Waterville Weather in May
May in Waterville brings moderate temperatures, with highs of 15°C (59°F) and nights dropping to 9°C (48°F). Rainfall is on the higher side this month, averaging around 98 mm (3.9 in), so keep a rain jacket handy.
Rainfall in Waterville in May
Based on our climate data of the past 30 years, about 19 days of rain are anticipated, with 98 mm (3.9 in) on average. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Waterville in May
Waterville in May gets highs of 15°C (59°F) during the day and drops to 9°C (48°F) at night. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. At 9°C (48°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in Waterville in May
The area enjoys a balanced 180 hours of sunlight, ensuring it's neither too overcast nor too sunny.
Wind Speed in Waterville in May
Wind speeds average 5 m/s (10 knots) during May. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.
Average water temperature in May
The water sits at 11°C (52°F) this month, which is well below what most people consider swimmable. Wetsuits help, but expect it to still feel cold.If you favor pleasant temperatures and minimal rainfall, May is one of the best months to visit Waterville.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Waterville's climate page.
Waterville Temperature in May
Min Temperature
9°C (48°F)
Max Temperature
15°C (59°F)
Water Temperature
11°C (52°F) *
Chance of Rain
62%
Precipitation
98 mm (3.9 in)
Rainy days
19 days
Humidity
73% *
Windspeed
5 m/s (10 knots) *
Sunshine
180 hours *
Percentage Sunshine
42% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Waterville typically stay consistent throughout May, with daily highs averaging around 15°C (59°F). Nights are cool, with lows typically ranging from 8°C (46°F) to 10°C (50°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Waterville in May
Browse day-by-day weather records for Waterville spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Waterville historical weather extremes in May
Based on weather observations in Waterville between 1976 and 2026, these are the recorded extremes during May.
- Waterville recorded its highest May temperature of 31°C (88°F) on May 26, 2026.
- On May 1, 1996, Waterville saw its coldest May day with temperatures maxing out at 7°C (45°F).
- The coldest night in May in Waterville was on May 7, 2021, with a minimum of 1°C (34°F).
Best Places in Ireland in May
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in May →
perfect weather
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tolerable
unpleasant
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What to Wear in Waterville in May
The weather can be unpredictable in May, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. With water temperatures around 11°C (52°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Waterville in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Waterville's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Waterville climate overview or explore weather in Ireland.
