Today's St Marys Rivermouth sea temperature is 29.2 °C
(Slightly warmer than usual (0.8° above average))
| Mean: | 28.4 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Range: | 27.8 °C to 29.2 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statistics for 16 Jul (1981–2005) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Today, many surfers would wear a rashvest wetsuit.
Sunny with very warm air temperatures, feeling like 29 °C once we account for any wind. Sea temperatures (29 °C) very warm too. Staying comfortable in the water at St Marys Rivermouth won't be a problem, but wear at least a rash-vest to keep the UV off.
 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 St Marys Rivermouth. 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 Marys Rivermouth water temperatures peak in the range 28 to 29°C (82 to 84°F) on around the 24th of July and are at their minimum on about the 1st of March, in the range 19 to 21°C (66 to 70°F). Year round warm water temperatures at St Marys Rivermouth climb to their warmest in the fourth week of July. Even then a rash vest and board shorts should be fine for surfing at any time of year. The minimum St Marys Rivermouth water temperatures at the beginning of March require something like a 3/2mm fully sealed wetsuit.
Actual sea surface water temperatures close to shore at St Marys Rivermouth 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 Marys Rivermouth. Refer to our detailed weather forecasts for this information.
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