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I and Js water temperature
I and Js ratings
Quality on a good day: 2.0
Consistency of Surf: 3.0
Difficulty Level: 3.0
Crowds: 4.0

Overall: 3.0

See all 18 ratings

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I and Js Water Temperature and Wetsuit Guide

(Cape Town, South Africa)

Today's I and Js sea temperature is 15.2 °C.

Statistics for 23 Jul (1981–2005) – mean: 15.7 °C, range: 13.9 °C to 16.6 °C

The water temperature (15 °C) at I and Js is quite cool. If the sun shines as we have forecast, it should feel warm enough to surf in a good spring wetsuit. Effective windchill factor of (16 °C) will make the air and water feel about the same temperature.

South Africa Sea Water Temperature

Map of current South Africa
Surface Water Temperatures
based on measurements from oceanographic satellites
South Africa Water Temperature Anomaly

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 I and Js. 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.

I and Js Water Temperature Graph

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.

I and Js sea temperatures peak in the range 19 to 22°C (66 to 72°F) on around the 31st of January and are at their coldest on about the 29th of July, in the range 13 to 17°C (55 to 63°F). I and Js sea temperatures are warmest at the end of January. Surfers should use a 2mm long sleeve shorty or a 3/2mm spring wetsuit if the wind is up. The coldest seasonal sea temperatures at I and Js in late July lend themselves to a 4/3mm wetsuit or a 3/2mm suit and 3mm neoprene boots.

Actual sea surface water temperatures close to shore at I and Js 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 I and Js. Refer to our detailed weather forecasts for this information.