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Union Bay water temperature
Union Bay ratings
Quality on a good day: 3.0
Consistency of Surf: 2.0
Difficulty Level: 1.0
Crowds: 4.0

Overall: 2.8

See all 18 ratings

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Union Bay Water Temperature and Wetsuit Guide

(Lake Superior, USA)

Today's Union Bay sea temperature is 9.2 °C.

Statistics for 24 May (1981–2005) – mean: 3.1 °C, range: 2.0 °C to 4.8 °C

Don't be deceived by the very warm air temperatures as the water temperature at Union Bay will still be very cold. Surfers should wear a thick winter wetsuit, a neoprene hood, wetsuit gloves and boots. Feeling pleasant out of the water but really cold in the sea today.

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 Union Bay. 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.

Union Bay Water Temperature Graph

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.

Union Bay water temperatures peak in the range 12 to 19°C (54 to 66°F) on around the 14th of August and are at their coldest on about the 15th of March, in the range 1 to 2°C (34 to 36°F). The warmest seasonal water temperatures at Union Bay in mid August lend themselves to a 4/3mm wetsuit or a 3/2mm suit and 3mm neoprene boots. The coldest water temperatures at Union Bay 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 March.

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