The highest day temperature in June 2025 was 75°F. The lowest night temperature was 41°F. The average values for day and night temperatures during June were 62.4°F и 51.9°F respectivly.

The average sea surface temperature in June 2025 for Belfast was 56.8°F. The maximum and minimum values were 55.2°F and 59.2°F respectively.

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

Precipitation total in June for Belfast is 3.0 in. It makes june one of the most rainy months of the year.

The average wind speed in June is 8.9 mph. It makes June one of the most windless 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 June is 6.7 hours.