Buenos Aires during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Buenos Aires in September 2025.
If you’re planning to visit Buenos Aires in the near future, we highly recommend that you review the 14 day weather forecast for Buenos Aires before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 30° / 21° | 4 | 27 | 0 | 92 mm | Good | Buenos Aires in January |
| February | 28° / 21° | 5 | 23 | 0 | 153 mm | Perfect | Buenos Aires in February |
| March | 25° / 19° | 4 | 27 | 0 | 121 mm | Perfect | Buenos Aires in March |
| April | 22° / 16° | 4 | 26 | 0 | 103 mm | Good | Buenos Aires in April |
| May | 18° / 13° | 4 | 27 | 0 | 106 mm | Good | Buenos Aires in May |
| June | 15° / 10° | 4 | 26 | 0 | 81 mm | Good | Buenos Aires in June |
| July | 14° / 9° | 5 | 26 | 0 | 113 mm | Good | Buenos Aires in July |
| August | 16° / 10° | 3 | 28 | 0 | 105 mm | Good | Buenos Aires in August |
| September | 17° / 11° | 5 | 25 | 0 | 108 mm | Good | Buenos Aires in September |
| October | 20° / 13° | 5 | 26 | 0 | 128 mm | Good | Buenos Aires in October |
| November | 24° / 16° | 5 | 25 | 0 | 132 mm | Perfect | Buenos Aires in November |
| December | 28° / 19° | 4 | 27 | 0 | 119 mm | Perfect | Buenos Aires in December |