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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 1.3 °C.

Statistics for 16 Apr (1981–2005) – mean: 1.9 °C, range: 1.5 °C to 2.4 °C

Very cold water temperature (1 °C) at Union Bay is close to freezing. Despite the sunshine, even with a thick winter wetsuit, neoprene hood, gloves and boots it will be difficult for surfers to stay comfortable in the sea at Union Bay for long today.

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 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.