Leinster weather in December
December is one of the least pleasant months in Leinster: highs of 8°C (47°F) and about 97 mm (3.8 in) of rain on average. Nights average 5°C (41°F) and cloud cover 76% (NASA POWER, 2001–2025 averages). The sea averages 9°C (47°F). It is the 3rd wettest month of the year and the 3rd coolest. Compared with November, it is cooler and about as wet; January brings highs of 8°C (46°F) and 86 mm (3.4 in) of rain.
Figures are long-term averages for Dublin, the largest city in Leinster. See below for other places.
Is December a good time to visit Leinster?
least pleasant month Weather score 33/100.
December is one of the least pleasant months for weather in Leinster. For better conditions, consider Jun–Sep.
Does it rain a lot in Leinster in December?
Some rain is normal: about 97 mm (3.8 in) falls in an average December. It is the 3rd wettest month of the year.
How warm is Leinster in December?
Days average 8°C (47°F) and nights 5°C (41°F).
Leinster weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 8°C (46°F) | 4°C (39°F) | 86 mm | 78% | 7°C (45°F) | least pleasant |
| February | 8°C (46°F) | 4°C (39°F) | 70 mm | 76% | 8°C (46°F) | least pleasant |
| March | 9°C (48°F) | 4°C (39°F) | 70 mm | 74% | 8°C (47°F) | least pleasant |
| April | 11°C (52°F) | 6°C (42°F) | 61 mm | 73% | 11°C (51°F) | fair |
| May | 14°C (57°F) | 8°C (47°F) | 67 mm | 73% | 14°C (58°F) | fair |
| June | 16°C (62°F) | 11°C (51°F) | 76 mm | 76% | 15°C (60°F) | best |
| July | 18°C (64°F) | 12°C (54°F) | 80 mm | 78% | 17°C (62°F) | best |
| August | 18°C (64°F) | 12°C (54°F) | 91 mm | 78% | 17°C (63°F) | best |
| September | 16°C (61°F) | 11°C (52°F) | 76 mm | 74% | 15°C (60°F) | best |
| October | 13°C (56°F) | 9°C (48°F) | 102 mm | 74% | 13°C (56°F) | fair |
| November | 10°C (50°F) | 7°C (44°F) | 106 mm | 73% | 11°C (52°F) | least pleasant |
| December | 8°C (47°F) | 5°C (41°F) | 97 mm | 76% | 9°C (47°F) | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months
Weather across Leinster in December
Weather can differ a lot within Leinster: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Dublin | 8°C (47°F) | 5°C (41°F) | 97 mm | least pleasant |
| South Dublin | 8°C (47°F) | 5°C (41°F) | 97 mm | least pleasant |
| Tallaght | 8°C (47°F) | 5°C (41°F) | 97 mm | least pleasant |
| Drogheda | 8°C (47°F) | 5°C (41°F) | 97 mm | least pleasant |
| Dundalk | 8°C (46°F) | 4°C (40°F) | 97 mm | least pleasant |
| Swords | 8°C (47°F) | 5°C (41°F) | 97 mm | least pleasant |
| Navan | 7°C (45°F) | 3°C (37°F) | 86 mm | least pleasant |
| Bray | 8°C (46°F) | 5°C (40°F) | 114 mm | least pleasant |
| Dún Laoghaire | 8°C (47°F) | 5°C (41°F) | 97 mm | least pleasant |
| Carlow | 7°C (44°F) | 3°C (37°F) | 104 mm | least pleasant |
| Portlaoise | 7°C (45°F) | 3°C (37°F) | 100 mm | least pleasant |
| Athlone | 7°C (45°F) | 3°C (37°F) | 116 mm | least pleasant |