Weather in September
Sea temperature
September is the month with the warmest seawater in Portland, United Kingdom, with an average sea temperature of 17.1°C (62.8°F).Note: For most individuals, swimming in 17.1°C (62.8°F) is not enjoyable. As the water temperature decreases from 21°C (69.8°F) to 15°C (59°F), breathing control becomes increasingly difficult.
Daylight
In September, the average length of the day is 12h and 37min.On the first day of September in Portland, United Kingdom, sunrise is at 6:24 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:49 pm BST.
Frequently asked questions
What is the month with the warmest sea water in Portland?
The month with the warmest seawater is September, with an average sea temperature of 17.1°C (62.8°F).
What is the sea water temperature in September in Portland?
In Portland, United Kingdom, the average seawater temperature in September is 17.1°C (62.8°F). For most, swimming in 17.1°C (62.8°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).
What is the average length of the day in September in Portland?
In Portland, the average day length in September is 12h and 37min.
When is the sunrise / sunset in September in Portland?
On the first day of September in Portland, sunrise is at 6:24 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:49 pm BST.
Average sea temperature in September
Portland, United Kingdom
- Average sea temperature in September: 17.1°C
The best month for swimming (with the highest average sea temperature) is September (17.1°C).
The coldest month (with the lowest average sea temperature) is March (8.8°C).
Average daylight in September
Portland, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 6min).
Portland, United Kingdom
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