Swansea — Water Temperature in May

Water Temperature Range

11°C

minimum

14°C

average

17°C

maximum

Water Temperature Chart for May

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

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

Climate and Swimming Opportunities in Swansea in May

Average Day Air Temperature

15°C

Average Night Air Temperature

6°C

Precipitation Amount per Month

40 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

4 hrs

Average Wind Speed

17 km/h

Average Humidity

70%

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.