Click on a day for an hourly weather forecast
The temperatures in Newport in September are usually low and can range between 11°C and 18°C.
You can expect about 3 to 8 days of rain in Newport 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 Newport in September 2025.
If you’re planning to visit Newport in the near future, we highly recommend that you review the 14 day weather forecast for Newport before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / 2° | 8 | 19 | 4 | 46 mm | Awful | Newport in January |
| February | 7° / 2° | 7 | 17 | 5 | 45 mm | Bad | Newport in February |
| March | 10° / 3° | 4 | 25 | 2 | 40 mm | Bad | Newport in March |
| April | 12° / 5° | 4 | 25 | 1 | 32 mm | Ok | Newport in April |
| May | 14° / 7° | 5 | 26 | 0 | 59 mm | Good | Newport in May |
| June | 17° / 10° | 5 | 25 | 0 | 70 mm | Good | Newport in June |
| July | 20° / 12° | 6 | 25 | 0 | 68 mm | Good | Newport in July |
| August | 20° / 13° | 4 | 27 | 0 | 73 mm | Good | Newport in August |
| September | 18° / 11° | 4 | 26 | 0 | 45 mm | Good | Newport in September |
| October | 14° / 9° | 6 | 25 | 0 | 58 mm | Good | Newport in October |
| November | 10° / 6° | 7 | 23 | 1 | 57 mm | Bad | Newport in November |
| December | 7° / 3° | 6 | 23 | 2 | 49 mm | Bad | Newport in December |