Dalkey Weather in January
During January, Dalkey experiences low daytime temperatures of 9°C (48°F) and cooler nights around 4°C (39°F). As part of the winter season, expect quite a bit of rainfall. Around 81 mm (3.2 in) is typical.
Rainfall in Dalkey in January
You can expect rain on roughly 18 days based on historical data, averaging 81 mm (3.2 in) for the month. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Dalkey in January
Expect highs of 9°C (48°F) in Dalkey in January, with nights dropping to around 4°C (39°F). This month falls in the winter season. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. With overnight lows of 4°C (39°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets. On average, January has the most moderate temperatures of the year.
Sunshine in Dalkey in January
This month sees fewer sunny days, with about 56 hours of sunshine, perfect for those who enjoy cooler temperatures.
Wind Speed in Dalkey in January
Average wind conditions reach 6 m/s (12 knots) in January. This creates notably windy weather that is clearly felt and can influence daily activities. Keep in mind this is an average. Some days are less intense, while others can be quite gusty.
Average water temperature in January
The water temperature is only 10°C (50°F) this month — cold enough that most people will want to stay out. Hardy swimmers may manage a quick dip, but it won't be comfortable.January in Dalkey has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, 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 January
Min Temperature
4°C (39°F)
Max Temperature
9°C (48°F)
Water Temperature
10°C (50°F) *
Chance of Rain
61%
Precipitation
81 mm (3.2 in)
Rainy days
18 days
Humidity
81% *
Windspeed
6 m/s (12 knots) *
Sunshine
56 hours *
Percentage Sunshine
25% *
Daily Historical Temperatures
50-year average (1976-2026)
Based on our historical records, temperatures in Dalkey typically stay consistent throughout January, with daily highs averaging around 9°C (48°F). Nights are cold, with lows around 3°C (37°F).
Average temperatures in January
Daily Historical Precipitation
50-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for Dalkey in January
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 January
According to our 25 years of weather records for Dalkey, the following extremes were recorded between 2000 and 2025.
- The hottest January day on record in Dalkey reached 15°C (59°F) (January 24, 2016).
- On January 7, 2010, Dalkey saw its coldest January day with temperatures maxing out at -3°C (27°F).
- Nighttime temperatures dropped to -9°C (16°F) on January 8, 2010, marking the coldest January night on record.
Best Places in Ireland in January
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in January →
perfect weather
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tolerable
unpleasant
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What to Wear in Dalkey in January
Cold weather calls for smart layering in January. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Prepare for significant rainfall with proper waterproof clothing and shoes. Expect water temperatures of around 10°C (50°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Sunglasses aren't essential this month, though you might want them for the occasional bright moment.What To Do in Dalkey in January
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.
