Portland in May
Find out everything about the water temperature in Portland in May. Average, minimum and maximum recorded temperatures as well as daily temperature in May for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in May
Minimum:
48.9 °F
Average:
53.2 °F
Maximum:
57.2 °F
Sea water temperature in Portland in May
In the city of Portland, the month of May is too cold for swimming. The minimum recorded temperature during this month was 48.9°F on May 2, 2018, with an average temperature being 53.2°F and a maximum temperature reaching 57.2°F on May 30, 2024.
| Date | 10 years average | 2024 | 2023 |
|---|---|---|---|
| May 1 | 51.0°F | 51.8°F | 51.5°F |
| May 2 | 51.1°F | 51.8°F | 51.9°F |
| May 3 | 51.2°F | 51.7°F | 51.8°F |
| May 4 | 51.2°F | 52.2°F | 51.8°F |
| May 5 | 51.5°F | 52.8°F | 51.7°F |
| May 6 | 51.7°F | 52.8°F | 52.2°F |
| May 7 | 51.8°F | 52.9°F | 52.0°F |
| May 8 | 52.1°F | 53.2°F | 51.6°F |
| May 9 | 52.2°F | 53.1°F | 51.7°F |
| May 10 | 52.4°F | 53.6°F | 52.3°F |
| May 11 | 52.4°F | 53.6°F | 52.8°F |
| May 12 | 52.4°F | 53.6°F | 53.2°F |
| May 13 | 52.6°F | 53.8°F | 53.2°F |
| May 14 | 52.9°F | 54.1°F | 53.8°F |
| May 15 | 53.1°F | 54.6°F | 53.7°F |
| May 16 | 53.3°F | 55.2°F | 53.6°F |
| May 17 | 53.5°F | 55.1°F | 54.0°F |
| May 18 | 53.5°F | 54.6°F | 53.9°F |
| May 19 | 53.5°F | 55.5°F | 53.8°F |
| May 20 | 53.7°F | 55.5°F | 54.1°F |
| May 21 | 54.0°F | 56.3°F | 54.6°F |
| May 22 | 54.1°F | 56.1°F | 54.8°F |
| May 23 | 54.2°F | 56.3°F | 54.8°F |
| May 24 | 54.4°F | 56.2°F | 54.5°F |
| May 25 | 54.6°F | 55.7°F | 55.3°F |
| May 26 | 54.8°F | 56.2°F | 55.9°F |
| May 27 | 55.0°F | 56.6°F | 56.3°F |
| May 28 | 55.4°F | 56.8°F | 56.8°F |
| May 29 | 55.3°F | 56.5°F | 56.8°F |
| May 30 | 55.6°F | 57.2°F | 56.8°F |
| May 31 | 55.7°F | 57.1°F | 57.1°F |
In an average year, Portland offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in Portland was recorded on September 3, 2022, reaching a 67.0°F. While the coldest temperature occurred on March 5, 2018, dipping to 43.9°F. The average readings by season are 49.8°F in Winter, 50.1°F in Spring, 61.3°F in Summer, and 60.3°F in Autumn.
The average temperature in May is slightly warmer than April's average of 49.7°F. And in June, the temperature is expected to rise further, potentially reaching an average of 58.0°F.
Popular neighboring cities and resorts
| City | Water temperature* | Distance** |
|---|---|---|
| Bristol |
46.4°F
|
62mi |
| Barry |
47.6°F
|
68mi |
| Cardiff |
47.0°F
|
71mi |
| Cherbourg-Octeville |
52.8°F
|
74mi |
* current water temperature in this city
** straight line distance from Portland