Climate almanac
Castleknock
Leinster, Ireland · 53.37°, -6.36°
What is the weather like in Castleknock in September?
In September, Castleknock is typically 61°F (16°C) during the day and 51°F (11°C) at night. The month brings about 3.8 in (96 mm) of precipitation in total.
- Average high61°F (16°C)
- Average low51°F (11°C)
- Precipitation3.8 in (96 mm)
- Clear or mostly clear days2
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)