Portmarnock is a city of approximately 9,300 people in Leinster, Ireland. Located in the GMT/IST time zone at 53.4°N latitude.
Recent weather here gives a sense of typical conditions: in 2025, Portmarnock recorded a mean annual temperature of 53°F, ranging from 27°F lows in January to 80°F highs in July, with about 46 inches of precipitation across the year.
View historical weather for Portmarnock · More cities in Leinster