In our experience, the best swell angle for Khao Lak is from a SW-W direction however these swells are quite rare as most groundswells come predominantly from a S-SW angle, which refract towards the coast but retain little power. The long range is predicting a small direct groundswell to arrive around May 5th, lets see what happens.
North 0 338-23
Northeast 45 23-68
East 90 68-113
Southeast 135 113-158
South 180 158-203
Southwest 225 203-248
West 270 248-293
Northwest 315 293-338