Belfast weather in August
Long-run climate averages for Belfast, Northern Ireland in August, plus what the forecast models say for the days ahead.
In August, Belfast averages 18°C by day and 12°C at night. The wettest month is usually October.
August in Belfast averages a daytime high of 18°C and an overnight low of 12°C, which reads as mild for this part of the world. It is the warmest month of the year here. Across the whole year Belfast sees roughly 1021 mm of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like - for that, see the live Belfast forecast with every model compared and how much they currently agree.
Belfast weather by month
what to expect in Belfast through the year, 1991-2020 averagesHere is Belfast's typical weather in each month: the average daytime high and overnight low in °C, how each month feels, and the wettest month marked. Use it to plan any trip to Belfast by season.
Bottom line: over the last 30 days the European model has been the most accurate forecast for Belfast, scoring 94/100 on our CheckWeather Score, ahead of the Met Office at 84. See the full UK accuracy scoreboard for exactly how every model is tested.
Common questions
How warm is Belfast in August?
Is August a good time to visit Belfast?
Does it rain a lot in Belfast in August?
Climate averages from ERA5 reanalysis. Model accuracy re-scored over a rolling 30 days. Page updated .