Portmarnock Weather in January

With daytime temperatures of 10°C (50°F) and nighttime lows of 5°C (41°F), January in Portmarnock brings low temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 77 mm (3 in) falls on average.

Rainfall in Portmarnock in January

You can typically expect 18 days of rain this month, averaging around 77 mm (3 in). This is a month with many wet days but modest rainfall totals, so showers are generally light and easy to manage.

Temperature in Portmarnock in January

January in Portmarnock sees highs of 10°C (50°F) and lows of 5°C (41°F) overnight. January is in the winter season. Even at the warmest part of the day, temperatures stay low. Dressing warmly from the start is the sensible approach. Nights drop to 5°C (41°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet. The city often sees its mildest temperatures during January.

Sunshine in Portmarnock in January

The month is characterized by fewer sunny days, with roughly 56 hours hours of sunshine. Ideal for those who prefer a cooler, cloudier climate.

Wind Speed in Portmarnock in January

Wind speeds average 6 m/s (12 knots) during January. 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 January

The water sits at 10°C (50°F) this month, which is well below what most people consider swimmable. Wetsuits help, but expect it to still feel cold.

If you prefer dry days with pleasant temperatures, January may not be the ideal month to visit Portmarnock. Our weather planner can help you explore destinations with more pleasant weather conditions.

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• January
• February
• March
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• May
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• August

• September
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• December

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

Portmarnock Temperature in January

Min Temperature 5°C (41°F)  

Max Temperature 10°C (50°F)  

Water Temperature 10°C (50°F) *  

Chance of Rain 61%  

Precipitation 77 mm (3 in)  

Rainy days 18 days  

Humidity 81% *  

Windspeed 6 m/s (12 knots) *  

Sunshine 56 hours *  

Percentage Sunshine 25% *  

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

What to Wear in Portmarnock in January

We recommend to layer up for chilly conditions in Portmarnock in January. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. Rain is likely on several days, so bring a good rain jacket. With water temperatures around 10°C (50°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. With limited sunshine expected, sunglasses aren't a priority for packing.

What To Do in Portmarnock in January

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

Swimming

4/10

Cycling

4/10

Walking

4/10

Camping

4/10

Outdoor sports

4/10

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.