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Dundalk Weather in December
December in Dundalk averages 9°C (48°F) during the day and 4°C (39°F) at night. Quite a bit of rainfall is typical this month, with around 81 mm (3.2 in) on average. An umbrella is a good idea.
Rainfall in Dundalk in December
On average, there are about 19 days with rain during this month, averaging 81 mm (3.2 in). Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Dundalk in December
Daytime highs in Dundalk in December reach 9°C (48°F), with nights around 4°C (39°F). The winter season takes place during December. The days stay cool from start to finish. Layering up well will make outdoor time much more comfortable. With lows around 4°C (39°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Dundalk in December
The month is characterized by fewer sunny days, with roughly 51 hours hours of sunshine. Ideal for those who prefer a cooler, cloudier climate.Our weather planner can help you find worldwide destinations with pleasant weather during this period. July typically offers the best weather for Dundalk.
Dundalk Temperature in December
Min Temperature
4°C (39°F)
Max Temperature
9°C (48°F)
Chance of Rain
62%
Precipitation
81 mm (3.2 in)
Rainy days
19 days
Humidity
83% *
Sunshine
51 hours *
Percentage Sunshine
23% *
* Data from: Dublin, Ireland (64 KM, 39 Miles).
Dundalk Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Dundalk - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Dundalk typically stay consistent throughout December, with daily highs averaging around 9°C (48°F). Nights are cold, with lows around 3°C (37°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather records for Dundalk in December
Browse day-by-day weather records for Dundalk spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Dundalk historical weather extremes in December
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Dundalk.
- Dundalk recorded its highest December temperature of 14°C (57°F) on December 9, 2025.
- Dundalk experienced its chilliest December day on December 21, 2010, reaching only -4°C (25°F).
- Nighttime temperatures dropped to -10°C (14°F) on December 21, 2010, marking the coldest December night on record.
Best Places in Ireland in December
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in December →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Dundalk in December
Dress warmly and in layers for your trip to Dundalk 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 limited sunshine expected, sunglasses aren't a priority for packing.
What To Do in Dundalk in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming4/10 -
Cycling4/10 -
Walking4/10 -
Camping4/10 -
Outdoor sports4/10
Dundalk 3-Day Forecast
More climate data for Dundalk
Temperature Rainfall Sunshine Humidity
See the full Dundalk climate overview or explore weather in Ireland.
Popular in December
Where to go in December - average daytime high across popular destinations.
Doolin
11°C (52°F) Cork11°C (52°F) Westport9°C (48°F) Kilkenny
9°C (48°F) Kenmare10°C (50°F) Killarney10°C (50°F) Galway10°C (50°F) Dublin10°C (50°F) Bucket list
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