Marennes — Water Temperature in May

Water Temperature Range

12°C

minimum

15°C

average

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

11°C

Average Day Air Temperature

20°C

Precipitation Amount per Month

55 mm

Number of Rainy Days

Daylight per Day

15 hrs

Sunshine per Day

7 hrs

Average Wind Speed

17 km/h

Average Humidity

77%

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.