Cool
Average highs are around 9°C, so pack for cooler days.
December verdict
Killarney, Ireland in December
Weather score9Poor
Poor for holiday weather
Average highs are around 9°C, so pack for cooler days. Sunshine averages 1.3h per day, so this is not one of the brighter months. Rainfall averages 166mm, so some wet days are possible.
December weather
Monthly averages
Temp
9°C
Rain
166mm
Sun
1.3h
Sea
11°C
Weather score
9
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 166mm, so some wet days are possible.
Limited sun
Sunshine averages 1.3h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 11°C, so the water can feel cool.
Map
Weather map
Compare Killarney, Ireland with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December9°C average high
December has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
December166mm average rain
December is one of Killarney's wettest months, so rain is likely to be a major planning factor.
Driest monthsApril to August
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December1.3 hours average sun
December is one of Killarney's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsApril to July
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December11°C average sea
December is below Killarney's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 15°C in this stretch, so swimming comfort is at its strongest.
Weather score
December9 weather score
December is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
