Today's St Catharines sea temperature is 21.9 °C
(Normal for this time of year (within 0.4° of average))
| Mean: | 21.5 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Range: | 18.2 °C to 23.6 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statistics for 01 Aug (1981–2005) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Today, many surfers would wear a shorty .
Warm in and out of the water temperature at St Catharines today, but forecast to be overcast. With sea temperatures of 21 °C and a wind chill of 24 °C, most surfers will choose a shorty or a summer suit or just board shorts.
 Map of current Canada Surface Water Temperatures (based on measurements from oceanographic satellites) |  Map of current Canada 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 St Catharines. 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.
St Catharines sea temperatures peak in the range 18 to 24°C (64 to 75°F) on around the 8th of August and are at their coldest on about the 15th of February, in the range 1 to 2°C (34 to 36°F). St Catharines sea temperatures are highest in early to mid August. Surfers should use a 2mm long sleeve shorty or a 3/2mm spring wetsuit if the wind is up. The coldest sea temperatures at St Catharines 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 February.
Actual sea surface water temperatures close to shore at St Catharines 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 St Catharines. Refer to our detailed weather forecasts for this information.
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