Dalkey Weather in December
During December, Dalkey experiences low daytime temperatures of 10°C (50°F) and cooler nights around 5°C (41°F). As part of the winter season, expect quite a bit of rainfall. Around 90 mm (3.5 in) is typical.
Rainfall in Dalkey in December
The climate data from previous years indicates about 17 days of rain, averaging 90 mm (3.5 in) for the month. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.
Temperature in Dalkey in December
Daytime temperatures in Dalkey reach 10°C (50°F) in December, dropping to 5°C (41°F) at night. December is a notable month of the winter season. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. With lows around 5°C (41°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Dalkey in December
This month sees fewer sunny days, with about 51 hours of sunshine, perfect for those who enjoy cooler temperatures.
Wind Speed in Dalkey in December
December sees wind speeds averaging 6 m/s (12 knots). You'll experience strong winds that cause whole trees to sway and require effort when walking against them. As an average, expect variation from moderate breezes to particularly windy days that affect daily routines.
Average water temperature in December
At 11°C (52°F), the water is too cold for most people to swim comfortably. A wetsuit is pretty much essential if you plan to go in.December in Dalkey can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
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 December
Min Temperature
5°C (41°F)
Max Temperature
10°C (50°F)
Water Temperature
11°C (52°F) *
Chance of Rain
58%
Precipitation
90 mm (3.5 in)
Rainy days
17 days
Humidity
83% *
Windspeed
6 m/s (12 knots) *
Sunshine
51 hours *
Percentage Sunshine
23% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Dalkey typically stay consistent throughout December, with daily highs averaging around 10°C (50°F). Nights are cold, with lows around 4°C (39°F).
Average temperatures in December
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 December
Historical weather for Dalkey in December
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 December
Based on 49 years of weather observations in Dalkey between 1976 and 2025, these are the recorded extremes.
- On December 2, 1985, temperatures climbed to 16°C (61°F), marking the warmest December day on record.
- On December 24, 2010, Dalkey saw its coldest December day with temperatures maxing out at -5°C (23°F).
- The lowest overnight temperature recorded in December was -12°C (10°F) (December 25, 2010).
Best Places in Ireland in December
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Dalkey in December
We recommend to layer up for chilly conditions in Dalkey in December. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. The water temperature sits at about 11°C (52°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Sunglasses aren't essential this month, though you might want them for the occasional bright moment.What To Do in Dalkey in December
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.
