Click on a day for an hourly weather forecast
The temperatures in Saint Helens in September are quite cold with temperatures between 8°C and 14°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Saint Helens 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 Saint Helens in September 2025.
If you’re planning to visit Saint Helens in the near future, we highly recommend that you review the 14 day weather forecast for Saint Helens before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 20° / 14° | 4 | 27 | 0 | 81 mm | Good | Saint Helens in January |
| February | 20° / 14° | 5 | 23 | 0 | 64 mm | Good | Saint Helens in February |
| March | 19° / 13° | 5 | 26 | 0 | 98 mm | Good | Saint Helens in March |
| April | 17° / 12° | 4 | 26 | 0 | 50 mm | Good | Saint Helens in April |
| May | 14° / 10° | 4 | 27 | 0 | 49 mm | Good | Saint Helens in May |
| June | 13° / 8° | 5 | 25 | 0 | 77 mm | Ok | Saint Helens in June |
| July | 12° / 8° | 4 | 27 | 0 | 45 mm | Ok | Saint Helens in July |
| August | 12° / 7° | 6 | 25 | 0 | 74 mm | Ok | Saint Helens in August |
| September | 14° / 8° | 5 | 25 | 0 | 65 mm | Good | Saint Helens in September |
| October | 15° / 9° | 6 | 25 | 0 | 73 mm | Good | Saint Helens in October |
| November | 17° / 11° | 6 | 24 | 0 | 89 mm | Good | Saint Helens in November |
| December | 18° / 12° | 5 | 26 | 0 | 74 mm | Good | Saint Helens in December |