Mostyn — Water Temperature in May

Water Temperature Range

8°C

minimum

11°C

average

14°C

maximum

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

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	2026	2025	2024	2023
MAY 1	-10°C	12°C	11°C	9°C
MAY 2	12°C	10°C	11°C	10°C
MAY 3	12°C	11°C	11°C	10°C
MAY 4	12°C	10°C	10°C	9°C
MAY 5	12°C	10°C	11°C	9°C
MAY 6	12°C	11°C	12°C	9°C
MAY 7	12°C	10°C	11°C	9°C
MAY 8	12°C	11°C	10°C	10°C
MAY 9	12°C	10°C	11°C	9°C
MAY 10	12°C	11°C	11°C	10°C
MAY 11	12°C	11°C	12°C	10°C
MAY 12	12°C	11°C	12°C	10°C
MAY 13	12°C	11°C	12°C	10°C
MAY 14	13°C	11°C	12°C	10°C
MAY 15	12°C	11°C	12°C	11°C
MAY 16	12°C	11°C	11°C	10°C
MAY 17	13°C	12°C	13°C	10°C
MAY 18	13°C	11°C	12°C	10°C
MAY 19	13°C	11°C	12°C	11°C
MAY 20	13°C	12°C	12°C	11°C
MAY 21	13°C	12°C	13°C	12°C
MAY 22	13°C	12°C	13°C	11°C
MAY 23	14°C	12°C	13°C	12°C
MAY 24	14°C	12°C	13°C	11°C
MAY 25	13°C	12°C	14°C	11°C
MAY 26	15°C	12°C	13°C	11°C
MAY 27	15°C	12°C	13°C	11°C
MAY 28	15°C	12°C	13°C	11°C
MAY 29	15°C	12°C	13°C	11°C
MAY 30	16°C	12°C	13°C	12°C
MAY 31	16°C	13°C	13°C	13°C

May: Climate and Swimming Opportunities

Average Night Air Temperature

7°C

Average Day Air Temperature

16°C

Precipitation Amount per Month

54 mm

Number of Rainy Days

Daylight per Day

16 hrs

Sunshine per Day

6 hrs

Average Wind Speed

16 km/h

Average Humidity

76%

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.