The highest day temperature in July 2025 was 77°F. The lowest night temperature was 46°F. The average values for day and night temperatures during July were 66.1°F и 55.2°F respectivly.

The average sea surface temperature in July 2025 for Belfast was 60.6°F. The maximum and minimum values were 58.6°F and 63.4°F respectively.

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

Precipitation total in July for Belfast is 3.4 in. It makes july the most rainy month of the year.

The average wind speed in July is 8.4 mph. It makes July the most windless month 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 July is 5.9 hours.