There were 14,555 new Covid-19 cases and 177 more fatalities recorded during the previous 24 hours, the Public Health Ministry reported on Friday morning.
There were 13,765 cases in the general population and 790 among prison inmates.
On Thursday, 13,691 Covid-19 patients were discharged from hospitals after recovering from the coronavirus.
This compared with 13,897 new Covid cases and 188 more deaths on Wednesday, reported by authorities on Thursday.
Since April 1, when the third wave of Covid-19 began, Thailand has treated 1,419,929 Covid-19 patients, 1,276,821 of whom have recovered to date.
Since the pandemic started early last year, there have been 1,448,792 Covid-19 cases, with 1,304,466 complete recoveries so far.
The death toll stood at 15,030 during the third wave and 15,124 since the beginning of the pandemic.
The kingdom’s 24-hour high of Covid-19 fatalities was 312 recorded on Aug 18. The highest number of cases was 23,418 on Aug 13.
The Centre for Covid-19 Situation Administration (CCSA) said on Friday afternoon that Greater Bangkok accounted for 77 of the 177 fatalities and the rest were recorded in 33 other provinces.
Bangkok also led new infections with 2,911 cases, followed by 1,110 in Samut Prakan and 935 in Chon Buri. There were nine cases from other countries — five from Cambodia, two from Myanmar and one each from the United States and France.
Locally infected cases had been on a downtrend since mid-August, Dr Apisamai Srirungson, a spokeswoman for CCSA, said. The number of new cases hovered between 12,000 and 15,000 daily in recent weeks.
"We hope to see the figures go lower," she said.
The main concern centred on two coming events that could reverse the trend, as they could draw a large number of attendants.
She referred to ceremonies held for retiring state officials and the Nine Emperor Gods Festival, an annual vegetarian festival and a major tourist drawcard, from Oct 4-13.
"Ceremonies can be held for officials who are retiring, but the host should not throw a party, if that's possible," Dr Apisamai said.
The vegetarian festival could encourage people to travel, and that could spread the virus. The main festival is in Phuket, with smaller celebrations normally nationwide.