As of Oct 13, parts of 25 provinces remain flooded, bringing the number of affected households to 337,190 and causing 42 fatalities.
The Interior Ministry's Disaster Prevention and Mitigation Department revealed on Sunday that the floods, still ravaging 116 districts, led to the evacuation of 982,799 people.
The sitution in 17 provinces improved, it said, including Chiang Mai, Mae Hong Son and Prachuab Khiri Khan.
Unlike in 2011, many of the affected provinces in this year are in the Northeast and the East.
Deputy Prime Ministr Plodprasop Suraswadi was in Buri Ram on Sunday. A number of 258,597 people in 22 districts in the northeastern province were reportedly affected. Vast agricultural fields - 189,808 rai of rice plantation fields and 48,595 rai for other crops - were devastated.
Water level in Ratchasan district in Chachoengsao rose by 10cm on Sunday, forcing local residents to evacuate from their home. Due to the shortage of boats, some had to resort to any floatable materials.