Kilkenny weather in September

September in Kilkenny: cool, a little rain, with clean air — a great time to visit.

Updated September 2026 · climate normals from ERA5 reanalysis

Kilkenny🇮🇪 Ireland · British Isles · City78
  1. 56Jan
  2. 60Feb
  3. 66Mar
  4. 75Apr
  5. 83May
  6. 87Jun
  7. 89Jul
  8. 86Aug
  9. 78Sep
  10. 69Oct
  11. 61Nov
  12. 53Dec

#5 of 12 months in Kilkenny · #765 of 1413 destinations to visit in September · comfort 78/100 (tier B)

Days
17°C
Nights
11°C
Wet days
12
Sun
6.9 h
Humidity
83%
Daylight
13 h
Kilkenny, Ireland
Photo: Jay's Photography · Pexels

Traveller notes on Kilkenny in September

Other months in Kilkenny

Forum posters describe January in Ireland as bringing a better-than-average chance of snow and real ice risk, with main and most secondary roads gritted but minor roads still requiring caution. Posters are direct that the biggest practical issue is how short the days run, with some days barely seeming to get properly light at all, and typical temperatures sitting in the 40sF (around 4-9C) alongside wet, drizzly conditions. Posters specifically recommend Kilkenny as a well-suited January destination since it's easily reached from Dublin and every attraction can be covered on foot, making it a practical, compact city pick for winter's short daylight hours. Posters generally recommend leaning on Kilkenny's walkable city center, pubs and indoor sites as the main plan for a January visit rather than fighting the weather.
Tripadvisor community · January · 1 month ago · Read more on Tripadvisor ↗
Forum regulars call July Ireland's driest month on paper, but still expect drizzle - one visitor described hail, strong winds, thunder and sun all within 8 hours, and the recurring line is that a forecast is only reliable about 48 hours out at best. The standard packing list: a light jacket and sweater for cool nights, proper rain gear with a hooded waterproof top rather than an umbrella (which regulars call impractical in Irish towns and cities). July also draws the year's biggest crowds to nearby tourist hubs like Killarney, with several posters suggesting September instead for a similar climate with noticeably fewer visitors.
Tripadvisor community · July · 1 month ago · Read more on Tripadvisor ↗

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Kilkenny climate normals — September

Daytime high17°C / 62°F🙂 cool
Nighttime low11°C / 51°F
Feels like (high)15°C / 59°F
Rainfall79 mm / 3.1 in🌦 some rain
Rainy days12 days
Humidity83%💦 very humid
Dew point11°C / 51°F
Sunshine6.9 h/day
Daylight12.7 h
Wind19 km/h / 12 mph
Air quality (US AQI)35🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Kilkenny 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)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Kilkenny'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 weatherKilkenny's weather peaks June–August, best around July.

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Best weatherFair weatherToughest weather

Nearby, and something's on

Within 300 km of Kilkenny — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Kilkenny?

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Kilkenny in September — FAQ

Is September a good time to visit Kilkenny?
September in Kilkenny: cool, a little rain, with clean air — a great time to visit. It ranks #5 of 12 months for Kilkenny on SeasonMap's comfort score (78/100).
What is the weather like in Kilkenny in September?
In September, Kilkenny averages a daily high of 16.9°C and a low of 10.6°C, with about 79.1 mm of rain over roughly 12.2 rainy days.
What is the air quality in Kilkenny in September?
Kilkenny has a mean US Air Quality Index of about 35 in September.

Within 300 km: Dublin's Culture Night around 15–25 Sep, and Killarney's Red deer rut around 25 Sep – 25 Oct.