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.
Temperatures
14° / 8°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
65
mm
Sun Hours
6.7
Hrs
