Galway weather in May

May in Galway: cool, a little rain, with clean air — an excellent time to visit.

Updated September 2026 · climate normals from ERA5 reanalysis

Galway🇮🇪 Ireland · British Isles · City83
  1. 55Jan
  2. 58Feb
  3. 64Mar
  4. 74Apr
  5. 83May
  6. 85Jun
  7. 86Jul
  8. 81Aug
  9. 76Sep
  10. 67Oct
  11. 59Nov
  12. 52Dec

#3 of 12 months in Galway · #580 of 1413 destinations to visit in May · comfort 83/100 (tier A)

Days
16°C
Nights
9°C
Wet days
12
Sun
10.2 h
Humidity
75%
Daylight
16 h
Galway, Ireland
Photo: Jonathan Borba · Pexels

Traveller notes on Galway in May

Notes from nearby Clifden (69 km away)

Galway doesn't have its own notes for May yet — these are about Clifden, close enough to share the season.

Forum posters describe May as usually quite nice by Irish standards - typically 15-18C by day - but genuinely variable within a single day: sun, wind, shade and rain can all show up in rotation, with a fully cloudless day called rare even in the year's better months. Posters are consistent on one upside: May brings genuinely long daylight hours, a real plus for exploring the Connemara countryside around Clifden. Standard packing advice given the mix of possible conditions: short and long-sleeve shirts, a couple of jumpers, and crucially a proper three-in-one waterproof coat (a zip-out fleece inner layer inside a waterproof shell) that can flex between a cool, dry day and a genuinely wet, windy one.
Tripadvisor community · May · 1 month ago · about Clifden · Read more on Tripadvisor ↗

Other months in Galway

Forum posters describe January in Galway as very cold, windy, and prone to rain slanting in off the Atlantic, with real potential for snow, ice, and gale-force winds on a given day. Posters are consistent, though, that a good sunny day around 10C isn't dramatically colder than an average summer day here - the range between a bad and good January day is genuinely wide. Posters flag that some attractions and B&Bs close for the month, though the surrounding countryside stays accessible, if often wet and muddy underfoot. Posters consistently recommend proper waterproofs and layers as the essential preparation, describing Irish weather as changeable enough within a single day that flexible clothing matters more than any single forecast. Posters generally rate January as workable with the right gear, but genuinely one of Galway's harsher months.
Tripadvisor community · January · 1 month ago · Read more on Tripadvisor ↗
July in Galway runs to the high teens — around 18°C on average, occasionally into the mid-20s — and the forum's honesty is about rain rather than heat: July can be rainier than May while being warmer, and rain gear is the one thing every poster insists on whatever the month. The record puts it at about fourteen wet days. Their framing is the useful part, though: you will get beautiful days too, and the standing local line is that there is no such thing as bad weather, only bad clothing. A light jacket and a sweater for the evenings.
Tripadvisor community · July · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Galway's card on the map.

Galway climate normals — May

Daytime high16°C / 61°F🙂 cool
Nighttime low9°C / 48°F
Feels like (high)14°C / 57°F
Sea temperature14°C / 57°F🥶 cold sea
Rainfall66 mm / 2.6 in🌦 some rain
Rainy days12 days
Humidity75%💦 very humid
Dew point8°C / 46°F
Sunshine10.2 h/day
Daylight15.9 h
Wind19 km/h / 12 mph
Air quality (US AQI)38🍃 good

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

Crowds in Galway 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.

Busyschool holidays in 4 of the markets that fill it, one of its best months for weather(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Galway'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 weatherGalway's weather peaks May–July.

May includes Galway Early Music Festival.

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Best weatherFair weatherToughest weather

What's on in Galway in May

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Festival

    Galway Early Music Festival

    22–24 May

    Medieval, Renaissance and Baroque music in churches and halls, with street performances, dance and costumed re-enactment around the city centre over a long weekend. Source ↗

What's on around the world in May →

Nearby, and something's on

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

Where is Galway?

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Galway in May — FAQ

Is May a good time to visit Galway?
May in Galway: cool, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Galway on SeasonMap's comfort score (83/100).
What is the weather like in Galway in May?
In May, Galway averages a daily high of 15.9°C and a low of 8.8°C, with about 65.8 mm of rain over roughly 12.4 rainy days.
What is the air quality in Galway in May?
Galway has a mean US Air Quality Index of about 38 in May.

Within 300 km: Dingle's Blasket Islands boats around 1 Apr – 30 Sep, and Killarney's Rally of the Lakes on 1–3 May.