December · Ireland
Best time to visit Killarney in December Weather, crowds & prices
Weather in Killarney in December
Average temperature 7°C, 166 mm of rain, about 0 days with 6+ hours of sunshine and 94% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
2.9/10
Ranked #12 of 12 months
- Avg temp
- 7°C
- Rainfall
- 166 mm
- Humidity
- 94%
- Days with 6h+ sun
- 0
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
December in Killarney scores 2.9/10 for nature and wildlife travel - ranked #12 of 12. Expect around 7°C, 166 mm of rain, and roughly 0 days with 6+ hours of sunshine this month.
Scenic hub on the Ring of Kerry with mountain lakes, Muckross House, and national park.
December in Killarney: expect compromises
Expect 7°C (44°F) in December. A good month for city streets, viewpoints and long meals; leave swimming for another season.
166 mm of rain signals a properly wet month, with only almost no days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 2.9/10 on the same scale — 12th of 12 months, versus 8.4/10 for the best month here.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a proper rain shell rather than an umbrella, footwear you can get muddy.
Expect low-season pricing, and crowds are light for this destination.
If your dates are flexible, May is materially better in Killarney — 5.5 points higher on the same scale.
Frequently asked
- What is the weather like in Killarney in December?
- In December, Killarney averages 7°C, 166 mm of rain, and about 0 days with 6+ hours of sunshine. Its climate-comfort score is 2.9/10.
- Is December a good time to visit Killarney?
- December earns a 2.9/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Killarney in December?
- Expect about 166 mm of rain in December. Average humidity is 94% and there are about 0 days with 6+ hours of sunshine.
Curated in Killarney
Tickets & experiences
Things to do in Killarney
Killarney, Ireland. Live activities and tours from GetYourGuide, matched to this destination.