http://www.gotarifa.com/en/tarifa/climate.html
Weather & Climate conditions for Tarifa Cadiz
An overview of the weather & climate conditions in Tarifa Cadiz
Geographical circumstances are responsible for the very comfortable climate in Tarifa all year around.
In the winter it doesn't get much colder than 15°C and in the day time it can easily reach 20°C or more. Between January and April you have to expect rain as well.
Around midsummer you hardly feel the more than 30°C because of the water cooled wind coming from the sea.
But be aware: it's easy to get a bad sun burn quickly. For water sports it's enough to wear a short neoprene suit in the summer, from October till April a long suit (at least 3mm thick) is more recommendable.