Water Temperature Through the Year
Montauk's water temperature swings dramatically from month to month, and getting your wetsuit thickness right makes the difference between a good session and teeth-chattering misery. The Atlantic here doesn't warm up the way you might expect, even in summer. In July and August, the water barely breaks 70 degrees. By December, you're looking at mid-40s. February is brutal: the coldest stretch of the year, with water temps hovering in the low 40s or even dipping to the high 30s on the worst mornings.
If you're serious about surfing Montauk year-round, you need to own or rent multiple wetsuits. Renting from a local shop gives you the option to swap thickness depending on the season, which beats being stuck with one suit that works for exactly three months.
Spring and Fall: The In-Between Seasons
April through May, the water climbs from the mid-50s toward 60. A 4/3 wetsuit handles April fine, but by late May you might drop to a 3/2 for morning sessions. September and October mirror this pattern in reverse: start the month in the low 60s with a 3/2, but expect to size back up to 4/3 by late October as the Atlantic cools fast.
Fall is actually one of the best times to be in the water here, not just for temperature but for actual waves. The transition into autumn brings consistent Atlantic swells. Locals often say September and October are the most reliable surf months of the year.
Summer and Winter Extremes
June through August requires a 3/2 at most, often a 2/2 for purists who don't mind cold water. Morning sessions are colder than afternoon, so adjust your routine if you're sensitive. Bootees are optional in summer but become essential by November.
November through March demands a 5/4 or 6/5 with hood, booties, and gloves. There's no getting around it. February is non-negotiable 6/5 territory. Even then, you'll spend time on the beach warming up between sessions. Local surfers who work it year-round know to layer, take shorter sessions, and plan recovery time. Hypothermia isn't a joke in midwinter Montauk.
If you're planning to visit for a surf trip, check the season before you book. Summer visitors expecting warm water often arrive unprepared. Winter visitors expect hardship and usually get exactly that. Shoulder seasons—April and October—offer the best balance of manageable cold and good swells.
Local tip: Rinse your wetsuit thoroughly in fresh water after each session, especially in winter. Salt and cold exposure break down neoprene fast. A 6/5 that lasts two years if cared for might last six months if you leave it in your car wet.
Check what accommodations suit your trip length and plan accordingly.