Average temperatures, rainfall and packing tips for Belfast, United Kingdom in December
December in Belfast is typically cool, with average daytime highs around 10°C and nights near 5°C. It is one of the cooler months of Belfast's year.
Expect some rain: around 73 mm falls in Belfast during December on average.
If your dates are flexible, the most comfortable months in Belfast are usually July and August.
← Belfast weather tomorrow (live)
In December, Belfast averages a daytime high of about 10°C and a night-time low of around 5°C, based on recent historical data.
Expect some rain: around 73 mm falls in Belfast during December on average.
December is a workable time to visit Belfast, with cool days - just pack accordingly. If your dates are flexible, the most comfortable months in Belfast are usually July and August.