Belfast Weather in December

Belfast in December averages 9°C (48°F) during the day and 3°C (37°F) at night. This is part of the winter season, and quite a bit of rainfall is expected this month.

Rainfall in Belfast in December

Historically, December sees about 21 days of rain, with a monthly average of 83 mm (3.3 in). Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.

Temperature in Belfast in December

Daytime highs in Belfast in December reach 9°C (48°F), with nights around 3°C (37°F). December is a notable month of the winter season. It stays cool throughout the day, so warm layers are a good idea from morning to evening. Nights fall to 3°C (37°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Belfast in December

With limited sunshine this month, there are about 39 hours of sun. It's ideal for those who prefer a cooler, cloudier climate.

Wind Speed in Belfast in December

December has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.

Average water temperature in December

The water temperature is only 10°C (50°F) this month — cold enough that most people will want to stay out. Hardy swimmers may manage a quick dip, but it won't be comfortable.

If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Belfast. Our weather planner can help you explore destinations with more pleasant weather conditions.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Ireland, check out our Belfast's climate page.

Belfast Temperature in December

Min Temperature 3°C (37°F)  

Max Temperature 9°C (48°F)  

Water Temperature 10°C (50°F)  

Chance of Rain 69%  

Precipitation 83 mm (3.3 in)  

Rainy days 21 days  

Humidity 90%  

Windspeed 5 m/s (10 knots)  

Sunshine 39 hours  

Percentage Sunshine 15%  

What to Wear in Belfast in December

Dress warmly and in layers for your trip to Belfast in December. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Expect heavy rainfall, so bring good rain protection and waterproof bags. The water temperature sits at about 10°C (50°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. With limited sunshine expected, sunglasses aren't a priority for packing.

What To Do in Belfast in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

4/10

Cycling

4/10

Walking

4/10

Camping

4/10

Outdoor sports

4/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Ireland, check out our Belfast's climate page.

More climate data for Belfast

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Belfast climate overview or explore weather in Ireland.