Overall volume dropped as only 30 contracts of 5 percent white rice changed hands compared to last on Friday's 160. The most active November contract settled at 11.24 baht per kg, down from 11.32 baht, with the number of contracts traded falling to 21 from 35.
Open interest for November contracts also fell by 21 contracts to 34. "Players offset contracts to avoid risk as the November cortex will expire next week," one broker said.
Prices also fell in line with the physical market, as there was no fresh demand from overseas buyers to boost prices, brokers said.
Brokers expected prices to fall a little further as the country's main crop will come onto the market in November, when around 20 million tonnes of paddy will be harvested.
However, prices are unlikely to fall below a support level of around 11.00 baht per kg as they are supported by a government intervention scheme, brokers said.
The government has said it will buy 5 percent paddy at 7,100 baht ($173.6) per kg in a state-purchasing scheme due to start on November 1.
On the physical front, Thai 5 percent white rice stood at 11.10 baht per kg, down slightly from last week's 11.15 baht.