Markets in the Asia-Pacific region opened lower today, despite a boost from optimism about the Federal Reserve's rate cut last week.

• The Reserve Bank of Australia's two-day policy meeting begins on Monday, with central bankers set to make a crucial rate decision on Tuesday.
• The August consumer prices index in Singapore is predicted to increase by 2.6% year on year, higher than the 2.5% increase recorded in July, according to a Reuters poll.

On Monday, Asia-Pacific markets began lower as investors evaluated the monetary policy decisions made by Japan and China on Friday, following the U.S. Federal Reserve's significant rate reduction, which boosted markets the previous week.

The National Bureau of Statistics reported that China's youth unemployment rate increased for two consecutive months, reaching its highest level this year, due to a slowing labor market and a weak economy.

On Friday, the People's Bank of China unexpectedly kept its key benchmark rate unchanged, despite increasing pressure to lower interest rates.

On Monday, the Reserve Bank of Australia will commence its two-day policy meeting, with central bankers set to determine the nation's monetary policy course on Tuesday.

The August consumer prices index for Singapore is predicted to be released, with core CPI estimated to have increased by 2.6% year on year, according to a Reuters poll. This is a slight rise from the 2.5% increase recorded in July. Additionally, the overall year-on-year CPI is expected to decrease to 2.15%, down from 2.40% in the previous month.

Markets in Japan were closed Monday for a public holiday.

Australia's S&P/ASX 200 fell 0.43% on open.

In South Korea, the Kospi decreased by 0.15%, but the Kosdaq remained unchanged.

The Hang Seng Index (HSI) closed at 18,199, which is lower than its last close of 18,258.57 in Hong Kong.

The closing price of the Futures for China CSI 300 was 3,183.8, which was below their previous close of 3,201.05.

Last week, the three major U.S. indexes finished their trading session with gains, with the S&P 500 reaching a new record high of 42,063.36, up 0.09%. The Dow Jones Industrial Average pulled back by 0.19%, ending at 5,702.55, while the Nasdaq Composite dropped 0.36% to finish at 17,948.32.

—CNBC's Hakyung Kim and Brian Evans contributed to this report.