Dundalk weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: April – June, August – September
What is the weather like in Dundalk in December?
In December, Dundalk is cold: daytime highs average 8 °C, and nights cool down to about 4 °C. The sea averages 10.1 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Rain is frequent, with about 12 rainy days and 73 mm in total. All in all, December is not an ideal month for a holiday in Dundalk.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 7 | 8 | 8 |
| Day | 10° | 8° | 7° |
| Night | 6° | 4° | 3° |
| Sea | 12° | 10° | 9° |
| Sun | 2 h | 2 h | 2 h |
| Rain days | 13 | 12 | 12 |
More details for December
- Daylight
- 7 h 26 min08:38 – 16:04
- UV index
- 0 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 26 km/haverage daily peakAll months
- Cloud cover
- 73 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+0Europe/Dublin
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 20 %40 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in December
- Warm jacket
- Rain jacket or umbrella
Dundalk in December: quick answers
Is Dundalk hot in December?
No. In December, Dundalk is cold: daytime highs average 8 °C and nights drop to about 4 °C.
Can you swim in Dundalk in December?
Only if you don't mind cold water: in December the sea averages just 10.1 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Dundalk in December?
Rain is frequent, with about 12 rainy days and 73 mm in total.
Dundalk month by month
The whole year in DundalkAll destinations: IrelandWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences