Click on a day for an hourly weather forecast
The temperatures in Port Arthur in September are quite cold with temperatures between 7°C and 11°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Port Arthur 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 Port Arthur in September 2025.
If you’re planning to visit Port Arthur in the near future, we highly recommend that you review the 14 day weather forecast for Port Arthur before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 18° / 12° | 3 | 28 | 0 | 49 mm | Good | Port Arthur in January |
| February | 17° / 12° | 3 | 26 | 0 | 43 mm | Good | Port Arthur in February |
| March | 16° / 11° | 3 | 28 | 0 | 48 mm | Good | Port Arthur in March |
| April | 14° / 10° | 3 | 27 | 0 | 44 mm | Good | Port Arthur in April |
| May | 12° / 8° | 3 | 28 | 0 | 58 mm | Ok | Port Arthur in May |
| June | 10° / 7° | 4 | 26 | 0 | 62 mm | Ok | Port Arthur in June |
| July | 9° / 6° | 4 | 27 | 0 | 49 mm | Ok | Port Arthur in July |
| August | 10° / 6° | 4 | 27 | 0 | 71 mm | Ok | Port Arthur in August |
| September | 11° / 7° | 3 | 27 | 0 | 57 mm | Ok | Port Arthur in September |
| October | 13° / 8° | 3 | 28 | 0 | 51 mm | Ok | Port Arthur in October |
| November | 15° / 9° | 4 | 26 | 0 | 61 mm | Good | Port Arthur in November |
| December | 16° / 11° | 3 | 28 | 0 | 58 mm | Good | Port Arthur in December |