May weather forecastPortmarnock, Ireland
May weather for Portmarnock, Ireland: The last month of the spring, May, is a moderate month in Portmarnock, Ireland, with an average temperature fluctuating between 13.2°C (55.8°F) and 7.8°C (46°F). April through June, with an average of 7.5h of sunshine, are months with the most sunshine in Portmarnock, Ireland.
May
Weather in May
The last month of the spring, May, is a moderate month in Portmarnock, Ireland, with an average temperature fluctuating between 13.2°C (55.8°F) and 7.8°C (46°F).Temperature
April's transformation into May witnesses an average high-temperature of a mild 13.2°C (55.8°F), noting a minor change from the preceding month. Throughout May nights, Portmarnock registers an average low-temperature of 7.8°C (46°F).Humidity
The months with the lowest humidity in Portmarnock are March through May, with an average relative humidity of 83%.Rainfall
May is the month with the least rainfall in Portmarnock. Rain falls for 13.3 days and accumulates 19mm (0.75") of precipitation.Snowfall
In Portmarnock, snow does not fall in April through October.Sea temperature
In Portmarnock, the average seawater temperature in May is 10.4°C (50.7°F).Note: Dipping into 10.4°C (50.7°F) below 10°C (50°F) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 13°C (55.4°F) can be jarring.
Daylight
In Portmarnock, Ireland, the average length of the day in May is 15h and 55min.On the first day of the month, sunrise is at 5:48 am and sunset at 8:54 pm. On the last day of May, sunrise is at 5:02 am and sunset at 9:41 pm IST.
Sunshine
The months with the most sunshine are April through June, with an average of 7.5h of sunshine.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index of 4 in May converts into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Portmarnock, Ireland
- Average high temperature in May: 13.2°C
The warmest month (with the highest average high temperature) is July (17.4°C).
The month with the lowest average high temperature is January (7.6°C).
- Average low temperature in May: 7.8°C
The months with the highest average low temperature are July and August (12.1°C).
The coldest months (with the lowest average low temperature) are February and March (3.9°C).
Average pressure in May
Portmarnock, Ireland
- Average pressure in May: 1016mbar
The month with the highest atmospheric pressure is May (1016mbar).
The month with the lowest atmospheric pressure is November (1008.2mbar).
Average wind speed in May
Portmarnock, Ireland
- Average wind speed in May: 17.4km/h
The windiest month (with the highest average wind speed) is January (24.2km/h).
The calmest month (with the lowest average wind speed) is June (15.2km/h).
Average humidity in May
Portmarnock, Ireland
- Average humidity in May: 83%
The months with the highest relative humidity are July and December (86%).
The months with the lowest relative humidity are March, April and May (83%).
Average rainfall in May
Portmarnock, Ireland
- Average rainfall in May: 19mm
The wettest month (with the highest rainfall) is November (51mm).
The driest month (with the least rainfall) is May (19mm).
Average rainfall days in May
Portmarnock, Ireland
- Average rainfall days in May: 13.3 days
The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is February (10.7 days).
Average snowfall in May
Portmarnock, Ireland
- Average snowfall in May: 0mm
The month with the highest snowfall is December (12mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in May
Portmarnock, Ireland
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in May
Portmarnock, Ireland
- Average sea temperature in May: 10.4°C
The best month for swimming (with the highest average sea temperature) is August (14.9°C).
The coldest month (with the lowest average sea temperature) is March (8.4°C).
Average daylight in May /
Average sunshine in May
Portmarnock, Ireland
- Average daylight in May: 15h and 54min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in May: 7h and 30min
The months with the most sunshine are April, May and June (Average sunshine: 7h and 30min).
The months with the least sunshine are January, February and November (Average sunshine: 4h and 18min).
Average sunshine days in May
Portmarnock, Ireland
- Average sunshine days in May: 14.9 days
The months with the most sunshine days are January and December (16.8 days).
The month with the least sunshine days is July (11 days).
Average UV index in May
Portmarnock, Ireland
- Average UV index in May: 4
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Portmarnock, Ireland
- Average cloud cover in May: 51
The months with the most cloud cover are January and February (Cloud cover 57).
The months with the least cloud cover are April and September (Cloud cover 50).
Average visibility in May
Portmarnock, Ireland
- Average visibility in May: 9km
The months with the highest visibility are January, February, March, October, November and December (10km).
The months with the lowest visibility are April, May, June, July, August and September (9km).
