Portmarnock Weather in May

With daytime temperatures of 15°C (59°F) and nighttime lows of 9°C (48°F), May in Portmarnock brings moderate temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 66 mm (2.6 in) falls on average.

Rainfall in Portmarnock in May

Typically, about 16 days will experience rainfall, with an average of 66 mm (2.6 in) for the month. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.

Temperature in Portmarnock in May

Daytime highs in Portmarnock in May reach 15°C (59°F), with nights around 9°C (48°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights drop to 9°C (48°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.

Sunshine in Portmarnock in May

You can expect a moderate amount of sunlight, with approximately 188 hours. This means a pleasant mix of sun and overcast.

Wind Speed in Portmarnock in May

May sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

Average water temperature in May

At 10°C (50°F), the water is too cold for most people to swim comfortably. A wetsuit is pretty much essential if you plan to go in.

If you prefer dry days with pleasant temperatures, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit Ireland, check out our Portmarnock's climate page.

Portmarnock Temperature in May

Min Temperature 9°C (48°F)  

Max Temperature 15°C (59°F)  

Water Temperature 10°C (50°F) *  

Chance of Rain 53%  

Precipitation 66 mm (2.6 in)  

Rainy days 16 days  

Humidity 68% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 188 hours *  

Percentage Sunshine 42% *  

* Data from: Dublin, Ireland (7 KM, 4 Miles).

What to Wear in Portmarnock in May

The weather can swing between comfortable and chilly in May, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Wet weather is likely, so pack waterproof gear for multiple rainy days. The water temperature sits at about 10°C (50°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Portmarnock in May

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Ireland, check out our Portmarnock's climate page.

More climate data for Portmarnock

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Portmarnock climate overview or explore weather in Ireland.