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Water temperature in New Castle (DE) in May

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Is it warm enough to swim in New Castle in May? Average water temperature in New Castle in May is 60.1°F and therefore is not suitable for comfortable swimming. The warmest sea in New Castle in May is 72°F, and the coldest is 48°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in New Castle

Changes water temperature in New Castle in May 2025, 2024

To get an accurate forecast for the water temperature in New Castle for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in New Castle, 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 161.5°F63.3°F50.5°F63.3°F
May 262.8°F62.4°F50.4°F62.8°F
May 363.7°F63.7°F49.3°F63.7°F
May 462.4°F62.2°F49.6°F62.4°F
May 561.3°F61.5°F49.6°F62.4°F
May 664°F61.2°F49.1°F64°F
May 762.8°F61°F48°F62.8°F
May 861.7°F64.6°F48°F64.6°F
May 961.2°F64°F48.2°F64°F
May 1065.8°F63°F49.1°F65.8°F
May 1165.1°F63°F50.5°F65.1°F
May 1263°F63.1°F51.8°F63.1°F
May 1364.2°F61.9°F52.7°F64.2°F
May 1464.2°F62.6°F53.6°F64.2°F
May 1565.1°F63.1°F54.3°F65.1°F
Day 2025 2024 Min Max
May 1665.7°F63.9°F56.5°F65.7°F
May 1765.7°F64°F55.9°F68.4°F
May 1865.5°F63.7°F55.9°F67.6°F
May 1964.8°F64.9°F56.7°F69.1°F
May 2064.4°F63.7°F56.1°F66.9°F
May 2163.3°F64.9°F56.1°F67.6°F
May 2262.4°F67.3°F55.6°F69.3°F
May 2362.8°F67.8°F55.6°F68.5°F
May 2463°F68.2°F55.6°F68.2°F
May 2563°F68°F56.7°F68.7°F
May 2663°F68.9°F57.7°F68.9°F
May 2763.3°F69.6°F58.3°F70.5°F
May 2863.7°F71.2°F58.3°F71.2°F
May 2963.9°F70.2°F60.4°F70.2°F
May 3063.9°F70.3°F61.5°F70.5°F
May 3163.5°F70.7°F62.8°F72°F
New Castle water temp chart in May

Average water temperature in New Castle in May over a decade

20162017201820192020
56.8°F58.5°F63°F62.4°F58.5°F
20212022202320242025
63.3°F61.9°F62.2°F65.1°F63.5°F

New Castle sea state in May

Chart comparing the height of waves in New Castle 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 New Castle in May

New Castle 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
Delaware City60.8°F48.4°F72.7°F
Carneys Point Township59.5°F47.7°F71.6°F
Penns Grove59.2°F47.5°F70.9°F
Charlestown60.8°F46°F78.6°F
Sandy Cove60.8°F46°F78.6°F
North East60.8°F46.2°F78.8°F
Sea Breeze61.9°F52.2°F72°F
White Crystal Beach61°F46°F79.2°F
Wilmington61.9°F51.8°F72.3°F
Havre De Grace60.8°F46.2°F77.9°F

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  • rural Delaware Bay, middle section, Nantuxent Cove, picture taken at Money Island NJ
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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 New Castle 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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