Climate averages 1991–2020
Tallaght 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 Tallaght: daytime highs average 7.3°C and nights cool to about 3.0°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 08 min on an average January day.
The nearest other city in this atlas is Dublin (10 km away). In January its highs average 7.8°C, about as warm as Tallaght, with 69 mm of rain.
Among the 5 cities listed in Ireland, Tallaght ranks 5th 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; Tallaght is 0.7°C cooler than that mean.
From January to February, average highs rise by 0.5°C to 7.8°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
Tallaght climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 7.3°C3.0°C | 3.0°C | 69 | 13.1 | 8.18 h |
| February | 7.8°C2.8°C | 2.8°C | 57 | 12.0 | 9.810 h |
| March | 9.4°C3.6°C | 3.6°C | 59 | 12.2 | 11.812 h |
| April | 11.6°C5.2°C | 5.2°C | 66 | 13.8 | 13.914 h |
| May | 14.4°C7.8°C | 7.8°C | 66 | 13.6 | 15.816 h |
| June | 17.0°C10.6°C | 10.6°C | 73 | 13.2 | 16.917 h |
| July | 18.5°C12.4°C | 12.4°C | 76 | 14.8 | 16.416 h |
| August | 18.2°C12.3°C | 12.3°C | 78 | 13.6 | 14.815 h |
| September | 16.1°C10.5°C | 10.5°C | 70 | 12.2 | 12.713 h |
| October | 12.8°C8.0°C | 8.0°C | 78 | 12.4 | 10.611 h |
| November | 9.6°C5.2°C | 5.2°C | 85 | 13.2 | 8.79 h |
| December | 7.6°C3.4°C | 3.4°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
- Dublin in JanuaryIreland · 10 kmHigh 7.8°C · Low 3.5°C · 69 mm rain
- Lisburn in JanuaryUnited Kingdom · 139 kmHigh 7.1°C · Low 3.2°C · 77 mm rain
- Belfast in JanuaryUnited Kingdom · 149 kmHigh 7.5°C · Low 3.9°C · 77 mm rain
- Douglas in JanuaryIsle of Man · 157 kmHigh 8.1°C · Low 5.8°C · 97 mm rain
- Limerick in JanuaryIreland · 166 kmHigh 8.1°C · Low 3.5°C · 94 mm rain
- Galway in JanuaryIreland · 178 kmHigh 8.0°C · Low 3.8°C · 99 mm rain
- Derry in JanuaryUnited Kingdom · 200 kmHigh 7.1°C · Low 3.0°C · 87 mm rain
- Cork in JanuaryIreland · 209 kmHigh 8.7°C · Low 4.7°C · 79 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 Tallaght) is explained once on the Tallaght year overview and on the Sources, method and limits page.
Dublin lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.