Donegal weather in August 2025

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

  • 17°C maximum daytime temperature in August in Donegal17
    17°C max day temperature
  • 4 hours of sunshine per day
  • 21 days with some rainfall in August in Donegal21
    21 days with some rainfall
  • 9°C minimum night-time temperature in August in Donegal9
    9°C min night temperature
  • 15 hours of daylight per day in August in Donegal15
    15 hours of daylight per day
  • No heat & humidity in August in Donegal0
    No heat & humidity
  • 116 mm monthly rainfall in August in Donegal116
    116 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in August in Donegal5
    5 (Moderate) UV index
  • 16°C sea temperature in August in Donegal16
    16°C sea temperature

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The August weather guide for Ireland (Donegal) 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 Ireland

How warm is it in Donegal in August?

Daytime temperatures usually reach 17°C in Donegal in August, falling to 9°C at night.

How sunny is it in Donegal in August?

There are normally 4 hours of bright sunshine each day in Donegal in August - that's 27% of daylight hours.

How warm is the sea around Donegal in August?

The average sea temperature around Donegal in August is 16°C.

Does it rain in Donegal in August?

There are usually 21 days with some rain in Donegal in August and the average monthly rainfall is 116mm.

Donegal August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:43 20:33
Saturday, 16th August 2025 05:10 20:02
Sunday, 31st August 2025 05:38 19:26

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