Dublin weather in September
September in Dublin: nice, rainy, with clean air — an excellent time to visit.
#5 of 12 months in Dublin · #302 of 604 destinations to visit in September · comfort 80/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Dublin climate normals — September
| Daytime high | 17°C / 63°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 54°F | |
| Feels like (high) | 16°C / 61°F | |
| Rainfall | 98 mm / 3.9 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 12°C / 53°F | |
| Sunshine | 8.1 h/day | |
| Daylight | 12.7 h | |
| Wind | 21 km/h / 13 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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Dublin in September — FAQ
- Is September a good time to visit Dublin?
- September in Dublin: nice, rainy, with clean air — an excellent time to visit. It ranks #5 of 12 months for Dublin on SeasonMap's comfort score (80/100).
- What is the weather like in Dublin in September?
- In September, Dublin averages a daily high of 17.2°C and a low of 12.2°C, with about 98 mm of rain over roughly 14 rainy days.
- What is the air quality in Dublin in September?
- Dublin has a mean US Air Quality Index of about 36 in September.