The best times to visit Dun Laoghaire for ideal weather are

June 18th to September 9th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Dun Laoghaire Travel Info

Weather in Dun Laoghaire

Temperature

Average temperatures in Dun Laoghaire vary somewhat. Considering humidity, temperatures feel cold for most of the year with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 15th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Dun Laoghaire, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally late July where highs are regularly around 67.5°F (19.7°C) with temperatures rarely dropping below 52.2°F (11.2°C) at night.

Dun Laoghaire Temperatures (Fahrenheit)

Key
High
Average
Low

Dun Laoghaire Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Dun Laoghaire Perceived Temperature (F)

Key
High
Average
Low

Dun Laoghaire Perceived Temperature (C)

Key
High
Average
Low

 

Average Dun Laoghaire Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 46.1 41.2 35.3
Feb 47.1 41.6 35.5
Mar 50 42.9 35.3
Apr 55.2 47.3 38.6
May 58.8 51.4 43.5
Jun 63.8 56.1 47.2
Jul 66.4 58.9 51.2
Aug 65.6 58.2 51
Sep 62.2 55.2 47.8
Oct 57.4 51.2 44.1
Nov 50.8 45.7 39.8
Dec 46.8 41.6 35.5

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 7.8 5.1 1.8
Feb 8.4 5.3 1.9
Mar 10 6.1 1.8
Apr 12.9 8.5 3.7
May 14.9 10.8 6.4
Jun 17.7 13.4 8.4
Jul 19.1 14.9 10.7
Aug 18.7 14.6 10.6
Sep 16.8 12.9 8.8
Oct 14.1 10.7 6.7
Nov 10.4 7.6 4.3
Dec 8.2 5.3 1.9

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Dun Laoghaire are March, April, and then February. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid April. For example, on the week of April 16th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in mid November with an average of 3 days of significant precipitation the week of November 12th.

When can you find snow in Dun Laoghaire? Weather stations report a good amount of seasonal snow likely to be deepest around October, especially close to mid December. The best time to ski (if at all) in Dun Laoghaire is often around around October 1st when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Dun Laoghaire.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Dun Laoghaire (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 33% 0.5 2.7
Feb 21% 0.6 1.9
Mar 19% 0.4 2
Apr 20% 0 1.6
May 23% 0 2.2
Jun 24% 0 2.9
Jul 33% 0 3.5
Aug 27% 0 3.7
Sep 22% 0 2.4
Oct 25% 5.1 3.2
Nov 31% 1.8 3.4
Dec 26% 2.9 2.9

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 33 1.3 6.9
Feb 21 1.5 4.8
Mar 19 1 5.1
Apr 20 0 4.1
May 23 0 5.6
Jun 24 0 7.4
Jul 33 0 8.9
Aug 27 0 9.4
Sep 22 0 6.1
Oct 25 13 8.1
Nov 31 4.6 8.6
Dec 26 7.4 7.4

 

Humidity and Wind

Dun Laoghaire has some extremely humid months, and high humidity throughout the year. The least humid month is May (71.5% relative humidity), and the most humid month is December (83.6%).

Wind in Dun Laoghaire is usually moderate. The windiest month is January, followed by December and November. January’s average wind speed of around 13 knots (15 MPH or 24.1 KPH) is considered “a moderate breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid January where average top sustained speeds reach 21.6 knots, which is considered a fresh breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Dun Laoghaire.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 13 Significant breeze 20.8 Strong breeze
Feb 11.3 Significant breeze 18.3 Strong breeze
Mar 11.5 Significant breeze 18.4 Strong breeze
Apr 10.1 Gentle breeze 16.5 Significant breeze
May 11.1 Significant breeze 17.3 Strong breeze
Jun 9.2 Gentle breeze 15.3 Significant breeze
Jul 9.5 Gentle breeze 15.8 Strong breeze
Aug 9.9 Gentle breeze 16.1 Significant breeze
Sep 10 Gentle breeze 16 Strong breeze
Oct 10.5 Gentle breeze 17.1 Strong breeze
Nov 11.8 Significant breeze 18.8 Strong breeze
Dec 12.7 Significant breeze 19.9 Strong breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 81.7%
Feb 81.7%
Mar 75.6%
Apr 72.2%
May 71.5%
Jun 72.7%
Jul 75.4%
Aug 76%
Sep 78%
Oct 80.9%
Nov 83.3%
Dec 83.6%

 

Is it Safe to Travel to Dun Laoghaire?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for Ireland; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Oct 04, 2019.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Dun Laoghaire, Ireland is January, followed by July and February. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Dun Laoghaire in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is slightly extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 68.9 in December means 68.9% of the tourists vs. January.

 

 

Overall Dun Laoghaire Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 62.5°F (16.9°C) and 48.4°F (9.1°C) with warmer temperatures in the later months. Rain is somewhat common with 6 to 7 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.

Summer (June through August)

The middle-year months have comfortably cool weather with high temperatures that are comfortable. These months see the most precipitation with 7 to 10 days of precipitation per month. June – August is the busiest season for tourism in Dun Laoghaire, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 63.4°F (17.4°C) and 46.7°F (8.2°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 7 to 9 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is too cold this time of year in Dun Laoghaire to be enjoyable for warm weather travelers. The average high during this season is between 48.5°F (9.2°C) and 45.1°F (7.3°C). On average, it rains or snows a fair amount: 6 to 10 times per month. These times of year are the second busiest with tourists.

 

Best Times to TravelIreland › Dun Laoghaire, Ireland