Weather in St Helens in September
How warm is it in St Helens in September?
In September the typical daytime high in St Helens is 17.7 °C on average, from 19.1 °C at the start to 16.2 °C at the end of the month.
That is 2.1 °C cooler than in August and 3.2 °C warmer than in October.
The last 10 years were 1.0 °C warmer than more than 40 years ago.
Click a day for more: afternoon and night, the usual range, records and how fast it is warming.
The average of the weather stations Valley (122 km), Oxford (212 km) and Dublin Phoenix Park (238 km); nearer ones count more.