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Grand Marias water temperature
Grand Marias ratings
Quality on a good day: 3.0
Consistency of Surf: 1.5
Difficulty Level: 2.5
Wind and Kite Surfing: 3.0
Crowds: 4.5

Overall: 3.7

See all 18 ratings

Based on 2 votes. Vote

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Grand Marias Water Temperature and Wetsuit Guide

(Lake Superior, USA)

Today's Grand Marias sea temperature is 12.6 °C.

Statistics for 18 Jun (1981–2005) – mean: 6.1 °C, range: 2.9 °C to 11.5 °C

The water temperature (12 °C) at Grand Marias is quite cold. Despite the sun, windchill of 7 °C means that surfers will need plenty of neoprene. Wear a quality winter wetsuit, a neoprene hood, gloves and boots. A windchill factor of (7 °C).

United States Sea Water Temperature

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

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.

Grand Marias 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.

Grand Marias water temperatures peak in the range 12 to 20°C (54 to 68°F) on around the 14th of August and are at their coldest on about the 22nd of March, in the range 1 to 3°C (34 to 37°F). The maximum seasonal water temperatures at Grand Marias in mid August lend themselves to a 4/3mm wetsuit or a 3/2mm suit and 3mm neoprene boots. The coldest 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 the second half of 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.