Climate almanac
Portstewart
Northern Ireland, United Kingdom · 55.18°, -6.71°
What is the weather like in Portstewart in September?
In September, Portstewart is typically 59°F (15°C) during the day and 55°F (13°C) at night. The month brings about 4.7 in (120 mm) of precipitation in total.
- Average high59°F (15°C)
- Average low55°F (13°C)
- Precipitation4.7 in (120 mm)
- Clear or mostly clear days2
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)