Stocks: 3 things to know before the open

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Click chart for in-depth premarket data.

Welcome back from the long weekend!

There are four trading days this week but there are only three things you need to know before the week begins.

Here they are:

1. Ready for a rally: U.S. stock futures are set to shoot higher once the trading day begins in New York.

The Dow Jones industrial average, S&P 500 and Nasdaq are all poised to open about 1.8% higher.

Stocks like Apple (AAPL), PayPal (PYPL) and Freeport-McMoRan (FCX) are leading the way with premarket gains of between 2% and 4%.

The positive sentiment comes as Chinese stocks rebound despite disappointing trade data. Most global stock markets are climbing Tuesday.

But this follows several tumultuous weeks in the markets which saw wild fluctuations for stocks and oil prices.

The CNNMoney Fear & Greed Index is still indicating there's extreme fear in the markets as traders worry about the health of the global economy and the timing of a rise in U.S. interest rates.

Related: Chinese markets post gains even after trade data disappoints

2. Eyes on oil: Crude oil futures are dipping by about 2.5% to trade around $44.90 per barrel Tuesday.

The price of crude dropped below $39 per barrel in late August and then quickly shot up to trade near $50 per barrel on the final day of the month.

Related: CNNMoney's Tech30

3. Weekly market recap: The Dow Jones industrial average and S&P 500 both experienced wild trading jumps and bumps over the previous week. They closed out the five days with a total loss of 2.6%. The Nasdaq dropped by 1.9% over the same period.

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