There were 9,122 new Covid-19 cases and 71 more fatalities recorded during the previous 24 hours, the Public Health Ministry reported on Tuesday morning.
There were 9,006 cases in the general population and 116 among prison inmates.
The number of new cases dropped from the 10,111 announced on Monday, when the country recorded 63 more deaths.
On Monday, 10,731 Covid-19 patients were discharged from hospitals after recovering from the coronavirus.
Since April 1, when the third wave of Covid-19 began, Thailand has treated 1,774,071 Covid-19 patients, 1,651,555 of whom have recovered to date.
Since the pandemic started early last year, there have been 1,802,934 Covid-19 cases, with 1,678,981 complete recoveries so far.
The death toll stood at 18,313 during the third wave and 18,407 since the beginning of the pandemic.
The 71 new fatalities were aged 29 to 101 years and included one Myanmar national and one Cambodian.
Bangkok recorded 10 new deaths while a further nine were reported in the adjacent provinces of Samut Sakhon (3), Samut Prakan (2), Pathum Thani (2) and Nakhon Pathom (2).
Other central plain provinces further from the capital recorded 16 more deaths – in Chon Buri (3), Ratchaburi (2), Prachin Buri (2), Rayong (2), Samut Songkhram (1), Phetchaburi (1), Chanthaburi (1), Kanchanaburi (1), Chachoengsao (1), Sa Kaeo (1) and Suphan Buri (1).
The Northeast had six new fatalities – in Nakhon Ratchasima (2), Udon Thani (1), Chaiyaphum (1), Buri Ram (1) and Si Sa Ket (1).
The South reported 21 more deaths – in Pattani (5), Phuket (3), Surat Thani (2), Yala (2), Chumphon (2), Ranong (2), Satun (1), Nakhon Si Thammarat (1), Trang (1), Narathiwat (1) and Phangnga (1).
The North saw nine new fatalities – in Nakhon Sawan (2), Tak (1), Phitsanulok (1), Chiang Rai (1), Phetchabun (1), Chiang Mai (1), Sukhothai (1) and Uttaradit (1).
The 9,122 new cases included 8,999 local infections and seven imported cases.
Of the local infections, 8,661 were confirmed at hospitals and 338 via mass testing.
Bangkok had 1,037 new cases, followed by 621 in Pattani, 602 in Nakhon Si Thammarat, 498 in Songkhla, 455 in Yala, 453 in Narathiwat, 310 in Chon Buri, 299 in Samut Prakan, 238 in Prachuap Khiri Khan and 229 in Rayong.
Greater Bangkok reported 1,646 new cases and 19 new deaths. Four southern border provinces had 2,027 new cases and eight new fatalities, while 67 other provinces recorded 5,326 new cases and 42 new deaths.
The seven imported cases were from Belgium (1), the United States (1), Finland (2), Sweden (1), Cambodia (1) and Myanmar (1).
On Monday 105,546 people received Covid-19 treatment at hospitals, including 2,762 seriously ill patients and 631 dependent on ventilators.
Global Covid-19 cases rose by 338,411 in 24 hours to 241.88 million. The worldwide death toll went up by 4,856 to 4.92 million.
The US had the most cases at 45.90 million, up 51,178, and the most deaths at 746,415, up 660.