Hachijojima Island — Water Temperature in May

Water Temperature Range

15°C

minimum

20°C

average

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

14°C

Average Day Air Temperature

24°C

Precipitation Amount per Month

187 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

6 hrs

Average Wind Speed

11 km/h

Average Humidity

72%

With such a ratio between the average monthly temperatures of water and air, swimming feels warm and comfortable even if the day isn’t hot. The water can feel warmer than the air, so getting out may feel a bit cool.