Numazu — Water Temperature in January

Water Temperature Range

12°C

minimum

16°C

average

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

January: Climate and Swimming Opportunities

Average Night Air Temperature

2°C

Average Day Air Temperature

9°C

Precipitation Amount per Month

48 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

6 hrs

Average Wind Speed

15 km/h

Average Humidity

54%

With such a ratio between the average monthly temperatures of water and air, swimming usually feels uncomfortably cold. Even a short dip can leave you chilled, especially once you get out into the cool air.