Belfast Weather in January
January in Belfast brings low temperatures, with highs of 9°C (48°F) and nights dropping to 4°C (39°F). Rainfall is on the higher side this month, averaging around 89 mm (3.5 in), so keep a rain jacket handy.
Rainfall in Belfast in January
Expect around 20 days of rain based on historical data, with 89 mm (3.5 in) average. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Belfast in January
Belfast in January gets highs of 9°C (48°F) during the day and drops to 4°C (39°F) at night. This month falls in the winter season. Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. Nights drop to 4°C (39°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet. The coldest month of the year calls for plenty of warm layers. Be sure to pack your winter gear.
Sunshine in Belfast in January
The month is characterized by fewer sunny days, with roughly 45 hours hours of sunshine. Ideal for those who prefer a cooler, cloudier climate.
Wind Speed in Belfast in January
Average wind conditions reach 5 m/s (10 knots) in January. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.
Average water temperature in January
The water temperature is only 8°C (46°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.January in Belfast has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United Kingdom, check out our Belfast's climate page.
Belfast Temperature in January
Min Temperature
4°C (39°F)
Max Temperature
9°C (48°F)
Water Temperature
8°C (46°F) *
Chance of Rain
68%
Precipitation
89 mm (3.5 in)
Rainy days
20 days
Humidity
89% *
Windspeed
5 m/s (10 knots) *
Sunshine
45 hours *
Percentage Sunshine
18% *
Daily Historical Temperatures
51-year average (1976-2026)
Based on our historical records, temperatures in Belfast typically stay consistent throughout January, with daily highs averaging around 9°C (48°F). Nights are cold, with lows around 2°C (36°F).
Average temperatures in January
Daily Historical Precipitation
51-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for Belfast in January
Browse day-by-day weather records for Belfast spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Belfast historical weather extremes in January
Based on 25 years of weather observations in Belfast between 2000 and 2025, these are the recorded extremes.
- The hottest January day on record in Belfast reached 14°C (57°F) (January 21, 2024).
- The lowest daytime temperature in January was -1°C (30°F), recorded on January 7, 2010.
- The coldest night in January in Belfast was on January 8, 2010, with a minimum of -9°C (16°F).
- The wettest January day on record brought 26 mm (1 in) of precipitation to Belfast (January 27, 2003).
Best Places in the United Kingdom in January
Find out more about the weather in the United Kingdom and which places have the best travel conditions in this month. See all of the United Kingdom in January →
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unpleasant
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What to Wear in Belfast in January
We recommend to layer up for chilly conditions in Belfast in January. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Expect water temperatures of around 8°C (46°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. You can probably leave your sunglasses at home, because sunny days are pretty rare this month.What To Do in Belfast in January
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United Kingdom, check out our Belfast's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Belfast climate overview or explore weather in the United Kingdom.
