Ishigaki — Water Temperature in April
Water Temperature Range
15°C
minimum
20°C
average
25°C
maximum
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 |
|---|---|---|---|---|
| APR 1 | -10°C | 25°C | 19°C | 19°C |
| APR 2 | 25°C | 19°C | 19°C | 19°C |
| APR 3 | 25°C | 19°C | 19°C | 19°C |
| APR 4 | 25°C | 20°C | 20°C | 20°C |
| APR 5 | 25°C | 19°C | 19°C | 19°C |
| APR 6 | 25°C | 19°C | 19°C | 19°C |
| APR 7 | 24°C | 18°C | 18°C | 18°C |
| APR 8 | 24°C | 19°C | 19°C | 18°C |
| APR 9 | 24°C | 18°C | 18°C | 18°C |
| APR 10 | 25°C | 18°C | 18°C | 17°C |
| APR 11 | 25°C | 18°C | 18°C | 17°C |
| APR 12 | 25°C | 19°C | 19°C | 18°C |
| APR 13 | 25°C | 18°C | 18°C | 18°C |
| APR 14 | 26°C | 19°C | 19°C | 19°C |
| APR 15 | 26°C | 19°C | 19°C | 19°C |
| APR 16 | 26°C | 19°C | 19°C | 19°C |
| APR 17 | 26°C | 19°C | 19°C | 19°C |
| APR 18 | 26°C | 19°C | 19°C | 19°C |
| APR 19 | 26°C | 20°C | 20°C | 19°C |
| APR 20 | 26°C | 20°C | 20°C | 19°C |
| APR 21 | 26°C | 20°C | 20°C | 19°C |
| APR 22 | 26°C | 20°C | 20°C | 19°C |
| APR 23 | 26°C | 20°C | 20°C | 19°C |
| APR 24 | 26°C | 20°C | 20°C | 20°C |
| APR 25 | 26°C | 20°C | 20°C | 20°C |
| APR 26 | 26°C | 20°C | 20°C | 19°C |
| APR 27 | 26°C | 20°C | 20°C | 20°C |
| APR 28 | 25°C | 21°C | 21°C | 21°C |
| APR 29 | 25°C | 20°C | 20°C | 20°C |
| APR 30 | 25°C | 21°C | 21°C | 21°C |
April: Climate and Swimming Opportunities
Average Night Air Temperature
17°C
Average Day Air Temperature
19°C
Precipitation Amount per Month
128 mm
Number of Rainy Days
12
Daylight per Day
13 hrs
Sunshine per Day
4 hrs
Average Wind Speed
12 km/h
Average Humidity
82%
With such a ratio between the average monthly temperatures of water and air, swimming can feel slightly cool at first but still quite doable. It’s more comfortable if the sun is out, and you may want a towel or hoodie right after.