Ishikari Water Temperature
The water will feel cool (fresh). Probably too cold for all but seasoned swimmers. We'd recommend a 4mm or 5mm wetsuit if you want to stay in the water.
The measurements for the water temperature in Ishikari, Hokkaidō are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.
Water temp by month
Monthly average max / min water temperatures
The graph below shows the range of monthly Ishikari water temperature derived from many years of historical sea surface temperature data.
The warmest water temperature is in August with an average around 70.3°F / 21.3°C. The coldest month is February with an average water temperature of 40.6°F / 4.8°C.
7 day tide forecast for Ishikari
*These tide times are estimates based on the nearest accurate location (Otaru, Hokkaido, Japan) and may differ by up to half an hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.