Based on Euro to Baht that is over a 7% decline based on Dollar to Baht it is over a 12% decline. Both the Euro and Dollar have declined. Germany economy is weakening and the interest rates are going lower. in US interest rates are going lower so both currencies can be expect more weakling.
Don’t expect Baht to weaken during the high season, country needs all the reserve currencies. The Fires in Brazil hurt the sugar industry, so if Thailand can harvest record amounts of sugar expect the baht to stay strong.