Click on a day for an hourly weather forecast
The temperatures in Rosario in September are comfortable with low of 10°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Rosario 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 Rosario in September 2025.
If you’re planning to visit Rosario in the near future, we highly recommend that you review the 14 day weather forecast for Rosario before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 34° / 20° | 5 | 26 | 0 | 116 mm | Ok | Rosario in January |
| February | 32° / 19° | 5 | 23 | 0 | 139 mm | Good | Rosario in February |
| March | 29° / 16° | 4 | 27 | 0 | 103 mm | Good | Rosario in March |
| April | 25° / 14° | 4 | 26 | 0 | 99 mm | Perfect | Rosario in April |
| May | 20° / 11° | 3 | 28 | 0 | 80 mm | Good | Rosario in May |
| June | 17° / 9° | 2 | 28 | 0 | 41 mm | Good | Rosario in June |
| July | 16° / 8° | 3 | 28 | 0 | 55 mm | Good | Rosario in July |
| August | 19° / 9° | 3 | 28 | 0 | 73 mm | Good | Rosario in August |
| September | 21° / 10° | 4 | 26 | 0 | 93 mm | Good | Rosario in September |
| October | 24° / 12° | 5 | 26 | 0 | 123 mm | Perfect | Rosario in October |
| November | 29° / 16° | 5 | 25 | 0 | 120 mm | Good | Rosario in November |
| December | 33° / 18° | 4 | 27 | 0 | 113 mm | Good | Rosario in December |