Climate averages 1991–2020
Dublin weather
in January.
A cold, moderately wet month: the coolest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Dublin: daytime highs average 7.8°C and nights cool to about 3.5°C. By daytime temperature it is the coolest month of the year.
Expect about 69 mm of rain on roughly 13 days, which makes January a moderately wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 07 min on an average January day.
The nearest other city in this atlas is Tallaght (10 km away). In January its highs average 7.3°C, about as warm as Dublin, with 69 mm of rain.
Among the 5 cities listed in Ireland, Dublin ranks 4th of 5 for the warmest January highs and joint 1st of 5 for the driest January (rainfall, lowest first). The mean January high of those 5 cities is 8.0°C; Dublin is 0.2°C cooler than that mean.
From January to February, average highs rise by 0.4°C to 8.2°C, and monthly rainfall falls from 69 mm to 57 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Dublin climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 7.8°C3.5°C | 3.5°C | 69 | 13.1 | 8.18 h |
| February | 8.2°C3.3°C | 3.3°C | 57 | 12.0 | 9.810 h |
| March | 9.8°C4.1°C | 4.1°C | 59 | 12.2 | 11.812 h |
| April | 11.9°C5.6°C | 5.6°C | 66 | 13.8 | 13.914 h |
| May | 14.7°C8.3°C | 8.3°C | 66 | 13.6 | 15.816 h |
| June | 17.3°C11.1°C | 11.1°C | 73 | 13.2 | 16.917 h |
| July | 18.9°C12.9°C | 12.9°C | 76 | 14.8 | 16.416 h |
| August | 18.6°C12.8°C | 12.8°C | 78 | 13.6 | 14.815 h |
| September | 16.5°C11.0°C | 11.0°C | 70 | 12.2 | 12.813 h |
| October | 13.3°C8.6°C | 8.6°C | 78 | 12.4 | 10.611 h |
| November | 10.0°C5.8°C | 5.8°C | 85 | 13.2 | 8.79 h |
| December | 8.1°C4.0°C | 4.0°C | 76 | 12.8 | 7.68 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Tallaght in JanuaryIreland · 10 kmHigh 7.3°C · Low 3.0°C · 69 mm rain
- Lisburn in JanuaryUnited Kingdom · 133 kmHigh 7.1°C · Low 3.2°C · 77 mm rain
- Belfast in JanuaryUnited Kingdom · 142 kmHigh 7.5°C · Low 3.9°C · 77 mm rain
- Douglas in JanuaryIsle of Man · 147 kmHigh 8.1°C · Low 5.8°C · 97 mm rain
- Limerick in JanuaryIreland · 175 kmHigh 8.1°C · Low 3.5°C · 94 mm rain
- Galway in JanuaryIreland · 186 kmHigh 8.0°C · Low 3.8°C · 99 mm rain
- Derry in JanuaryUnited Kingdom · 198 kmHigh 7.1°C · Low 3.0°C · 87 mm rain
- Southport in JanuaryUnited Kingdom · 217 kmHigh 7.1°C · Low 3.6°C · 108 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Dublin) is explained once on the Dublin year overview and on the Sources, method and limits page.
Tallaght lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.