I would say not. Travel in August does not compare to trying to get a cheap fare for Thanksgiving week. In this case, I'd grab the lowest fare I could find now.
OP - Is there a reason you need to fly SWA? If not, try another airline. I searched for flights from Logan to Orlando leaving the day after Thanksgiving and returning Nov 30, and you can get a non-stop on American Airlines for $247 RT. That seems pretty reasonable (and quite frankly, preferable to flying SWA).