World sea water temperatures

Water temperature in Mystic (CT) in May

Is it warm enough to swim in Mystic in May? Average water temperature in Mystic in May is 51.4°F and therefore is not suitable for comfortable swimming. The warmest sea in Mystic in May is 62.6°F, and the coldest is 44.8°F. Average high air temperature in Mystic in May is 66°F, and average low temperature is 46°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Mystic

Changes water temperature in Mystic in May 2025, 2024

To get an accurate forecast for the water temperature in Mystic for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Mystic, 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 148.9°F49.1°F44.8°F50.5°F
May 248°F48.4°F45.1°F50°F
May 349.3°F48.9°F45.9°F50.5°F
May 448.6°F48.7°F46.2°F50.4°F
May 548.4°F48.6°F46°F50.5°F
May 649.8°F48.7°F46.8°F51.6°F
May 751.3°F47.8°F46.4°F51.8°F
May 852.2°F49.8°F46.9°F52.2°F
May 953.1°F50°F47.8°F53.1°F
May 1054°F50°F47.5°F54°F
May 1152.2°F50°F47.8°F52.9°F
May 1252.7°F50°F48.2°F53.4°F
May 1350.9°F51.8°F48.2°F53.4°F
May 1451.6°F52.9°F48.4°F54.3°F
May 1551.8°F52.9°F49.1°F54.5°F
Day 2025 2024 Min Max
May 1651.4°F51.6°F49.5°F56.1°F
May 1752.7°F52.3°F49.6°F56.1°F
May 1854.9°F52.3°F49.6°F55.9°F
May 1956.1°F52.9°F49.6°F56.5°F
May 2055.2°F55°F50.4°F56.3°F
May 2154.7°F55.2°F50.5°F56.1°F
May 2254.7°F55.4°F50°F55.4°F
May 2354°F55.8°F51.4°F56.1°F
May 2453.8°F55.6°F50.9°F56.7°F
May 2553.6°F58.1°F51.3°F58.1°F
May 2655°F57.7°F51.3°F59°F
May 2753.6°F55.2°F52°F59°F
May 2854.1°F56.1°F52°F60.6°F
May 2954.3°F57.7°F52.2°F61.9°F
May 3054.3°F57.4°F52.7°F61.5°F
May 3155.2°F57.9°F53.6°F62.6°F
Mystic water temp chart in May

Average water temperature in Mystic in May over a decade

20162017201820192020
50.7°F50.9°F49.5°F51.1°F50.2°F
20212022202320242025
51.4°F51.6°F53.4°F52.7°F52.5°F

Mystic sea state in May

Chart comparing the height of waves in Mystic 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 Mystic in May

Weather and climate in Mystic in May

This data display average monthly climate indicators in Mystic in May based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

  • Average HIGH temperature66°F
  • Average LOW temperature46°F
  • Average rainfall days11 days
  • Average rainfall99mm/3.9''
  • Average daylight15h
  • Average sunshine9h
  • Average UV index7

Mystic 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
Noank51.4°F45°F62.6°F
Stonington51.3°F44.4°F62.6°F
New London51.6°F45.3°F62.8°F
Ocean Beach Park51.3°F45.1°F62.6°F
Fishers Island51.3°F44.8°F62.6°F
Watch Hill51.3°F44.4°F62.8°F
Westerly51.3°F44.4°F62.8°F
Misquamicut51.4°F44.4°F63°F
Waterford51.6°F45.3°F62.8°F
Niantic51.8°F45.5°F63°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 Mystic 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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