The peso, which has been hit by the rise of Republican candidate Donald Trump and his policies that are seen hurting Mexico's economy, rose as much 2.2 percent, but later pared gains to trade up 1.6 percent at 18.708 pesos per dollar.
In a letter to Congress on Sunday announcing the end of a review of newly discovered emails related to Clinton's private server, FBI Director James Comey said the agency had not changed its conclusions from July that no criminal charges were warranted against the presidential contender.