Saint Helens Weather in September

During September, Saint Helens experiences pleasant daytime temperatures of 19°C (66°F) and cooler nights around 11°C (52°F). Expect quite a bit of rainfall. Around 85 mm (3.3 in) is typical.

Rainfall in Saint Helens in September

Rain is expected on roughly 16 days, totalling around 85 mm (3.3 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Saint Helens in September

In September, expect pleasant temperatures in Saint Helens, with highs of 19°C (66°F) and lows of 11°C (52°F) at night. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights cool down to 11°C (52°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Saint Helens in September

The month experiences a moderate amount of sunlight, with 134 hours of sunshine. This provides a nice balance between sunshine and clouds.

If you prefer enjoying temperate temperatures and rain-free days, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.