Dublin weather by month
Dublin runs from about 6°C in January to 16°C in August, with March the wettest month at 135 mm.
warmest month
August
16°C
coolest month
January
6°C
wettest month
March
135 mm
worst air month
March
8 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 6°C | 66 mm | 109 h | 5 |
| February | 8°C | 75 mm | 120 h | 6 |
| March | 8°C | 135 mm | 181 h | 8 |
| April | 10°C | 105 mm | 240 h | 7 |
| May | 13°C | 73 mm | 321 h | 6 |
| June | 14°C | 48 mm | 337 h | 5 |
| July | 15°C | 90 mm | 287 h | 5 |
| August | 16°C | 85 mm | 306 h | 6 |
| September | 13°C | 70 mm | 222 h | 5 |
| October | 12°C | 89 mm | 182 h | 6 |
| November | 9°C | 73 mm | 85 h | 4 |
| December | 8°C | 68 mm | 97 h | 5 |
About 2,487 hours of sun a year. Roughly 100 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.