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Water temperature in New Castle (DE) in January

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Is it warm enough to swim in New Castle in January? Average water temperature in New Castle in January is 37.2°F and therefore is not suitable for comfortable swimming. The warmest sea in New Castle in January is 44.6°F, and the coldest is 31.6°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 January 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 January.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
January 141.5°F41.2°F34.2°F44.6°F
January 241.4°F42.6°F34.2°F44.6°F
January 340.8°F43.7°F34.9°F43.7°F
January 439.9°F41.2°F34.2°F43.3°F
January 539.2°F43.3°F33.8°F43.3°F
January 639°F42.8°F34°F42.8°F
January 737.8°F42.1°F33.8°F42.4°F
January 836°F41.9°F33.3°F41.9°F
January 935.1°F41.4°F33.1°F42.4°F
January 1035.1°F43.9°F32.9°F43.9°F
January 1135.2°F43°F33.3°F43°F
January 1235.2°F42.4°F32.9°F42.4°F
January 1334.3°F41.9°F32.5°F41.9°F
January 1434.3°F42.4°F32.9°F42.4°F
January 1533.8°F41.9°F33.1°F41.9°F
Day 2025 2024 Min Max
January 1633.3°F41°F32.9°F42.1°F
January 1732.9°F39.4°F32.9°F41.2°F
January 1833.4°F38.7°F32.2°F40.6°F
January 1932.9°F35.8°F32.7°F39.7°F
January 2033.3°F36.7°F32.9°F39.9°F
January 2133.4°F36.9°F33.1°F39.9°F
January 2233.4°F36.5°F32.9°F39.6°F
January 2331.6°F35.6°F31.6°F39.4°F
January 2432.4°F35.6°F32.4°F39.7°F
January 2532.4°F37°F32.4°F39.7°F
January 2632.5°F36.3°F32.5°F40.1°F
January 2733.4°F39°F33.1°F39.9°F
January 2832.9°F38.5°F32.9°F39.6°F
January 2934.2°F38.1°F33.1°F40.3°F
January 3033.3°F37.9°F32.5°F41.5°F
January 3133.4°F36.9°F32.7°F41.4°F
New Castle water temp chart in January

Average water temperature in New Castle in January over a decade

20162017201820192020
38.5°F37.4°F34.3°F38.7°F39.6°F
20212022202320242025
38.7°F37.6°F39°F39.9°F35.1°F

New Castle sea state in January

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

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 January?

Want to know where the water temperature in January 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 January. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Delaware City37.4°F31.8°F44.4°F
Carneys Point Township37°F32°F45.1°F
Penns Grove37°F32°F45.1°F
Charlestown36.1°F31.1°F44.2°F
Sandy Cove36.1°F31.1°F44.2°F
North East36.3°F31.1°F44.2°F
Sea Breeze38.3°F30.7°F47.5°F
White Crystal Beach36.3°F31.1°F44.4°F
Wilmington38.3°F30.7°F47.5°F
Havre De Grace36.3°F31.1°F44.2°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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