World sea water temperatures

Water temperature in Casco Bay (ME) in May

Is it warm enough to swim in Casco Bay in May? Average water temperature in Casco Bay in May is 48.6°F and therefore is not suitable for comfortable swimming. The warmest sea in Casco Bay in May is 59°F, and the coldest is 42.4°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Casco Bay

Changes water temperature in Casco Bay in May 2025, 2024

To get an accurate forecast for the water temperature in Casco Bay for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Casco Bay, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of May.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
May 144.8°F46.8°F42.4°F47.8°F
May 245.7°F46.8°F42.8°F47.5°F
May 345.5°F46.9°F43.7°F47.3°F
May 445.7°F47.3°F43.9°F48.6°F
May 545.1°F46.9°F44.2°F48.9°F
May 645°F48°F44.4°F48.4°F
May 745.5°F49.6°F44.2°F50°F
May 845.5°F49.5°F44.6°F50.9°F
May 944.4°F48.9°F44.4°F49.6°F
May 1046.6°F48.7°F43.9°F50°F
May 1146.9°F48.2°F44.6°F49.8°F
May 1247.1°F48.4°F43.9°F49.6°F
May 1346.9°F50.4°F43.9°F50.4°F
May 1449.1°F50.2°F44.8°F51.1°F
May 1548.9°F49.3°F45.1°F50.7°F
Day 2025 2024 Min Max
May 1649.6°F49.6°F46°F50.9°F
May 1750.9°F51.3°F45.7°F52.7°F
May 1851.4°F50.7°F45°F52.7°F
May 1950.4°F50.7°F44.6°F53.8°F
May 2049.8°F50.9°F44.8°F54.9°F
May 2148.9°F51.1°F45.1°F55.8°F
May 2248.4°F53.8°F46.6°F56.3°F
May 2347.3°F53.1°F46.8°F57.6°F
May 2447.3°F53.1°F46.6°F57.4°F
May 2548.2°F52.9°F47.5°F56.5°F
May 2649.8°F54.3°F48.2°F59°F
May 2749.6°F53.8°F48.6°F56.8°F
May 2850°F53.4°F48.6°F57.2°F
May 2950.9°F54.5°F48.4°F56.7°F
May 3049.6°F54.3°F48.4°F56.3°F
May 3150.2°F54.7°F48.9°F57.7°F
Casco Bay water temp chart in May

Average water temperature in Casco Bay in May over a decade

20162017201820192020
48.2°F47.1°F49.8°F47.1°F47.7°F
20212022202320242025
50.2°F49.3°F49.5°F50.5°F47.8°F

Casco Bay sea state in May

Chart comparing the height of waves in Casco Bay in May over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in Casco Bay in May

Casco Bay water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in May?

Want to know where the water temperature in May is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Temperature in neighboring cities

The nearest locations with the average water temperature in May. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Bailey Island48.6°F42.4°F58.6°F
Peaks Island48.9°F42.6°F59.7°F
Yarmouth49.1°F42.6°F58.6°F
Portland48.9°F42.4°F59.7°F
Scarborough49.1°F42.4°F60.3°F
Georgetown47.8°F42.1°F57.4°F
Pine Point49.1°F42.4°F60.1°F
Boothbay Harbor47.7°F42.1°F57°F
North Bath48°F42.3°F57°F
Old Orchard Beach49.3°F42.6°F60.3°F

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Casco Bay is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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