Balbriggan — Water Temperature in May

Water Temperature Range

9°C

minimum

11°C

average

13°C

maximum

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Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2025	2024	2023	2022
MAY 1	10°C	10°C	10°C	9°C
MAY 2	9°C	9°C	9°C	9°C
MAY 3	10°C	10°C	10°C	9°C
MAY 4	10°C	10°C	10°C	9°C
MAY 5	10°C	11°C	9°C	9°C
MAY 6	10°C	11°C	10°C	10°C
MAY 7	10°C	11°C	10°C	10°C
MAY 8	10°C	11°C	9°C	10°C
MAY 9	10°C	11°C	9°C	10°C
MAY 10	10°C	11°C	9°C	10°C
MAY 11	11°C	12°C	10°C	10°C
MAY 12	10°C	11°C	9°C	10°C
MAY 13	10°C	11°C	10°C	10°C
MAY 14	11°C	12°C	10°C	10°C
MAY 15	11°C	12°C	11°C	10°C
MAY 16	11°C	12°C	11°C	10°C
MAY 17	11°C	12°C	11°C	10°C
MAY 18	11°C	12°C	11°C	10°C
MAY 19	11°C	12°C	11°C	10°C
MAY 20	11°C	13°C	11°C	11°C
MAY 21	12°C	13°C	11°C	11°C
MAY 22	12°C	13°C	11°C	11°C
MAY 23	12°C	13°C	11°C	11°C
MAY 24	12°C	13°C	11°C	11°C
MAY 25	11°C	13°C	10°C	11°C
MAY 26	11°C	13°C	11°C	11°C
MAY 27	12°C	13°C	11°C	11°C
MAY 28	11°C	13°C	11°C	11°C
MAY 29	11°C	13°C	11°C	11°C
MAY 30	12°C	13°C	12°C	11°C
MAY 31	12°C	13°C	12°C	12°C

May: Climate and Swimming Opportunities

Average Night Air Temperature

7°C

Average Day Air Temperature

15°C

Precipitation Amount per Month

56 mm

Number of Rainy Days

Daylight per Day

16 hrs

Sunshine per Day

6 hrs

Average Wind Speed

16 km/h

Average Humidity

79%

With such a ratio between the average monthly temperatures of water and air, swimming feels very cold and is only for cold-water enthusiasts. Most people will prefer just a brief splash, because warming up afterward can take time.