The best times to visit Portmarnock 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.
Portmarnock Travel Guide
Other Portmarnock Travel Info
Weather in Portmarnock
Average temperatures in Portmarnock 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 Portmarnock, 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.
Portmarnock Temperatures (Fahrenheit)
Portmarnock Temperatures (Celsius)
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.
Portmarnock Perceived Temperature (F)
Portmarnock Perceived Temperature (C)
Average Portmarnock 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.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Portmarnock 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 Portmarnock? 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 Portmarnock 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 Portmarnock.
Snow on the Ground
The graph below shows the average snow on the ground in Portmarnock (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Portmarnock 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 Portmarnock 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 Portmarnock.
The graph below shows wind speed (max and average) in knots.
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|
Is it Safe to Travel to Portmarnock?
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 Portmarnock, 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 Portmarnock 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
Overall Portmarnock 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 Portmarnock, 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 Portmarnock 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.