Killarney Weather in December
December in Killarney brings low temperatures, with highs of 10°C (50°F) and nights dropping to 4°C (39°F). It's the rainiest month of the year, so come prepared with waterproof gear.
Rainfall in Killarney in December
The month brings the most rain, so be prepared with an umbrella for the occasional shower. Typically, about 23 days will experience rainfall, with an average of 128 mm (5 in) for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Killarney in December
In December, Killarney gets low temperatures, with highs of 10°C (50°F). Nights cool to around 4°C (39°F). The winter season is characteristic of December. Expect a cold feel throughout the day, not just in the mornings and evenings. Warm layers are essential. At 4°C (39°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in Killarney in December
The month is characterized by fewer sunny days, with roughly 40 hours hours of sunshine. Ideal for those who prefer a cooler, cloudier climate.December in Killarney has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations 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 Killarney's climate page.
Killarney Temperature in December
Min Temperature
4°C (39°F)
Max Temperature
10°C (50°F)
Chance of Rain
76%
Precipitation
128 mm (5 in)
Rainy days
23 days
Humidity
80% *
Sunshine
40 hours *
Percentage Sunshine
17% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Killarney typically stay consistent throughout December, with daily highs averaging around 10°C (50°F). Nights are cold, with lows around 5°C (41°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 Killarney in December
Browse day-by-day weather records for Killarney spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Killarney historical weather extremes in December
According to our 49 years of weather records for Killarney, the following extremes were recorded between 1976 and 2025.
- The hottest December day on record in Killarney reached 16°C (61°F) (December 9, 2025).
- Killarney experienced its chilliest December day on December 21, 2010, reaching only -1°C (30°F).
- Nighttime temperatures dropped to -8°C (18°F) on December 12, 2022, marking the coldest December night on record.
- Peak precipitation in December occurred on December 7, 1982, when 72 mm (2.8 in) of precipitation was measured.
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
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unpleasant
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What to Wear in Killarney in December
Cold weather calls for smart layering in December. 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. With limited sunshine expected, sunglasses aren't a priority for packing.What To Do in Killarney 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 Killarney's climate page.
Temperature Rainfall Sunshine Humidity
See the full Killarney climate overview or explore weather in Ireland.
