SeasonMapClifden (Connemara) weather in September
Ireland
September in Clifden: nice, rainy, with clean air — a great time to visit.
#6 of 12 months in Clifden · #761 of 1383 destinations to visit in September · comfort 78/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Clifden in September
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Clifden climate normals — September
| Daytime high | 16°C / 61°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 54°F | |
| Sea temperature | 16°C / 61°F | 🧊 bracing |
| Rainfall | 102 mm / 4 in | 🌧 rainy |
| Rainy days | 16 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 11°C / 52°F | |
| Sunshine | 7.3 h/day | |
| Daylight | 12.7 h | |
| Wind | 27 km/h / 17 mph | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Clifden in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Shoulder seasonschool holidays in 3 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Clifden's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherClifden's weather peaks May–July.
Best weatherFair weatherToughest weather
What's on in Clifden in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Connemara walking season
15 Apr – 10 Oct · usuallyTrail seasonDiamond Hill in the national park, the Sky Road and the Twelve Bens are at their most reliable from mid-spring to early autumn. Outside that the bog paths hold water and the light runs out mid-afternoon. Source ↗
- Season
Midge season
25 May – 15 Sep · usuallyInsect seasonStill evenings near bog and water are the problem, not the days. Anything with an Atlantic breeze on it stays clear, which is most of the coast road and none of the inland lakes. Source ↗
- Festival
Clifden Arts Festival
17–27 SepMajor festivalIreland's longest-running community arts festival: ten days of poetry, trad and theatre in the town's halls, pubs and church. It keeps Clifden open a fortnight later than it would otherwise be. Source ↗
Nearby, and something's on
Within 300 km of Clifden — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Clifden?
Clifden in September — FAQ
- Is September a good time to visit Clifden?
- September in Clifden: nice, rainy, with clean air — a great time to visit. It ranks #6 of 12 months for Clifden on SeasonMap's comfort score (78/100).
- What is the weather like in Clifden in September?
- In September, Clifden averages a daily high of 16.2°C and a low of 12.4°C, with about 101.7 mm of rain over roughly 15.8 rainy days.
- What is the air quality in Clifden in September?
- Clifden has a mean US Air Quality Index of about 41 in September.
Other months in Clifden
Compare Clifden in September
Warmer or cooler than Clifden in September
Similar destinations in Northern Europe — September
Within 300 km: Dingle's Blasket Islands boats around 1 Apr – 30 Sep, and Killarney's Red deer rut around 25 Sep – 25 Oct.