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Dún Laoghaire, Ireland climate
Cfb Oceanic / temperate
Dún Laoghaire has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 20°C, while the coldest is January averaging around 2°C at night. Precipitation is fairly even year-round, totalling about 771 mm. At latitude 53°N, day length swings from 7.3 hours in midwinter to 16.7 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsDún Laoghaire climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 9 | 11 | 13 | 16 | 18 | 20 | 20 | 18 | 14 | 11 | 9 |
| Avg temp (°C) | 5 | 6 | 7 | 9 | 11 | 14 | 16 | 16 | 14 | 11 | 7 | 6 |
| Avg low (°C) | 2 | 2 | 3 | 4 | 7 | 9 | 12 | 11 | 9 | 7 | 4 | 3 |
| Precipitation (mm) | 63 | 56 | 54 | 58 | 58 | 60 | 60 | 67 | 60 | 76 | 86 | 73 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 9 | 11 | 13 | 16 | 18 |
| Avg temp (°C) | 5 | 6 | 7 | 9 | 11 | 14 |
| Avg low (°C) | 2 | 2 | 3 | 4 | 7 | 9 |
| Precipitation (mm) | 63 | 56 | 54 | 58 | 58 | 60 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 20 | 20 | 18 | 14 | 11 | 9 |
| Avg temp (°C) | 16 | 16 | 14 | 11 | 7 | 6 |
| Avg low (°C) | 12 | 11 | 9 | 7 | 4 | 3 |
| Precipitation (mm) | 60 | 67 | 60 | 76 | 86 | 73 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 18 | 16 | 16 | 14 | 14 | 13 | 16 | 16 | 14 | 16 | 17 | 18 |
| Days with low ≤ 0°C (days) | 8 | 8 | 6 | 3 | 0.5 | — | — | — | — | 1 | 4 | 7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 18 | 16 | 16 | 14 | 14 | 13 |
| Days with low ≤ 0°C (days) | 8 | 8 | 6 | 3 | 0.5 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 16 | 14 | 16 | 17 | 18 |
| Days with low ≤ 0°C (days) | — | — | — | 1 | 4 | 7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 77 | 76 | 75 | 74 | 77 | 78 | 77 | 74 | 73 | 73 | 74 |
| Clear days (≤ 30% cloud) | 1 | 1 | 1 | 2 | 2 | 2 | 1 | 0.7 | 1 | 1 | 2 | 1 |
| Partly cloudy days (30–70%) | 9 | 8 | 9 | 8 | 9 | 6 | 7 | 8 | 9 | 11 | 10 | 10 |
| Cloudy days (≥ 70%) | 21 | 19 | 21 | 20 | 20 | 22 | 23 | 22 | 20 | 19 | 18 | 20 |
| Relative humidity (%) | 91 | 90 | 88 | 86 | 84 | 84 | 85 | 86 | 87 | 88 | 91 | 91 |
| Wind speed (m/s) | 5.7 | 5.5 | 4.9 | 4.3 | 4.0 | 3.6 | 3.5 | 3.7 | 4.2 | 5.0 | 5.3 | 5.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 77 | 76 | 75 | 74 | 77 |
| Clear days (≤ 30% cloud) | 1 | 1 | 1 | 2 | 2 | 2 |
| Partly cloudy days (30–70%) | 9 | 8 | 9 | 8 | 9 | 6 |
| Cloudy days (≥ 70%) | 21 | 19 | 21 | 20 | 20 | 22 |
| Relative humidity (%) | 91 | 90 | 88 | 86 | 84 | 84 |
| Wind speed (m/s) | 5.7 | 5.5 | 4.9 | 4.3 | 4.0 | 3.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 77 | 74 | 73 | 73 | 74 |
| Clear days (≤ 30% cloud) | 1 | 0.7 | 1 | 1 | 2 | 1 |
| Partly cloudy days (30–70%) | 7 | 8 | 9 | 11 | 10 | 10 |
| Cloudy days (≥ 70%) | 23 | 22 | 20 | 19 | 18 | 20 |
| Relative humidity (%) | 85 | 86 | 87 | 88 | 91 | 91 |
| Wind speed (m/s) | 3.5 | 3.7 | 4.2 | 5.0 | 5.3 | 5.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Dublin Phoenix Park, a weather station, about 14 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.