Ireland
Galway in May: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Galway in May is climatically mixed. The average daily high is around 16 °C, and the sea is about 12 °C. With about 15 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
40/100 · #4
Warmth
#5
Dryness
#2
Sun
#2
Sea warmth
#7
Published best categories: City break, Active
Galway · MayPhoto: Wolfgang Glock · CC BY-SA 3.0Climate facts
- Average high
- 16 °C
- Average low
- 7 °C
- Sea
- 12 °C
- Rainy days (est.)
- 15 rainy days (est.)
- Sun (est.)
- 6 h/day
- Humidity
- 80 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| April | 12 | 5 | 15 | 73 | 4.8 | 84 | 3.6 | 10 | 30 |
| May (selected) | 16 | 7 | 15 | 75 | 6.1 | 80 | 3.5 | 12 | 40 |
| June | 18 | 10 | 16 | 84 | 6.2 | 78 | 3.5 | 14 | 47 |
How do the previous and next months compare?
Baseline: May (40/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| April | -10 | -3.3 °C | -2.5 °C | -0.3 | -1.6 mm | -1.3 h | +4.7 % | ±0 m/s | -1.9 °C |
| June | +7 | +2.5 °C | +2.6 °C | +0.6 | +8.9 mm | +0.1 h | -1.3 % | -0.1 m/s | +2.2 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Galway in May?
The average daily high is around 16 °C, with an average daily low of about 7 °C.
Can you swim in Galway in May?
The sea is about 12 °C (cold).
Does it rain a lot in Galway in May?
The curated estimate is about 15 rainy days per month, not a directly measured long-term average. Total precipitation averages around 75 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Galway?
No month in Galway reaches the threshold for a clear recommendation in the climate score; the month comparison above shows the differences.