New Castle Water Temperature
8°C / 46°F
The measurements for the water temperature in New Castle, New Hampshire are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.
Monthly average water temp
Monthly average max / min water temperatures
The graph below shows the range of monthly New Castle water temperature derived from many years of historical sea surface temperature data.
The warmest water temperature is in August with an average around 65.5°F / 18.6°C. The coldest month is March with an average water temperature of 38.5°F / 3.6°C.