United Kingdom
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Porthleven, United Kingdom

Sea temperature

In Porthleven, United Kingdom, in January, the average water temperature is 10.4°C (50.7°F).
Note: 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.


The average length of the day in January is 8.6h.

How cold is the water in January in Porthleven?

In January, the average sea temperature in Porthleven is 10.4°C (50.7°F). Swimming in 10.4°C (50.7°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Porthleven have in January?

The average length of the day in January in Porthleven, United Kingdom, is 8.6h.
Average sea temperature in January - Porthleven, United Kingdom
  • Average sea temperature in January: 10.4°C

The best month for swimming (with the highest average sea temperature) is August (17.1°C).
The coldest month (with the lowest average sea temperature) is March (9.7°C).

Average daylight in January - Porthleven, United Kingdom
  • Average daylight in January: 8.6h

The month with the longest days is June (Average daylight: 16.3h).
The month with shortest days is December (Average daylight: 8.2h).