Ballycastle weather in August 2025

Expect 17°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Ballycastle in August. Check more long-term weather averages for Ballycastle in August before you book your next holiday to Northern Ireland in 2025/2026.

  • 17°C maximum daytime temperature in August in Ballycastle17
    17°C max day temperature
  • 4 hours of sunshine per day
  • 19 days with some rainfall in August in Ballycastle19
    19 days with some rainfall
  • 10°C minimum night-time temperature in August in Ballycastle10
    10°C min night temperature
  • 15 hours of daylight per day in August in Ballycastle15
    15 hours of daylight per day
  • No heat & humidity in August in Ballycastle0
    No heat & humidity
  • 98 mm monthly rainfall in August in Ballycastle98
    98 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in August in Ballycastle5
    5 (Moderate) UV index
  • 14°C sea temperature in August in Ballycastle14
    14°C sea temperature

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The August weather guide for Northern Ireland (Ballycastle) 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.

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

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More about the UK

How warm is it in Ballycastle in August?

Daytime temperatures usually reach 17°C in Ballycastle in August, falling to 10°C at night.

How sunny is it in Ballycastle in August?

There are normally 4 hours of bright sunshine each day in Ballycastle in August - that's 30% of daylight hours.

How warm is the sea around Ballycastle in August?

The average sea temperature around Ballycastle in August is 14°C.

Does it rain in Ballycastle in August?

There are usually 19 days with some rain in Ballycastle in August and the average monthly rainfall is 98mm.

Ballycastle August sunrise & sunset times

Browse the sunrise and sunset times for Ballycastle in August 2025. Select a month to view Ballycastle sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:33 20:28
Saturday, 16th August 2025 05:01 19:56
Sunday, 31st August 2025 05:29 19:20

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