Portstewart Weather in September

September in Portstewart sees daytime temperatures around 16°C (61°F) and lows of 12°C (54°F) at night. With around 107 mm (4.2 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Portstewart in September

Records from the past 30 years suggest around 21 days of rain, with 107 mm (4.2 in) average for the month. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.

Temperature in Portstewart in September

Daytime highs in Portstewart in September reach 16°C (61°F), with nights around 12°C (54°F). The difference between afternoon and evening temperatures is usually noticeable. With lows of 12°C (54°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Portstewart in September

The area enjoys a balanced 118 hours of sunlight, ensuring it's neither too overcast nor too sunny.

For Portstewart itself, June generally stands out with 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.