Climate almanac
Letterkenny
Ulster, Ireland · 54.95°, -7.73°
What is the weather like in Letterkenny in September?
In September, Letterkenny is typically 60°F (16°C) during the day and 50°F (10°C) at night. The month brings about 4.2 in (106 mm) of precipitation in total.
- Average high60°F (16°C)
- Average low50°F (10°C)
- Precipitation4.2 in (106 mm)
- Clear or mostly clear days2
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)