The highest day temperature in January 2025 was 54°F. The lowest night temperature was 22°F. The average values for day and night temperatures during January were 41.6°F и 36.0°F respectivly.

The average sea surface temperature in January 2025 for Belfast was 47.0°F. The maximum and minimum values were 45.4°F and 49.2°F respectively.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Belfast is 2.4 in. It makes january one of the least rainy months of the year.

The average wind speed in January is 12.3 mph. It makes January one of the most windy months of the year for Belfast.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Belfast in January is 3.0 hours.