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Plum Island water temperature
Plum Island ratings
Quality on a good day: 2.9
Consistency of Surf: 2.5
Difficulty Level: 3.3
Wind and Kite Surfing: 2.0
Crowds: 3.5

Overall: 2.8

See all 18 ratings

Based on 7 votes. Vote

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Plum Island Water Temperature and Wetsuit Guide

(Massachusetts, USA)

Today's Plum Island sea temperature is 7.1 °C.

Statistics for 19 Apr (1981–2005) – mean: 5.6 °C, range: 4.1 °C to 7.1 °C

The water temperature (7 °C) at Plum Island is very cold. Despite the sun, surfers will need to wear a good steamer wetsuit, a neoprene hood, gloves and boots. Relatively mild air temperatures and a windchill factor of (12 °C).

Below is a graph of Historical Sea Surface Temperature for Plum Island. This has been derived from analysis of two decades of oceanographic satellite measurements of nearby open water. We have calculated the average water temperature variation around the year as well as the extremes that have been observed on each date.

Plum Island Water Temperature Graph

All of the graphs for the surf breaks presented on are on the same scale to enable comparison between locations around the world.

Plum Island sea temperatures peak in the range 18 to 22°C (64 to 72°F) on around the 12th of August and are at their coldest on about the 1st of March, in the range 2 to 4°C (36 to 39°F). The maximum Plum Island sea temperatures in the second week of August require something like a 3/2mm fully sealed wetsuit. The coldest sea temperatures at Plum Island mean that you will need a flexible 6/5/4mm wetsuit or a well fitting 5/4mm wetsuit with gloves and 5mm neoprene booties and a hood to surf here at the beginning of March.

Actual sea surface water temperatures close to shore at Plum Island can vary by several degrees compared with these open water averages. This is especially true after heavy rain, close to river mouths or after long periods of strong offshore winds. Offshore winds cause colder deep water to replace surface water that has been warmed by the sun. Air temperature, wind-chill and sunshine should also be considered before deciding on the kind of wetsuit needed to stay warm when surfing at Plum Island. Refer to our detailed weather forecasts for this information.