Temperature
Cold by day, cold at night.
Cold days.

Cold by day, cold at night.
Several rainy days. About 13 wet days this month.
A mix of sunshine and cloud.
Humidity is rarely noticeable in the cool air.
In February, afternoons feel about 38° and nights feel near 33°.
Mostly cloudy skies this month.
Breezy February days can feel brisker in open spots.
February late afternoons are around 47°F, easing to about 44°F in early evening.
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 47 | 39 | 2.4 | 11 | 4.1 | 84 |
| Feb | 50 | 42 | 2.4 | 13 | 5.8 | 82 |
| Mar | 52 | 42 | 2.4 | 14 | 7.7 | 80 |
| Apr | 55 | 43 | 2.7 | 12 | 9.8 | 78 |
| May | 60 | 49 | 2.5 | 13 | 11.3 | 78 |
| Jun | 65 | 53 | 2.4 | 11 | 11.2 | 78 |
| Jul | 67 | 56 | 3.1 | 15 | 10.4 | 79 |
| Aug | 67 | 56 | 2.3 | 11 | 9.5 | 81 |
| Sep | 63 | 53 | 3.7 | 14 | 8.3 | 82 |
| Oct | 58 | 50 | 3.8 | 16 | 6.2 | 83 |
| Nov | 52 | 45 | 2.8 | 12 | 4.7 | 85 |
| Dec | 49 | 42 | 2.8 | 13 | 3.7 | 85 |
Similar climates
Want a side-by-side climate view? Compare Portmarnock with Amsterdam.
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jul 31, 2026
Data & methodology