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By Katy Barnato, CNBC

U.S. stock index futures rallied on Wednesday as global markets continued to recover from the Brexit vote swoon.

Dow futures rose 100 points, while S&P and Nasdaq futures gained 12 points and 30 points, respectively.

Both the pan-European STOXX 600 index and the U.K.'s FTSE 100 traded more than 2 percent higher on Wednesday, having rallied in the previous session. Sterling continued to gain against the U.S. dollar.

A British flag flutters in front of a window in London, Britain, June 24, 2016 after Britain voted to leave the European Union in the EU BREXIT referendum. REUTERS/Reinhard Krause

"Yesterday was a better day for markets, with some sense of calm restored for now at least. But this was perhaps not surprising given the violence of the moves in the previous two trading days. And it would fit with the pattern seen in previous crises," Grant Lewis, head of research at Daiwa Capital markets, said in a note on Wednesday.

U.S. data due on Wednesday include the latest personal income and spending data for May, plus the core PCE price index that is an important indicator for the U.S. Federal Reserve. The inflation measure is expected to show a slight increase of around 0.2 percent in May.

Major companies reporting quarterly earnings on Wednesday include Monsanto, General Mills and Acuity Brands.

On Wednesday, Goldman Sachs said that in the wake of Brexit, the U.S. financial sector would be at risk from contagion because of its high connectivity with the U.K. financial system.

"Financially at least, the U.S. and the U.K. are two of the most interconnected countries in the world," Goldman said in a report.

"However, the post-financial crisis central banking and regulatory regime should limit concerns over the banking sector," it later added.

See More From CNBC: Is the Market Underestimating Brexit's Impact?