Seoul — Water Temperature in May

Water Temperature Range

8°C

minimum

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