Grand Marias Water Temperature and Wetsuit Guide

The water temperature (6 °C) at Grand Marias 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 (13 °C).

Map of current United States Surface Water Temperatures based on measurements from oceanographic satellites

Map of current United States Sea Water Temperature Anomalies (compared with long term averages at this time of year)

(click thumbnails to expand)

Below is a graph of Historical Sea Surface Temperature for Grand Marias. 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.

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

Grand Marias sea water temperatures peak in the range 12 to 20°C (54 to 68°F) on around the 13th of August and are at their lowest on about the 21st of March, in the range 1 to 3°C (34 to 37°F). The maximum seasonal sea water temperatures at Grand Marias in the third week of August lend themselves to a 4/3mm wetsuit or a 3/2mm suit and 3mm neoprene boots. The lowest sea water temperatures at Grand Marias 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 in mid to late March.

Actual sea surface water temperatures close to shore at Grand Marias 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 Grand Marias. Refer to our detailed weather forecasts for this information.