Galway weather in September
September in Galway: nice, rainy, with clean air — an excellent time to visit.
#5 of 12 months in Galway · #519 of 897 destinations to visit in September · comfort 80/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Galway in September
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Galway climate normals — September
| Daytime high | 17°C / 63°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 53°F | |
| Rainfall | 97 mm / 3.8 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 11°C / 52°F | |
| Sunshine | 6.5 h/day | |
| Daylight | 12.7 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Galway in September — FAQ
- Is September a good time to visit Galway?
- September in Galway: nice, rainy, with clean air — an excellent time to visit. It ranks #5 of 12 months for Galway on SeasonMap's comfort score (80/100).
- What is the weather like in Galway in September?
- In September, Galway averages a daily high of 17°C and a low of 11.4°C, with about 97.3 mm of rain over roughly 13.6 rainy days.
- What is the air quality in Galway in September?
- Galway has a mean US Air Quality Index of about 36 in September.