Donegal weather in August 2025

Expect 63°F 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.

  • 63°F maximum daytime temperature in August in Donegal63
    63°F max day temperature
  • 4 hours of sunshine per day
  • 21 days with some rainfall in August in Donegal21
    21 days with some rainfall
  • 48°F minimum night-time temperature in August in Donegal48
    48°F 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
  • 4.6 inches monthly rainfall in August in Donegal4.6
    4.6 inches of monthly rainfall
  • UV (maximum) index 5 (Moderate) in August in Donegal5
    5 (Moderate) UV index
  • 61°F sea temperature in August in Donegal61
    61°F 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)  |  Imperial (°F)

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More about Ireland

How warm is it in Donegal in August?

Daytime temperatures usually reach 63°F in Donegal in August, falling to 48°F 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 61°F.

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 4.6 inches.

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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