Dundalk weather in January
Temperature, sea and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Poor
Best time to visit: April – June, August – September
What is the weather like in Dundalk in January?
In January, Dundalk is cold: daytime highs average 7 °C, and nights cool down to about 3 °C. The sea averages 8.8 °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 63 mm in total. All in all, January is not an ideal month for a holiday in Dundalk.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 8 | 8 | 9 |
| Day | 8° | 7° | 8° |
| Night | 4° | 3° | 3° |
| Sea | 10° | 9° | 8° |
| Sun | 2 h | 2 h | 3 h |
| Rain days | 12 | 12 | 11 |
More details for January
- Daylight
- 7 h 55 min08:37 – 16:32
- 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 %41 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in January
- Warm jacket
- Rain jacket or umbrella
Dundalk in January: quick answers
Is Dundalk hot in January?
No. In January, Dundalk is cold: daytime highs average 7 °C and nights drop to about 3 °C.
Can you swim in Dundalk in January?
Only if you don't mind cold water: in January the sea averages just 8.8 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Dundalk in January?
Rain is frequent, with about 12 rainy days and 63 mm in total.
Dundalk month by month
The whole year in DundalkAll destinations: IrelandWhere to go in JanuarySea temperature in January
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