Portsmouth Water Temperature
26°C / 80°F
The measurements for the water temperature in Portsmouth, Saint John 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 Portsmouth water temperature derived from many years of historical sea surface temperature data.
The warmest water temperature is in September with an average around 84.9°F / 29.4°C. The coldest month is February with an average water temperature of 80.1°F / 26.7°C.
7 day tide forecast for Portsmouth
*These tide times are estimates based on the nearest accurate location (Roseau, Dominica) and may differ by up to half an hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.