New Castle (NH) water temp

This data the coastal New Castle ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current ocean temperature in New Castle

Water temperature in New Castle today is 62.8°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near New Castle was recorded in 2021 and was 64.6°F, and the coldest was recorded in 2013 at 57.6°F. Sea water temperature in New Castle is expected to drop to 59.2°F in the next 10 days. September average water temperature in New Castle is 62.6°F, the minimum temperature is 57.6°F, and the maximum is 70.2°F.

The swimming season in New Castle lasts only one month - August. During this month, New Castle water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in New Castle in winter reaches 42.3°F, in spring 43.9°F, in summer the average temperature rises to 62.6°F, and in autumn it is 56.5°F.

New Castle water temperature now

The ocean salinity in New Castle is 30.95‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in New Castle for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for New Castle. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast New Castle. Data in table shown for September 25, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in New Castle

New Castle weather forecast

Current temperature and weather

Data in a table show New Castle temperature today (September 25, 2025). For more information and forecast for a few days, go to the weather forecast New Castle.

0-3 h	3-6 h	6-9 h	9-12 h
61.5°F	61.9°F	62.6°F	63.9°F

12-15 h	15-18 h	18-21 h	21-24 h
66°F	66.7°F	66.7°F	68.7°F

New Castle water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in New Castle. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in New Castle on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in New Castle

The nearest beaches and cities from New Castle with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Wallis Sands Beach	62.4°F	66.2°F		2' 11"
Hampton	62.2°F	68°F		3' 1"
Hampton Beach	62.2°F	68°F		3' 1"
Wells	63.1°F	66.2°F		3' 8"
Salisbury	62.2°F	68°F		3' 1"
Drakes Island Beach	62.8°F	66.2°F		3' 8"
Kennebunkport	63.1°F	66.2°F		3' 10"
Newburyport	61.9°F	68°F		2' 9"
Plum Island	62.4°F	68°F		2' 9"
Goose Rocks Beach	63°F	66.2°F		3' 8"

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New Castle Island

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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.