Click on a day for an hourly weather forecast
The temperatures in Westport in September are comfortable with low of 17°C and and high up to 24°C.
You can expect about 3 to 8 days of rain in Westport 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 Westport in September 2025.
If you’re planning to visit Westport in the near future, we highly recommend that you review the 14 day weather forecast for Westport before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -3° | 6 | 17 | 8 | 118 mm | Awful | Westport in January |
| February | 3° / -3° | 7 | 12 | 10 | 135 mm | Awful | Westport in February |
| March | 7° / 1° | 8 | 17 | 6 | 145 mm | Awful | Westport in March |
| April | 13° / 6° | 8 | 21 | 1 | 145 mm | Bad | Westport in April |
| May | 19° / 12° | 8 | 23 | 0 | 153 mm | Ok | Westport in May |
| June | 24° / 17° | 8 | 22 | 0 | 166 mm | Good | Westport in June |
| July | 28° / 20° | 9 | 22 | 0 | 208 mm | Good | Westport in July |
| August | 28° / 20° | 7 | 24 | 0 | 190 mm | Good | Westport in August |
| September | 24° / 17° | 6 | 24 | 0 | 140 mm | Perfect | Westport in September |
| October | 18° / 11° | 6 | 25 | 0 | 162 mm | Good | Westport in October |
| November | 11° / 5° | 6 | 23 | 1 | 105 mm | Ok | Westport in November |
| December | 6° / 1° | 7 | 18 | 5 | 164 mm | Awful | Westport in December |