"Although there are several hurdles still to climb, including a skeptical U.S. Congress, the deal has already seen an initial impact in markets," said Simon Smith, chief economist at FxPro Financial Services in London.
On Sunday, diplomats made history when Iran and six world powers reached an agreement over the country's nuclear program.
The deal brokered between the U.S., U.K., France, Russia, China and Germany curtails Iran's ability to develop a nuclear weapon.
Iran has been hard hit in recent years as various sanctions have hurt the oil-rich economy and led to staggering inflation levels.
Last week, the Dow hit a record high and the S&P 500 closed above 1,800 for the first time.
Trading volume is expected to be low during a holiday-shortened week. U.S. markets will be closed Thursday for Thanksgiving and will shut at 1 p.m. ET on Friday.
In company news, Apple bought the Israeli company PrimeSense. Apple's (Fortune 500) stock slipped slightly in premarket trading. ,
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|Overnight Avg Rate||Latest||Change||Last Week|
|30 yr fixed||4.37%||4.31%|
|15 yr fixed||3.40%||3.32%|
|30 yr refi||4.38%||4.31%|
|15 yr refi||3.39%||3.32%|
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