Killarney weather in December
Temperature, rain and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: June – September
What is the weather like in Killarney in December?
In December, Killarney is cold: daytime highs average 9 °C, and nights cool down to about 4 °C. The sun is scarce, with only about 2 hours a day. It rains often – on about 17 days, adding up to 117 mm. All in all, December is not an ideal month for a holiday in Killarney.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 16 | 7 | 4 |
| Day | 11° | 9° | 8° |
| Night | 6° | 4° | 4° |
| Sun | 2 h | 2 h | 2 h |
| Rain days | 17 | 17 | 17 |
More details for December
- Daylight
- 7 h 47 min08:40 – 16:27
- UV index
- 0 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 22 km/haverage daily peakAll months
- Cloud cover
- 79 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+0Europe/Dublin
How the score comes together
- Temperatureweight 50 %10 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 30 %6 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in December
- Warm jacket
- Rain jacket or umbrella
Killarney in December: quick answers
Is Killarney hot in December?
No. In December, Killarney is cold: daytime highs average 9 °C and nights drop to about 4 °C.
Does it rain much in Killarney in December?
It rains often – on about 17 days, adding up to 117 mm.
Killarney month by month
The whole year in KillarneyAll destinations: IrelandWhere to go in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences