Montauk water temperature by month

Swimmable from July through August.

Month by month

Month Typical Feels
January 40° brisk
February 39° brisk
March 42° brisk
April 47° brisk
May 55° brisk
June 63° brisk
July 71° refreshing
August 71° refreshing
September 69° refreshing
October 63° brisk
November 54° brisk
December 45° brisk

The year at a glance

swimmable 30° 40° 50° 60° 70° 80° 71° 39° JFMAMJJASOND January: typically 40° — brisk February: typically 39° — brisk March: typically 42° — brisk April: typically 47° — brisk May: typically 55° — brisk June: typically 63° — brisk July: typically 71° — refreshing August: typically 71° — refreshing September: typically 69° — refreshing October: typically 63° — brisk November: typically 54° — brisk December: typically 45° — brisk

The water right now

Typically about 63° in October — brisk.

from the Montauk station on Fort Pond Bay, about 2 miles away

brisk

bath-warm 80° and up perfect 72–79° refreshing 65–71° brisk below 65° 63° typical for October

The reading comes from Fort Pond Bay, on the harbor side of the point, and that water can sit five or six degrees above the open Atlantic. The surf at Ditch Plains is a colder swim than this number.

About this reading

The Montauk station on Fort Pond Bay sits in the bay, which can run a few degrees off the open surf.

Reading from the Montauk station on Fort Pond Bay, about 2 miles away.

Warm water says nothing about surf, rip currents, or bacteria — check local lifeguard flags and advisories.