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Portmarnock Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Portmarnock.
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Climate overview of Portmarnock
Portmarnock, Dublin County, Ireland, has a moderate seasonal temperature range, with July reaching 19°C (66°F) and January cooling to 10°C (50°F).
The city receives around 934 mm (37 in) of rainfall per year. November is the wettest month and March the driest. Sunshine peaks in May, when the city sees around 6.3 hours of sunshine per day.
Portmarnock Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Portmarnock - and find the best time to visit.
Monthly Temperature in Portmarnock
The weather in Portmarnock changes moderately throughout the year, offering enough variation to appreciate each season. On average, daytime temperatures range from a pleasant 19°C (66°F) in July to a chilly 10°C (50°F) in January.
Nighttime temperatures range from 13°C (55°F) in July to 4°C (39°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Portmarnock
Generally, Portmarnock experiences moderate precipitation patterns, averaging 934 mm (37 in) yearly. The wettest period in Portmarnock occurs in November, which receives around 98 mm (3.9 in) of precipitation. During the driest month, March, Portmarnock experiences moderate rainfall, totaling 64 mm (2.5 in). The consistent precipitation levels throughout the year contribute to a relatively stable climate. For more details, please visit our Portmarnock Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Portmarnock
In Portmarnock, summer days are longer and more sunny, with daily sunshine hours peaking at 6.3 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 1.7 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Dublin, Ireland (7 KM, 4 Miles).
Daily hours of sunshine
Data from: Dublin, Ireland (7 KM, 4 Miles).
Daily percentage of sunshine
Data from: Dublin, Ireland (7 KM, 4 Miles).
Water Temperature in Portmarnock
The mean water temperature over the year ranges from 8°C (46°F) in March to 15°C (59°F) in August.
Water temperature over the year
Data from: Dublin, Ireland (7 KM, 4 Miles).
Humidity in Portmarnock by Month
The relative humidity is high throughout the year in Portmarnock.
The city experiences its highest humidity in December, reaching 83%. In April, the humidity drops to its lowest level at 68%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Data from: Dublin, Ireland (7 KM, 4 Miles).
Wind Speed in Portmarnock
The mean wind speed varies between 4 m/s (8 knots) and 6 m/s (12 knots) throughout the year. It is lowest in May, June, July, August and September and highest during January, February, March and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Data from: Dublin, Ireland (7 KM, 4 Miles).
Best Time to Visit Portmarnock
Conditions in Portmarnock are generally most comfortable in July and August. They are typically least comfortable in January, February and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
cold
Feb
cold
Mar
mixed
Apr
mixed
May
good
Jun
good
Jul
very good
Aug
very good
Sep
good
Oct
good
Nov
mixed
Dec
cold
- Best overall: July and August
- Warmest weather: July and August
- Most sunshine: May and June
Frequently asked questions about the climate in Portmarnock
What is the best time to visit Portmarnock?
July and August typically offer the most optimal weather in Portmarnock. In contrast, January, February and December tend to have less optimal conditions.
What temperatures can I expect in Portmarnock?
Daytime highs range from 10°C (50°F) in January to 19°C (66°F) in July. Nighttime lows range from 4°C (39°F) to 13°C (55°F).
How much rain does Portmarnock get?
Annual rainfall is around 934 mm (37 in). November is the wettest month with 98 mm (3.9 in), while March is the driest with 64 mm (2.5 in).
How sunny is Portmarnock?
Portmarnock receives around 1,432 hours of sunshine per year. May is the sunniest month with 188 hours, while December is the cloudiest with just 51 hours.
Portmarnock 3-Day Forecast
Portmarnock on the map
Portmarnock is highlighted - select any city to see its climate.
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