[1/2] The Art Deco facade of the original Toronto Stock Exchange building is seen on Bay Street in Toronto, Ontario, Canada January 23, 2019.
ET (1524 GMT), the Toronto Stock Exchange's S&P/TSX composite index (.GSPTSE) was down 25.74 points, or 0.13%, at 19,921.33.
The materials sector (.GSPTTMT), which includes miners of precious and base metals, shed 0.7% as gold prices trickled lower.
The U.S. central bank is expected to deliver a half-percentage-point rate hike, along with The European Central Bank and the Bank of England, who are expected to raise their lending rates later in the week.
Including Monday's trading, the TSX is down 6% year-to-date, outperforming the U.S. benchmark S&P 500 index (.SPX), which has lost more than 17% this year.