The storm could weaken as it moves farther west to Cambodia and Thailand, the Meteorological Department said in its latest warning issued at 4pm on Saturday.
However, its course was changing slightly, making the exact locations of heaviest impact harder to predict.
The department and a flood monitoring panel under the Water and Flood Management Commission believe Gaemi could enter the Gulf of Thailand from the mainland on Monday and affect lower central and southern provinces.
Royol Chitradol, the chairman of the panel, said on Saturday that the slight change in the weather pattern indicated that Gaemi could regain strength over the water before it hits the lower central and southern provinces.
Earlier, the Meteorological Department had expected Gaemi to take a more northerly course across Cambodia and toward the lower Northeast of Thailand. The storm was approaching central Vietnam late Saturday.
Mr Royol did not rule out the possibility of more storms this year.
In the updated advisory, the provinces to be affected by the storm on Monday and Tuesday are Ratchaburi, Prachuap Khiri Khan, Chumphon, Ranong, and Phang-nga. Other provinces include Uthai Thani, Nakhon Sawan, Kanchanaburi and Suphan Buri, the weather agency said.
It also forecast heavy rain and strong winds over the weekend in Amnat Charoen, Ubon Ratchathani, Si Sa Ket, Surin, Buri Ram and Nakhon Ratchasima provinces in the northeastern region.
As well, it said, the two eastern provinces of Sa Kaeo and Prachin Buri would be affected. The central and lower northern parts of the country would be affected later.
The department has predicted precipitation in 60% of Bangkok area from late Saturday through Monday with heavy rainfall in some parts of the capital.
The Gulf of Thailand and Andaman Sea would also see waves up to three meters high from Sunday to Tuesday, it added.
More provinces will be affected by Gaemi which will cause "torrential rain with heavy to very heavy rain in some areas", it said.
Gaemi was moving at 25 kilometres per hour with wind speeds up to 80km/h as of 4pm Saturday, according to the department.
Prime Minister Yingluck Shinawatra declared on Friday that she would take personal command of flood relief operations and coordinate with governors of flood-prone provinces around the clock to deal with Gaemi.
The Bangkok Metropolitan Administration (BMA) is preparing to cope with heavy rain expected over the weekend and is receiving water from nearby provinces to ease their flooding.
BMA drainage director Sanya Cheenimit said City Hall was opening its sluice gates to receive water from outside but only on a limited basis in order to protect the capital.
Surakiat Limcharoen, the BMA's director for disaster relief, said heavy rain might cause floods in Bangkok for four to five hours.
Somsak Khaosuwan, director of the National Disaster Warning Centre, said 80 water-propelling boats were ready in Bangkok and military compounds would be used as water-retention areas to prevent flooding on roads.
Science and Technology Minister Plodprasop Suraswadi said that in Thailand, Gaemi would be weak and it would produce less rain than expected.
His advice on how to prepare for possible problems this weekend: "Don't leave home."
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