BEIJING, Dec 29 (Reuters) - China will adjust the weightings of two key yuan index baskets in 2024, the country's foreign exchange trade platform said on Friday, to better reflect trade patterns.

From Jan. 1, the China Foreign Exchange Trade System (CFETS), which is overseen by the central bank, will lower the U.S. dollar's weighting in the CFETS currency basket to 19.46% from 19.83% and cut the euro's weighting to 18.08% from 18.21%, according to an online statement.

The adjustments will "further enhance the representativeness of the yuan currency basket index," CFETS said in the statement.

China lowered weightings for the dollar and euro in the CFETS basket in 2023.

Such adjustments are unlikely to create sharp volatility in yuan trades, but they may affect the setting of the yuan's official daily midpoint fixing, which caps the spot trade in a narrow range of 2% around that level, market watchers said.

The CFETS index finished the year at 97.42, down 1.27% this year, according to Reuters calculation based on official data. During the same period, the onshore yuan has lost 2.7% to the dollar and looks set for the second straight yearly drop.

China has adjusted the CFETS basket multiple times since it introduced the trade-weighted yuan index in December 2015 to better reflect external trade conditions.

In addition, the CFETS said it would also tweak BIS currency basket RMB index after the Bank for International Settlements (BIS) adjusted currency weightings at the start of this year.

In detail, CFETS will remove the Croatian kuna while adding the Bosnian marka, Moroccan dirham, North Macedonian denar, and Serbian dinar to the basket. (Reporting by Beijing Newsroom; Editing by Alex Richardson and Mark Potter)