Click on a day for an hourly weather forecast
The weather in Roseau in September is very hot. The average temperatures are between 25°C and 31°C, drinking water regularly is advisable.
You can expect about 3 to 8 days of rain in Roseau 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 Roseau in September 2025.
If you’re planning to visit Roseau in the near future, we highly recommend that you review the 14 day weather forecast for Roseau before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 28° / 23° | 1 | 30 | 0 | 58 mm | Perfect | Roseau in January |
| February | 28° / 22° | 2 | 27 | 0 | 49 mm | Perfect | Roseau in February |
| March | 28° / 23° | 1 | 30 | 0 | 49 mm | Perfect | Roseau in March |
| April | 27° / 23° | 4 | 26 | 0 | 94 mm | Perfect | Roseau in April |
| May | 28° / 24° | 4 | 27 | 0 | 113 mm | Perfect | Roseau in May |
| June | 29° / 24° | 3 | 27 | 0 | 84 mm | Good | Roseau in June |
| July | 29° / 25° | 5 | 26 | 0 | 121 mm | Good | Roseau in July |
| August | 30° / 25° | 6 | 25 | 0 | 180 mm | Good | Roseau in August |
| September | 31° / 25° | 7 | 23 | 0 | 183 mm | Ok | Roseau in September |
| October | 31° / 25° | 7 | 24 | 0 | 170 mm | Ok | Roseau in October |
| November | 30° / 25° | 4 | 26 | 0 | 140 mm | Good | Roseau in November |
| December | 29° / 24° | 2 | 29 | 0 | 77 mm | Good | Roseau in December |