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

September weather forecast and climate
Porthleven, United Kingdom

Sea temperature

In Porthleven, United Kingdom, the average seawater temperature in September is 16.3°C (61.3°F).
Note: Swimming in 16.3°C (61.3°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

Daylight

In September, the average length of the day in Porthleven, United Kingdom, is 12.6h.

What is the sea water temperature in September in Porthleven?

In Porthleven, in September, the average water temperature is 16.3°C (61.3°F). For swimming, a surface water temperature of 16.3°C (61.3°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

What is the average length of the day in September in Porthleven?

The average length of the day in September in Porthleven is 12.6h.
Average sea temperature in September - Porthleven, United Kingdom
  • Average sea temperature in September: 16.3°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 September - Porthleven, United Kingdom
  • Average daylight in September: 12.6h

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