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

September weather forecast and climate
Cairnryan, United Kingdom

Sea temperature

August and September, with an average sea temperature of 14.3°C (57.7°F), are months with the warmest seawater in Cairnryan, United Kingdom.
Note: Swimming in 14.3°C (57.7°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.

Daylight

In Cairnryan, the average length of the day in September is 12.7h.

What are the months with the warmest sea water in Cairnryan?

Months with the warmest seawater in Cairnryan, United Kingdom, are August and September, with an average sea temperature of 14.3°C (57.7°F).

How cold is the water in September in Cairnryan?

In Cairnryan, the average seawater temperature in September is 14.3°C (57.7°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.

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

In September, the average length of the day in Cairnryan, United Kingdom, is 12.7h.
Average sea temperature in September - Cairnryan, United Kingdom
  • Average sea temperature in September: 14.3°C

Best months for swimming (with the highest average sea temperature) are August and September (14.3°C).
The coldest month (with the lowest average sea temperature) is March (7.8°C).

Average daylight in September - Cairnryan, United Kingdom
  • Average daylight in September: 12.7h

The month with the longest days is June (Average daylight: 17.3h).
The month with shortest days is December (Average daylight: 7.3h).