Nagasaki — Water Temperature in May

Water Temperature Range

16°C

minimum

19°C

average

23°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	2025	2024	2023	2022
MAY 1	17°C	16°C	18°C	16°C
MAY 2	17°C	17°C	17°C	16°C
MAY 3	17°C	17°C	17°C	17°C
MAY 4	17°C	17°C	18°C	16°C
MAY 5	18°C	17°C	18°C	17°C
MAY 6	18°C	17°C	18°C	18°C
MAY 7	18°C	17°C	18°C	17°C
MAY 8	18°C	17°C	18°C	18°C
MAY 9	18°C	17°C	19°C	17°C
MAY 10	18°C	17°C	19°C	18°C
MAY 11	18°C	17°C	19°C	18°C
MAY 12	18°C	17°C	19°C	18°C
MAY 13	19°C	17°C	19°C	19°C
MAY 14	19°C	18°C	20°C	18°C
MAY 15	19°C	17°C	19°C	19°C
MAY 16	19°C	18°C	19°C	19°C
MAY 17	19°C	18°C	20°C	19°C
MAY 18	19°C	18°C	20°C	18°C
MAY 19	20°C	18°C	20°C	19°C
MAY 20	20°C	18°C	20°C	19°C
MAY 21	20°C	18°C	20°C	19°C
MAY 22	20°C	18°C	20°C	19°C
MAY 23	20°C	18°C	20°C	20°C
MAY 24	20°C	19°C	21°C	19°C
MAY 25	21°C	19°C	21°C	20°C
MAY 26	20°C	19°C	20°C	20°C
MAY 27	21°C	20°C	21°C	19°C
MAY 28	21°C	19°C	20°C	20°C
MAY 29	21°C	20°C	20°C	21°C
MAY 30	21°C	20°C	20°C	20°C
MAY 31	21°C	19°C	21°C	20°C

May: Climate and Swimming Opportunities

Average Night Air Temperature

15°C

Average Day Air Temperature

24°C

Precipitation Amount per Month

149 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

6 hrs

Average Wind Speed

11 km/h

Average Humidity

72%

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.