Climate averages 1991–2020
Dublin weather
in August.
A mild, moderately wet month: the 2nd warmest and the joint 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Dublin: daytime highs average 18.6°C and nights cool to about 12.8°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 78 mm of rain on roughly 14 days, which makes August a moderately wet month (the joint 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 48 min on an average August day.
The nearest other city in this atlas is Tallaght (10 km away). In August its highs average 18.2°C, about as warm as Dublin, with 78 mm of rain.
Among the 5 cities listed in Ireland, Dublin ranks 1st of 5 for the warmest August highs and joint 2nd of 5 for the driest August (rainfall, lowest first). The mean August high of those 5 cities is 18.3°C; Dublin is 0.3°C warmer than that mean.
From August to September, average highs fall by 2.1°C to 16.5°C, and monthly rainfall falls from 78 mm to 70 mm.
The annual picture
August 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 | 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, selected | 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
August in nearby cities
- Tallaght in AugustIreland · 10 kmHigh 18.2°C · Low 12.3°C · 78 mm rain
- Lisburn in AugustUnited Kingdom · 133 kmHigh 17.4°C · Low 12.1°C · 81 mm rain
- Belfast in AugustUnited Kingdom · 142 kmHigh 17.3°C · Low 12.6°C · 81 mm rain
- Douglas in AugustIsle of Man · 147 kmHigh 16.0°C · Low 14.0°C · 78 mm rain
- Limerick in AugustIreland · 175 kmHigh 18.4°C · Low 12.4°C · 89 mm rain
- Galway in AugustIreland · 186 kmHigh 17.8°C · Low 12.2°C · 91 mm rain
- Derry in AugustUnited Kingdom · 198 kmHigh 17.1°C · Low 11.9°C · 94 mm rain
- Southport in AugustUnited Kingdom · 217 kmHigh 18.2°C · Low 13.7°C · 117 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.