Tokyo — Water Temperature in May

Water Temperature Range

12°C

minimum

18°C

average

21°C

maximum

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

15°C

Average Day Air Temperature

24°C

Precipitation Amount per Month

138 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

6 hrs

Average Wind Speed

15 km/h

Average Humidity

69%

At such water and air temperatures, swimming feels cool and invigorating. It’s comfortable for a quick dip, and you’ll feel fine as long as you warm up soon after.