Average Weather in Dublin Ireland
Dublin has a mild humid temperate climate with warm summers and no dry season. The temperature typically varies from 38°F to 67°F over the course of the year, and is rarely below 30°F or above 72°F.
The warm season lasts for 92 days, from June 14 to September 14, with an average daily high temperature above 62°F. The hottest day of the year is July 27, with an average high of 67°F and low of 54°F.
The cool season lasts for 128 days, from November 17 to March 25, with an average daily high temperature below 51°F. The coldest day of the year is February 18, with an average low of 38°F and high of 47°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
The length of the day in Dublin varies extremely over the course of the year. In 2017, the shortest day is December 21, with 7 hours, 30 minutes of daylight; the longest day is June 21, with 17 hours, 0 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:56 AM on June 17, and the latest sunrise is 3 hours, 44 minutes later at 8:40 AM on December 29. The earliest sunset is at 4:06 PM on December 13, and the latest sunset is 5 hours, 51 minutes later at 9:57 PM on June 24.
Daylight saving time (DST) is observed in Dublin during 2017, starting in the spring on March 26, lasting 216 days, and ending in the fall on October 29.
Sunrise & Sunset with Twilight and Daylight Saving Time
In Dublin, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year in Dublin begins around April 2 and lasts for 192 days, ending around October 11. On July 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 51% of the time, and overcast or mostly cloudy 49% of the time.
The cloudier part of the year begins around October 11 and lasts for 173 days, ending around April 2. On January 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 67% of the time, and clear, mostly clear, or partly cloudy 33% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Dublin varies throughout the year.
The wetter season lasts 126 days, from October 4 to February 7, with a greater than 34% chance of a given day being a wet day. The chance of a wet day peaks at 43% on January 1.
The drier season lasts 239 days, from February 7 to October 4. The smallest chance of a wet day is 26% on April 22.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 42% on January 1.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Dublin experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Dublin. The most rain falls during the 31 days centered around October 29, with an average total accumulation of 3.1 inches.
The least rain falls around May 3, with and average total accumulation of 1.7 inches.
Average Monthly Rainfall
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The perceived humidity level in Dublin, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Dublin experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 172 days, from October 8 to March 29, with average wind speeds of more than 7.5 miles per hour. The windiest day of the year is January 3, with an average hourly wind speed of 9.3 miles per hour.
The calmer time of year lasts for 193 days, from March 29 to October 8. The calmest day of the year is July 24, with an average hourly wind speed of 5.7 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Dublin varies throughout the year.
The wind is most often from the south for 38 days, from April 24 to June 1 and for 10 days, from October 5 to October 15, with a peak percentage of 39% on January 6. The wind is most often from the west for 126 days, from June 1 to October 5 and for 191 days, from October 15 to April 24, with a peak percentage of 42% on August 21.
Dublin is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 112 days, from July 1 to October 21, with an average temperature above 56°F. The day of the year with the warmest water is August 20, with an average temperature of 59°F.
The time of year with cooler water lasts for 105 days, from January 14 to April 29, with an average temperature below 48°F. The day of the year with the coolest water is March 8, with an average temperature of 46°F.
Average Water Temperature
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences very significant seasonal variation over the course of the year.
The brighter period of the year lasts for 107 days, from April 29 to August 14, with an average daily incident shortwave energy per square meter above 4.9 kWh. The brightest day of the year is June 14, with an average of 6.0 kWh.
The darker period of the year lasts for 120 days, from October 24 to February 21, with an average daily incident shortwave energy per square meter below 1.6 kWh. The darkest day of the year is December 22, with an average of 0.5 kWh.
Average Daily Incident Shortwave Solar Energy
The area within 2 miles of Dublin is covered by artificial surfaces (95%), within 10 miles by artificial surfaces (43%) and water (21%), and within 50 miles by water (45%) and grassland (30%).
The topography within 2 miles of Dublin contains only modest variations in elevation, with a maximum elevation change of 164 feet, and an average elevation above sea level of 51 feet. Within 10 miles contains large variations in elevation (2,133 feet). Within 50 miles also contains large variations in elevation (3,064 feet).
This report illustrates the typical weather in Dublin, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Dublin.
For each station, the records are are corrected for the elevation difference between that station and Dublin according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Dublin is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Dublin and a given station.
The stations contributing to this reconstruction are: Dublin Airport (61%, 10 kilometers, north), Casement Aerodrome (37%, 14 kilometers, west), and Royal Air Force Valley (1.9%, 114 kilometers, east).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .