Weather in Belfast: August
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Average day temperature: | 63.0°F |
| Average night temperature: | 53.2°F | |
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Sea water temperature: | 57.8°F |
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Number of sunny days: | 3 days |
| Day length: | 13.8 - 15.8 hours | |
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Number of rainy days: | 6 days |
| Precipitation totals: | 3.4 in. | |
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forecast
| Belfast |
temperature
| Belfast |
Air temperature in August, °F
The highest day temperature during August of 2025 was 74°F. At the same time the lowest night temperature was 47°F. Daily and nightly averages during August were 65.7°F and 54.6°F.
Sea water temperature in Belfast in August, °F
The average sea water temperature in August of 2025 was 61.0°F. The highest and lowest sea temperatures during the month were 62.8°F and 58.6°F.
Mostly all days in August are cloudy but sunny and partly cloudy days are also possible.
Precipitation total in August, in.
Precipitation total value in Belfast in August is 3.3 in. Other months of the year show relatively similar values.
The average wind speed value in August is 9.3 mph It makes August one of the least windy months of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in August is: 5.5.
Best time for vacation in Belfast
Belfast on a weather map
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