Portmarnock monthly weather averages

Contents

Average daytime temperature

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

Portmarnock average temperature chart (Celsius) Portmarnock average temperature chart (Fahrenheit)
Average monthly temperatures in Portmarnock (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7.5 7.4 9.3 11.3 14.1 17.1 18.8 18.5 16.4 13.5 9.7 8.3
°F 45.4 45.3 48.7 52.3 57.3 62.7 65.8 65.2 61.6 56.4 49.4 46.9

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.

Portmarnock monthly rainfall chart (mm) Portmarnock monthly rainfall chart (inches)
Average monthly rainfall in Portmarnock (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 81 63 64 55 65 59 56 75 78 82 80 94
inches 3.2 2.5 2.5 2.2 2.5 2.3 2.2 3 3.1 3.2 3.2 3.7
Rainy days 18 15 16 15 16 15 14 16 15 17 16 17

Average annual rainfall in Portmarnock: 899.56675mm (354.2 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Portmarnock

Portmarnock average daily sunshine chart
Average daily sunshine Portmarnock
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 2.1 2.8 3.9 5.6 6.6 6.6 5.9 5.6 4.7 3.5 2.7 1.9

Day / night temperatures

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

Portmarnock average minimum / maximum temperatures (Celsius) Portmarnock average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Portmarnock (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 2.4 2.3 3 4.2 6.6 9.4 11.2 11 9.5 7.5 4.1 3.2
Max °C 7.6 7.5 9.5 11.4 14.3 17.3 19 18.7 16.6 13.7 9.8 8.4
Min °F 36.3 36.1 37.3 39.5 43.8 48.9 52.2 51.8 49.1 45.5 39.3 37.7
Max °F 41 40.8 43.2 46 50.7 56 59.2 58.7 55.5 51.1 44.5 42.4

Sea temperature

The graph below shows the average sea temperature.

Portmarnock average sea temperature chart (Celsius) Portmarnock average sea temperature chart (Fahrenheit)
Average sea temperature around Portmarnock 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.

Portmarnock average winspeed by month (km/h) Portmarnock average winspeed by month (mph)
Average wind speed in Portmarnock (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 24 22 22 18 17 16 16 16 18 19 21 23
mph 15 14 14 11 11 10 10 10 11 12 13 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.

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

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Portmarnock weather stats

Portmarnock weather statistics
Hottest month: July 18.8°C 65.8°F
Driest month: April 55mm 2.2ins
Sunniest month: May 6.6hrs
Coldest month: February 7.4°C 45.3°F
Wettest month: December 94mm 3.7ins
Warmest sea: August 15.7°C 60.3°F
Map showing location of Portmarnock (53.42306, -6.1375) Portmarnock map pin © Google

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