Osaka — Water Temperature in January
Water Temperature Range
50°F
minimum
57°F
average
64°F
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 |
|---|---|---|---|---|
| JAN 1 | 59°F | 59°F | 59°F | 61°F |
| JAN 2 | 57°F | 57°F | 64°F | 61°F |
| JAN 3 | 59°F | 57°F | 63°F | 61°F |
| JAN 4 | 57°F | 57°F | 63°F | 61°F |
| JAN 5 | 57°F | 57°F | 63°F | 61°F |
| JAN 6 | 57°F | 57°F | 63°F | 61°F |
| JAN 7 | 59°F | 57°F | 61°F | 61°F |
| JAN 8 | 57°F | 57°F | 61°F | 61°F |
| JAN 9 | 57°F | 55°F | 61°F | 61°F |
| JAN 10 | 59°F | 57°F | 61°F | 61°F |
| JAN 11 | 57°F | 57°F | 61°F | 59°F |
| JAN 12 | 57°F | 57°F | 61°F | 59°F |
| JAN 13 | 57°F | 55°F | 59°F | 59°F |
| JAN 14 | 57°F | 57°F | 61°F | 59°F |
| JAN 15 | 57°F | 55°F | 61°F | 59°F |
| JAN 16 | 57°F | 57°F | 59°F | 59°F |
| JAN 17 | 55°F | 57°F | 59°F | 59°F |
| JAN 18 | 57°F | 55°F | 59°F | 59°F |
| JAN 19 | 57°F | 57°F | 59°F | 59°F |
| JAN 20 | 55°F | 55°F | 59°F | 57°F |
| JAN 21 | 57°F | 55°F | 59°F | 57°F |
| JAN 22 | 55°F | 55°F | 59°F | 57°F |
| JAN 23 | 57°F | 55°F | 59°F | 57°F |
| JAN 24 | 57°F | 55°F | 59°F | 57°F |
| JAN 25 | 55°F | 55°F | 59°F | 57°F |
| JAN 26 | 55°F | 55°F | 59°F | 57°F |
| JAN 27 | 57°F | 57°F | 57°F | 59°F |
| JAN 28 | 55°F | 57°F | 55°F | 57°F |
| JAN 29 | 55°F | 55°F | 55°F | 57°F |
| JAN 30 | 54°F | 57°F | 57°F | 57°F |
| JAN 31 | 55°F | 55°F | 55°F | 57°F |
January: Climate and Swimming Opportunities
Average Night Air Temperature
36°F
Average Day Air Temperature
48°F
Precipitation Amount per Month
1.19 in
Number of Rainy Days
11
Daylight per Day
10 hrs
Sunshine per Day
4 hrs
Average Wind Speed
8 mph
Average Humidity
64%
With such a ratio between the average monthly temperatures of water and air, swimming feels very cold and is only for cold-water enthusiasts. Most people will prefer just a brief splash, because warming up afterward can take time.