Castlebar weather in August 2025

Expect 18°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Castlebar in August. Check more long-term weather averages for Castlebar in August before you book your next holiday to Ireland in 2025/2026.

  • 18°C maximum daytime temperature in August in Castlebar18
    18°C max day temperature
  • 4 hours of sunshine per day
  • 20 days with some rainfall in August in Castlebar20
    20 days with some rainfall
  • 10°C minimum night-time temperature in August in Castlebar10
    10°C min night temperature
  • 15 hours of daylight per day in August in Castlebar15
    15 hours of daylight per day
  • No heat & humidity in August in Castlebar0
    No heat & humidity
  • 93 mm monthly rainfall in August in Castlebar93
    93 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in August in Castlebar5
    5 (Moderate) UV index

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The August weather guide for Ireland (Castlebar) 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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How hot is it in Castlebar in August?

Daytime temperatures usually reach 18°C in Castlebar in August, falling to 10°C at night.

How sunny is it in Castlebar in August?

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

Does it rain in Castlebar in August?

There are usually 20 days with some rain in Castlebar in August and the average monthly rainfall is 93mm.

Castlebar August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:52 20:34
Saturday, 16th August 2025 05:18 20:04
Sunday, 31st August 2025 05:44 19:29

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