Thai Baht weakness has more to do with US Dollar strength than Thai political instability. The US Dollar Index (DXY) has been on a tear since July 14; it is up more than 4.0% in a month! USD/TBD was .0295 a month ago and is now .0281 which is -4.7%.
I guess Sethaput Suthiwartnarueput would say that extra -.7% is due to the political unrest.