With a population of around 8,300, Castleknock sits in Leinster, Ireland. The city operates in the GMT/IST time zone.
In 2025, Castleknock recorded an average annual temperature of 52°F. The hottest temperatures reached 85°F in July; the coolest were 24°F in January. Total precipitation for the year was 41 inches, with the wettest month being July. Snowfall for the year totaled approximately 1 inches.
View current conditions and forecast for Castleknock · More cities in Leinster