Officials of United States and China described trade talks between the two nations in Washington as "productive" and "constructive".
However, on Friday a delegation of Chinese agriculture officials cancelled their trip to US farm states to return to China earlier than originally scheduled, leaving investors uncertain on the direction of the negotiations.
The uncertainty caused the yuan to weaken 0.3% to its lowest level in nearly two weeks.
Also impacting emerging currencies was the United States ordering additional troops to be deployed in the Gulf region to strengthen Saudi Arabia's air and missile defences, following the Sept. 14 attack on Saudi Arabian oil facilities.
Vishnu Varathan, senior economist at Mizuho Bank, said in a note on Monday the US move suggests that this week will see "defensive" trades in Asian currencies.
"EM Asia FX could be left on the back foot," he said.
The South Korean won declined the most among Asian currencies weakening 0.5% after data showed a slump in the country's exports for the first 20 days of September.
The customs agency of the country said exports to China plummeted 29.8% during Sept. 1-20, aggravating concerns of the impact of the prolonged and bruising Sino-US trade war.
With South Korea often seen as a bell-weather of global growth, concerns of a slowdown in global growth continued to worry investors.
The Indian rupee traded in a tight range as investors processed the government's decision on Friday to ease corporate tax rates.
India cut corporate tax rates in a surprise move designed to woo manufacturers, revive private investment and lift growth from a six-year low that has led to major job losses and fuelled discontent in the countryside.
A rally in the country's stock markets had helped the rupee firm as much as 0.9% on Friday to its strongest level since Aug. 9.
However, the move is also expected to cut revenue by 1.45 trillion rupees ($20.4 billion) in the current fiscal year.
Given the tax cuts shouldn't be inflationary, the Reserve Bank of India "might proceed with a modest (rate) cut" in October, DBS said in a note.