Igor, packing winds of 145 miles (230 kilometers) per hour is a category four hurricane, the second highest notch on the five-point Saffir-Simpson scale, and forecasters warned it was "getting stronger."
As the powerful storm churned through the Atlantic, the National Hurricane Center said tropical storm Karl had formed off the coast of Mexico's Yucatan peninsula.
Though still comparatively weak, the system threatened to dump more rain on Mexico, which is struggling with flooding in southeastern states including Veracruz and Oaxaca.
Almost one million people were affected by flooding this month alone which left 25 dead. The rains, which began in July, are set to worsen as the season continues to almost the end of the year.
More than one third of the Gulf Coast state of Veracruz has been hit by flooding which affected some 500,000 people, according to governor Fidel Herrera.
Igor is not expected to make landfall for days. Forecasters say the storm could reach Bermuda by Sunday, but caution it is too early to know if it will be a direct hit or how strong it will be five days from now.
"Exact impacts of Hurricane Igor at the end of the week are still difficult to gauge," the Bermuda Weather Service said.
"Much more detail on Igor will be covered in the next few days, as it likely becomes a potential threat to the island."
At 2100 GMT, Igor's eye was located some 655 miles (1,055 kilometers) east of the northern Leeward Islands and it was heading west-northwestward at eight miles (13 kilometers) per hour, US experts said.
Swells generated by the storm were due to begin affecting the archipelago later Tuesday before reaching Puerto Rico and the Virgin Islands late Tuesday and Wednesday.
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Igor stirs up Caribbean, takes aim at Bermuda - FOCUS Information Agency