54°F is cold water
A 5mm+ wetsuit for any real time in the water.
Sea temperature drives everything from what fish are biting to how long you can safely stay in. It lags the air by weeks, so a warm day doesn’t mean warm water. Check it before you swim, dive, or head out.
Know before you go
Water temps, tides, and conditions worth knowing for your spots, plus the occasional Pathr update. No spam.
Pathr nautical charts
Explore water temperatures on the chart
Select a coastal location on Pathr’s nautical chart to check the latest available NOAA or NDBC water temperature. Readings may come from a nearby sensor when a spot has none of its own.
Nearby water temperatures
Frequently asked
What is the water temperature at Portsmouth right now?+
The latest reading near Portsmouth, New Hampshire is about 54°F, from Seavey Island, ME buoy SEIM1. A 5mm+ wetsuit for any real time in the water.
Is the water warm enough to swim at Portsmouth?+
At about 54°F the water is cold. A 5mm+ wetsuit for any real time in the water.
Where does Pathr's water temperature data come from?+
Water temperatures come from NOAA and NDBC sensors. When a spot has no sensor of its own, we use the nearest reporting station. In the Pathr app the temperature shown tracks the station closest to your position on the chart.
Bridge clearances near Portsmouth
Vertical clearance and drawbridge opening schedules for the bridges closest to Portsmouth. Check them against your air draft before you head out.
