The temperatures in St Helens in September are usually low and can range between 11°C and 19°C.
You can expect about 3 to 8 days of rain in St 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 St Helens in September 2025.
If you’re planning to visit St Helens in the near future, we highly recommend that you review the 14 day weather forecast for St Helens before you arrive.
Temperatures
19° / 11°
Rainy Days
3
Snowy Days
0
Dry Days
27
Rainfall
48
mm
Sun Hours
8.7
Hrs
