Northern Ireland weather in August 2025

Expect daytime maximum temperatures of 18°C in Northern Ireland, UK in August based on long-term weather averages. There are 5 hours of sunshine per day on average with 17 days with some rainfall and typically 89 mm of rainfall in the month.

  • 18°C maximum daytime temperature in August in Northern Ireland (Belfast)18
    18°C max day temperature
  • 5 hours of sunshine per day
  • 17 days with some rainfall in August in Northern Ireland (Belfast)17
    17 days with some rainfall
  • 11°C minimum night-time temperature in August in Northern Ireland (Belfast)11
    11°C min night temperature
  • 15 hours of daylight per day in August in Northern Ireland (Belfast)15
    15 hours of daylight per day
  • No heat & humidity in August in Northern Ireland (Belfast)0
    No heat & humidity
  • 89 mm monthly rainfall in August in Northern Ireland (Belfast)89
    89 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in August in Northern Ireland (Belfast)5
    5 (Moderate) UV index
  • 13°C sea temperature in August in Northern Ireland (Belfast)13
    13°C sea temperature

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The August weather guide for Northern Ireland (Belfast) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top Northern Ireland destinations

Below are average maximum temperatures at popular countries, regions and places in Northern Ireland in August. Select a holiday destination to see more weather parameters.

All Northern Ireland destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the UK

How hot is it in Northern Ireland in August?

Daytime temperatures usually reach 18°C in Belfast, Northern Ireland in August, falling to 11°C at night.

How sunny is it in Northern Ireland in August?

There are normally 5 hours of bright sunshine each day in Belfast, Northern Ireland in August - that's 32% of daylight hours.

How warm is the sea around Northern Ireland in August?

The average sea temperature around Belfast, Northern Ireland in August is 13°C.

Does it rain in Northern Ireland in August?

There are usually 17 days with some rain in Belfast, Northern Ireland in August and the average monthly rainfall is 89mm.

Northern Ireland August sunrise & sunset times

Browse the sunrise and sunset times for Northern Ireland in August 2025. Select a month to view Northern Ireland sunrise and sunset times for the next 12 months. The Northern Ireland sunrise and sunset times shown below are for Belfast.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:35 20:24
Saturday, 16th August 2025 05:02 19:53
Sunday, 31st August 2025 05:29 19:17

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