(Reuters) - Futures for Canada's main stock index slipped on Tuesday as weakness in copper and oil prices weighed down on the underlying stocks, while investors awaited the Bank of Canada's interest rate decision on June 5.

June futures on the S&P/TSX index were down 0.8% at 6:41 a.m. ET (10:41 GMT).

The materials sector is expected be grab the spotlight, with copper prices dipping below the key mark of $10,000 a metric ton for the first time in three weeks, as consolidation continued due to lacklustre demand from top consumer China. [MET/L]

Energy shares, which account for 20% of the Toronto market's weighting, continued to be in focus as oil prices fell more than $1 on Tuesday, extending losses from a four-month low in the previous session. [O/R]

Investors remained on edge ahead of the Canada's monetary policy decision due on Wednesday, where the country's central bank is widely expected to cut interest rates to 4.75%,a Reuters poll of economists showed.

The yield on the Canadian 10-year benchmark bond was down at 3.482%.

Among other data, investors will also keep a close eye on the job openings data, due at 1000 ET, to assess the strength of the American labor market.

Across the border, the U.S. stock index futures also fell as doubts over the strength of the economy took hold and investors awaited more data later in the week to gauge how much growth has slowed. [.N]

The Toronto Stock Exchange's S&P/TSX composite index had ended lower on Monday as a drop in oil prices weighed down on energy stocks and offset gains in the high-dividend paying utilities stocks. [.TO]

In company news, Fairfax India Holdings Corp on Monday said Prem Watsa, popularly known as "Canada's Warren Buffett", will step down as the investment firm's chairman.

COMMODITIES AT 6:41 a.m. ET

Gold futures: $2,340.9; -0.7% [GOL/]

US crude: $72.57; -2.2% [O/R]

Brent crude: $76.86; -1.9% [O/R]

($1= C$1.3693)

(Reporting by Shubham Batra in Bengaluru; Editing by Shreya Biswas)