Cool
Average highs are around 8°C, so pack for cooler days.
December verdict
Belfast, Northern Ireland, United Kingdom in December
Weather score14Poor
Poor for holiday weather
Average highs are around 8°C, so pack for cooler days. Sunshine averages 1.2h per day, so this is not one of the brighter months. Rainfall averages 94mm, so some wet days are possible.
December weather
Monthly averages
Temp
8°C
Rain
94mm
Sun
1.2h
Sea
11°C
Weather score
14
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 94mm, so some wet days are possible.
Limited sun
Sunshine averages 1.2h 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 Belfast, Northern Ireland, United Kingdom with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December8°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
December94mm average rain
December is wetter than Belfast's yearly average, so flexible plans matter more.
Driest monthsFebruary to August
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December1.2 hours average sun
December is one of Belfast'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 close to Belfast's yearly sea-temperature average, so swimming comfort is fairly typical.
Warmest seaJuly to October
Sea temperatures are usually near 13°C in this stretch, so swimming comfort is at its strongest.
Weather score
December14 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.
