Portmarnock Weather in December

With daytime temperatures of 10°C (50°F) and nighttime lows of 5°C (41°F), December in Portmarnock brings low temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 85 mm (3.3 in) falls on average.

Rainfall in Portmarnock in December

Typically, you can expect about 17 days of rain this month, with 85 mm (3.3 in) on average. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.

Temperature in Portmarnock in December

December in Portmarnock brings typical temperatures with highs around 10°C (50°F) and lows of 5°C (41°F). December is a notable month of the winter season. Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. With overnight lows of 5°C (41°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in Portmarnock in December

This month is characterized by fewer sunny days, with about 51 hours of sunshine. It's great for those who appreciate cooler, less sunny days.

Wind Speed in Portmarnock in December

Wind speeds average 6 m/s (12 knots) during December. At this speed, expect strong winds that make large branches move and create some resistance when walking. Since this is an average, some days have fresh winds while others have strong breezes that can make umbrellas tricky to control.

Average water temperature in December

The water temperature is only 11°C (52°F) this month — cold enough that most people will want to stay out. Hardy swimmers may manage a quick dip, but it won't be comfortable.

December in Portmarnock has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.

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• January
• February
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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 December

Min Temperature 5°C (41°F)  

Max Temperature 10°C (50°F)  

Water Temperature 11°C (52°F) *  

Chance of Rain 57%  

Precipitation 85 mm (3.3 in)  

Rainy days 17 days  

Humidity 83% *  

Windspeed 6 m/s (12 knots) *  

Sunshine 51 hours *  

Percentage Sunshine 23% *  

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

What to Wear in Portmarnock in December

Dress warmly and in layers for your trip to Portmarnock in December. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Expect heavy rainfall, so bring good rain protection and waterproof bags. With water temperatures around 11°C (52°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Sunglasses aren't essential this month, though you might want them for the occasional bright moment.

What To Do in Portmarnock in December

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

Swimming

4/10

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

6/10

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.