Dalkey Weather in May
May in Dalkey brings moderate temperatures, with daytime highs of 14°C (57°F) and nights around 9°C (48°F). Quite a bit of rainfall is expected, around 68 mm (2.7 in), so pack an umbrella.
Rainfall in Dalkey in May
Rain is expected on roughly 16 days, totalling around 68 mm (2.7 in) for the month. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Dalkey in May
Daytime temperatures in Dalkey reach 14°C (57°F) in May, dropping to 9°C (48°F) at night. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights drop to 9°C (48°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Dalkey in May
The area experiences a moderate amount of sunshine, with approximately 188 hours of sunlight expected. This means a decent mix of sun and overcast.
Wind Speed in Dalkey in May
Wind speeds average 4 m/s (8 knots) during May. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.
Average water temperature in May
At 10°C (50°F), the water is too cold for most people to swim comfortably. A wetsuit is pretty much essential if you plan to go in.If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Dalkey.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Dalkey's climate page.
Dalkey Temperature in May
Min Temperature
9°C (48°F)
Max Temperature
14°C (57°F)
Water Temperature
10°C (50°F) *
Chance of Rain
53%
Precipitation
68 mm (2.7 in)
Rainy days
16 days
Humidity
68% *
Windspeed
4 m/s (8 knots) *
Sunshine
188 hours *
Percentage Sunshine
42% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Dalkey typically stay consistent throughout May, with daily highs averaging around 14°C (57°F). Nights are cold, with lows typically ranging from 6°C (43°F) to 9°C (48°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Dalkey in May
Browse day-by-day weather records for Dalkey spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Dalkey historical weather extremes in May
The extremes listed below come from historical weather data collected in Dalkey from 1976 through 2026.
- The hottest May day on record in Dalkey reached 24°C (75°F) (May 24, 2026).
- The coldest May day was on May 14, 1993, with a maximum of 6°C (43°F).
- The lowest overnight temperature recorded in May was -3°C (27°F) (May 6, 2012).
Best Places in Ireland in May
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in May →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Dalkey in May
Pack for changing conditions in Dalkey in May. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Rain gear is recommended, you can expect wet weather on multiple days. With water temperatures around 10°C (50°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Dalkey in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Dalkey's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Dalkey climate overview or explore weather in Ireland.
