Okinawa — Water Temperature in May

Water Temperature Range

21°C

minimum

24°C

average

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

21°C

Average Day Air Temperature

27°C

Precipitation Amount per Month

235 mm

Number of Rainy Days

Daylight per Day

13 hrs

Sunshine per Day

5 hrs

Average Wind Speed

15 km/h

Average Humidity

82%

At such water and air temperatures, swimming is pleasant and refreshing rather than hot. After you get in, it feels comfortable, and you’ll warm up quickly when you come out.