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Castlebar weather in August 2026
Expect daytime maximum temperatures of 18°C in Castlebar, Ireland in August based on long-term weather averages. There are 4 hours of sunshine per day on average with 20 days with some rainfall and typically 93 mm of rainfall in the month.
- 18°C max day temperature
18 - 4 hours of sunshine per day
- 20 days with some rainfall
20 - 10°C min night temperature
10 - 15 hours of daylight per day
15 - No heat & humidity
0 - 93 mm of monthly rainfall
93 - 5 (Moderate) UV index
5
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Recommended for Ireland
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)
More about Ireland
How hot is it in Castlebar in August?
Daytime temperatures usually reach 19°C in Castlebar in August, falling to 11°C at night.
How sunny is it in Castlebar in August?
There are normally 5 hours of bright sunshine each day in Castlebar in August - that's 34% of daylight hours.
How warm is the sea around Castlebar in August?
The average sea temperature around Castlebar in August is 15°C.
Does it rain in Castlebar in August?
There are usually 16 days with some rain in Castlebar in August and the average monthly rainfall is 71mm.
Castlebar August sunrise & sunset times
Browse the sunrise and sunset times for Castlebar in August 2026. Select a month to view Castlebar sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Saturday, 1st August 2026 | 04:51 | 20:35 |
| Sunday, 16th August 2026 | 05:17 | 20:04 |
| Monday, 31st August 2026 | 05:44 | 19:30 |
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