SeasonMapKillarney weather in May
Ireland
May in Killarney: cool, a little rain, with clean air — one of the best months to visit.
#1 of 12 months in Killarney · #165 of 1383 destinations to visit in May · comfort 90/100 (tier S)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Killarney in May
Other months in Killarney
Killarney's forum is candid that July weather is genuinely a grab bag — cold, rainy, calm, warm and windy have all been reported in the same month, with wetter conditions than spring and true heatwaves rare. Regulars' consistent advice is layers plus a proper rain jacket, noting July is also the single busiest month locally so accommodation books up fast regardless of forecast.
Add your own note from Killarney's card on the map.
Killarney climate normals — May
| Daytime high | 16°C / 61°F | 🙂 cool |
|---|---|---|
| Nighttime low | 9°C / 48°F | |
| Feels like (high) | 14°C / 57°F | |
| Sea temperature | 15°C / 59°F | 🥶 cold sea |
| Rainfall | 77 mm / 3 in | 🌦 some rain |
| Rainy days | 12 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 9°C / 48°F | |
| Sunshine | 10.8 h/day | |
| Daylight | 15.7 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Killarney in May
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.
BusyRally of the Lakes, school holidays in 4 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Killarney'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).
Best weatherKillarney's weather peaks May–July.
May includes Rally of the Lakes.
Best weatherFair weatherToughest weather
What's on in Killarney in May
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Festival
Rally of the Lakes
1–3 MayMotorsport weekendCrowdedClosuresBook earlyClosed-road stages through the mountains on the May bank holiday weekend, running since 1979. The town is booked out and several of the scenic roads are shut for the days of it. Source ↗
Nearby, and something's on
Within 300 km of Killarney — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Killarney?
Killarney in May — FAQ
- Is May a good time to visit Killarney?
- May in Killarney: cool, a little rain, with clean air — one of the best months to visit. It ranks #1 of 12 months for Killarney on SeasonMap's comfort score (90/100).
- What is the weather like in Killarney in May?
- In May, Killarney averages a daily high of 15.9°C and a low of 8.9°C, with about 76.9 mm of rain over roughly 12.4 rainy days.
- What is the air quality in Killarney in May?
- Killarney has a mean US Air Quality Index of about 36 in May.
Other months in Killarney
Compare Killarney in May
Warmer or cooler than Killarney in May
Similar destinations in Northern Europe — May
Within 300 km: Dingle's Blasket Islands boats around 1 Apr – 30 Sep, and Dublin's Book of Kells timed tickets on 1 Jan – 31 Dec.