Today's Sao Joao sea temperature is 20.6 °C
(Slightly warmer than usual (0.7° above average))
| Mean: | 19.9 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Range: | 18.7 °C to 21.0 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statistics for 16 Jul (1981–2005) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Today, many surfers would wear a shorty .
Sunny with pleasantly warm air temperatures (feeling like 24 °C once we account for wind), and similar sea temperatures (20 °C). Wear boardshorts or a shorty, or better still a thin summer wetsuit to keep the UV off.
 Map of current Portugal Surface Water Temperatures (based on measurements from oceanographic satellites) |  Map of current Portugal 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 Sao Joao. 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.
Sao Joao sea water temperatures peak in the range 20 to 22°C (68 to 72°F) on around the 18th of August and are at their lowest on about the 24th of February, in the range 14 to 16°C (57 to 61°F). Sao Joao sea water temperatures are maximum in the third week of August. Surfers should use a 2mm long sleeve shorty or a 3/2mm spring wetsuit if the wind is up. The lowest sea water temperatures at Sao Joao in the fourth week of February are ideally suited to a 4/3mm wetsuit + 3mm boots, although a 5/3mm wetsuit may be preferable for longer sessions and cold windy days.
Actual sea surface water temperatures close to shore at Sao Joao 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 Sao Joao. Refer to our detailed weather forecasts for this information.
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