South Korea
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Ansan, South Korea

Sea temperature

In Ansan, South Korea, the average seawater temperature in January is 5°C (41°F).
Note: Swimming in 5°C (41°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.


In Ansan, the average length of the day in January is 9.9h.

What is the sea water temperature in January in Ansan?

In Ansan, South Korea, in January, the average water temperature is 5°C (41°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

How many hours of daylight does Ansan have in January?

In January, the average length of the day is 9.9h.
Average sea temperature in January - Ansan, South Korea
  • Average sea temperature in January: 5°C

The best month for swimming (with the highest average sea temperature) is August (23.4°C).
The coldest month (with the lowest average sea temperature) is February (3.3°C).

Average daylight in January - Ansan, South Korea
  • Average daylight in January: 9.9h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).