66°F is cool water
A 3mm wetsuit keeps most swimmers comfortable.
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.
Nearby water temperatures
Frequently asked
What is the water temperature at Deer Island (south end) right now?+
The latest reading near Deer Island (south end), Massachusetts is about 66°F, from BOSTON 16 NM East of Boston, MA buoy 44013. A 3mm wetsuit keeps most swimmers comfortable.
Is the water warm enough to swim at Deer Island (south end)?+
At about 66°F the water is cool. A 3mm wetsuit keeps most swimmers comfortable.
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 Deer Island (south end)
Vertical clearance and drawbridge opening schedules for the bridges closest to Deer Island (south end). Check them against your air draft before you head out.
You've got the water temp. Now get the whole chart.
Pathr shows this spot live, depth under your keel, wind, tide, and traffic, on one nautical chart.
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