I doubt any kind of turmoil in Thailand is a factor in the exchange rates. I've been observing the rate since the beginning or last year when I went. It was around 24-24.5 and since then I believe its been hovering at the 23-24 mark until now.
Since that time alot has happened, railroads being shut down, the major airport incident, and now pattaya. I don't think its been a factor. Think about it, Thailand's been in turmoil since forever. I guess that just makes it normal for them. Ask any thai and they'll tell you the protests at wherever don't affect them one bit. Plus MAS will never let the sgd appreciate too much