Haeju — Water Temperature in May

Water Temperature Range

8°C

minimum

12°C

average

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

12°C

Average Day Air Temperature

21°C

Precipitation Amount per Month

102 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

8 hrs

Average Wind Speed

8 km/h

Average Humidity

67%

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.

Water Temperature in Nearby Locations

Nampo