May
Weather in May
Sea temperature
In Portland, United Kingdom, in May, the average water temperature is 11.4°C (52.5°F).Note: Unprotected swimming in 11.4°C (52.5°F) is dangerous due to potential cold shock. Especially when temperatures go below 10°C (50°F), leading to hyperventilation.
Daylight
In Portland, the average length of the day in May is 15h and 31min.On the first day of May, sunrise is at 5:43 am and sunset at 8:30 pm. On the last day of the month, sunrise is at 5:03 am and sunset at 9:12 pm BST.
Updated: Feb 8, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the sea water temperature in May in Portland?
In Portland, United Kingdom, the average seawater temperature in May is 11.4°C (52.5°F). Swimming in 11.4°C (52.5°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.
What is the average length of the day in May in Portland?
The average day length in May in Portland, United Kingdom, is 15h and 31min.
When is the sunrise / sunset in May in Portland?
In May, on the first day of the month, sunrise is at 5:43 am and sunset at 8:30 pm. On the last day of the month, in Portland, United Kingdom, sunrise is at 5:03 am and sunset at 9:12 pm BST.
Average sea temperature in May
Portland, United Kingdom
- Average sea temperature in May: 11.4°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 May
Portland, United Kingdom
- Average daylight in May: 15h and 3min
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).
