Today's Second Beach (Port St Johns) sea temperature is 21.6 °C
(1.1° warmer than normal for this time of year)
| Mean: | 20.5 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Range: | 19.2 °C to 21.3 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statistics for 20 Aug (1981–2005) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Today, many surfers would wear a shorty .
The water temperature (21 °C) at Second Beach (Port St Johns) is warm and the air temperature should feel similar (windchill forecast 19 °C). If the sun does come out as forecast, it should feel warm enough to surf in a shorty or a summer wetsuit.
 Map of current South Africa Surface Water Temperatures (based on measurements from oceanographic satellites) |  Map of current South Africa 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 Second Beach (Port St Johns). 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.
Second Beach (Port St Johns) water temperatures peak in the range 24 to 27°C (75 to 81°F) on around the 4th of February and are at their coldest on about the 3rd of August, in the range 19 to 21°C (66 to 70°F). Year round warm water temperatures at Second Beach (Port St Johns) climb to their highest in early February. Even then a rash vest and board shorts should be fine for surfing at any time of year. Second Beach (Port St Johns) water temperatures are coldest at the start of August. Surfers should use a 2mm long sleeve shorty or a 3/2mm spring wetsuit if the wind is up.
Actual sea surface water temperatures close to shore at Second Beach (Port St Johns) 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 Second Beach (Port St Johns). Refer to our detailed weather forecasts for this information.
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