There are two preailing winds in Tarifa.
Levante is easterly wind that blows from the land. It is generally the stronger of the two winds and can be quite gusty. It is off-shore for most spots in Tarifa so make sure that there is a rescue service available or make sure to pick the right spot before riding.
Westerly wind that blows from the sea. It is usually bit lighter than Levante, but steadier. On most spots in Tarifa it is side-on-shore to on-shore, which makes it very safe but wavey.