Another all-time daily high of 11,784 Covid-19 cases, along with 81 fatalities, were recorded over the previous 24 hours, the Public Health Ministry reported on Monday morning.
Monday marked the fourth consecutive day the new caseload broke the record, with the previous daily high the 11,397 reported on Sunday.
There were 11,684 cases in the general population and 100 among prison inmates.
Since April 1, when the third wave of Covid-19 began, the number of new patients has reached 386,307, 262,225 of whom have recovered.
Since the pandemic started early last year, there have been 415,170 Covid-19 cases, 289,651 of whom recovered.
The death toll was at 3,328 in the third wave and 3,422 from the beginning of the pandemic.
The Centre for Covid-19 Situation Administration (CCSA) said Bangkok logged the most new infections -- 2,134 -- followed by Samut Sakhon (765), Chon Buri (615), Saraburi (494) and Pathum Thani (485).
The capital recorded 26 deaths, while the remainder were distributed among 26 other provinces, according to the CCSA.
Six illegal Thai entrants from Myanmar led the 10 imported coronavirus cases. The others were three Thais who illegally crossed the border from Cambodia and an Indian national who flew in from the United Arab Emirates.
CCSA spokesman Taweesilp Visanuyothin renewed a warning about the severity of the crisis, reflected in the increasing number of patients in hospitals and field hospitals.
The number of patients has continued to rise since the third outbreak in April. The country had 122,907 inpatients, according to figures reported on Monday -- almost 20% more than the 103,056 reported on Thursday.
