Dún Laoghaire monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Dún Laoghaire

Dún Laoghaire average temperature chart (Celsius) Dún Laoghaire average temperature chart (Fahrenheit)
Average monthly temperatures in Dún Laoghaire (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7.7 7.6 9.4 11.3 14.1 17.1 18.8 18.5 16.6 13.8 10 8.5
°F 45.9 45.7 48.9 52.4 57.4 62.8 65.8 65.3 61.9 56.8 49.9 47.4

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Dún Laoghaire monthly rainfall chart (mm) Dún Laoghaire monthly rainfall chart (inches)
Average monthly rainfall in Dún Laoghaire (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 79 62 62 52 62 55 52 70 75 80 79 94
inches 3.1 2.4 2.4 2 2.5 2.2 2 2.8 3 3.1 3.1 3.7
Rainy days 18 15 16 14 16 14 14 16 15 17 16 17

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Dún Laoghaire

Dún Laoghaire average daily sunshine chart
Average daily sunshine Dún Laoghaire
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 2.1 2.9 3.9 5.8 6.8 6.8 6.1 5.8 4.8 3.6 2.7 2

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Dún Laoghaire average minimum / maximum temperatures (Celsius) Dún Laoghaire average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Dún Laoghaire (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 2.8 2.7 3.3 4.5 6.9 9.7 11.5 11.3 9.9 7.9 4.5 3.6
Max °C 7.9 7.8 9.6 11.5 14.3 17.3 19 18.7 16.8 13.9 10.1 8.7
Min °F 37 36.8 37.9 40.1 44.4 49.5 52.6 52.3 49.7 46.2 40.1 38.4
Max °F 41.5 41.4 43.5 46.4 51.1 56.3 59.4 59 55.9 51.6 45.1 43

Sea temperature

The graph below shows the average sea temperature.

Dún Laoghaire average sea temperature chart (Celsius) Dún Laoghaire average sea temperature chart (Fahrenheit)
Average sea temperature around Dún Laoghaire in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.9 7.9 7.7 8.6 10.5 12.8 14.8 15.7 15.3 14.1 12.3 10.5
°F 48 46.2 45.9 47.5 50.8 55.1 58.7 60.2 59.5 57.3 54.2 50.9

Wind speed

The graph below shows the average wind speed.

Dún Laoghaire average winspeed by month (km/h) Dún Laoghaire average winspeed by month (mph)
Average wind speed in Dún Laoghaire (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 24 23 22 19 17 16 16 16 18 20 22 23
mph 15 14 14 12 11 10 10 10 11 12 14 14

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Dún Laoghaire relative humidity averages
Average relative humidity in Dún Laoghaire
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
87% 85% 82% 80% 80% 80% 80% 82% 83% 86% 87% 88%

Other monthly averages

UV index Best time to go?

Dún Laoghaire weather stats

Dún Laoghaire weather statistics
Hottest month: July 18.8°C 65.8°F
Driest month: April 52mm 2ins
Sunniest month: May 6.8hrs
Coldest month: February 7.6°C 45.7°F
Wettest month: December 94mm 3.7ins
Warmest sea: August 15.7°C 60.3°F
Map showing location of Dún Laoghaire (53.29395, -6.13586)

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