Asian stock markets were mostly lower on Monday following weak Chinese data while overall trading volumes were light with Japan closed for a holiday.
Over the weekend, China released a raft of data that raised concerns about a weakening economy. August industrial output rose 6.9 percent on year, its slowest pace since 2008, while fixed-asset investment and retail sales both missed forecasts.
Read MoreIs fresh China stimulus a done deal?
Geopolitics also weighed on sentiment with fighting reported in eastern Ukraine on Saturday in breach of an eight-day ceasefire. Meanwhile, Australia became the first country to join the U.S. coalition fighting Islamic State militants and U.K. Prime Minister David Cameron said he's looking into increasing military participation following the beheading of a British hostage.
Investors were also looking ahead to Thursday's independence vote in Scotland and the Federal Reserve's policy decision on Wednesday.