Galway weather in May
May in Galway: cool, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in Galway · #344 of 897 destinations to visit in May · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Galway in May
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Galway climate normals — May
| Daytime high | 15°C / 59°F | 🙂 cool |
|---|---|---|
| Nighttime low | 8°C / 47°F | |
| Rainfall | 69 mm / 2.7 in | 🌦 some rain |
| Rainy days | 14 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 9°C / 48°F | |
| Sunshine | 10.2 h/day | |
| Daylight | 15.9 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Galway in May — FAQ
- Is May a good time to visit Galway?
- May in Galway: cool, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Galway on SeasonMap's comfort score (85/100).
- What is the weather like in Galway in May?
- In May, Galway averages a daily high of 15.2°C and a low of 8.3°C, with about 68.9 mm of rain over roughly 14 rainy days.
- What is the air quality in Galway in May?
- Galway has a mean US Air Quality Index of about 38 in May.