Wall Street was up overnight on better-than-expected corporate earnings including from United Parcel Service and Pfizer, while the latest economic reports suggested the US Federal Reserve might hold off an interest rate hike longer than expected.
In late afternoon trading in New York, the Dow Jones Industrial Average gained 1.1 percent, the Standard & Poor's 500 Index climbed 1.2 percent, while the Nasdaq Composite Index rose 0.9 percent.
Gains in shares of Exxon Mobil and those of Chevron, up 4 percent and 3.8 percent respectively, led the gains in the Dow.
The Federal Open Market Committee began its two-day meeting, as separate reports showed an unexpected drop in consumer confidence and a lower-than-expected increase in home prices. All eyes are on fresh clues about the timing of a rate hike at the end of the Fed meeting on Wednesday.
"September is possible but the probability for a December rate hike is increasing," Terry Sandven, chief equity strategist at US Bank Wealth Management in Minneapolis, told Reuters. " I think the market has finally factored in that the pace of the increase is more important rather than the timing of it."