However, it was still producing "some wind gusts to near hurricane force."
As of 8 am, Irma was about 105 miles northwest of Tampa, with maximum sustained winds of 70 miles per hour.
Early reports of Irma's aftermath seemed to show that damage in Florida from the massive storm were not as bad as initially feared.
Television footage showed trees down and buildings with exterior damage, though people were able to make their way through muddy or lightly flooded streets.
The storm had carved a path of destruction through the Caribbean last week, where it was blamed for at least 27 deaths.
It slammed into the Florida Keys island chain as a powerful Category Four storm on Sunday. Irma was linked to three deaths in Florida.