Saint Helens Weather in May

The climate in Saint Helens during May can be summarized as mild and reasonably dry.

May is in the spring in Saint Helens and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 18°C (65°F), whilst at night 6°C (43°F) is normal.

On average May is the 5th driest month of the year in Saint Helens with around 64mm 2.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.2 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Saint Helens in May 2025.