Schools, beaches and public transport in much of the southern part of the state were shut before Eta made landfall late on Sunday in Lower Matecumbe Key in the Florida Keys.
Eta has already wreaked devastation in parts of Central America.
It passed through Cuba before making landfall in Florida.
The National Hurricane Center warned in the early hours of Monday that Eta would bring "strong winds, heavy rains and dangerous storm surge" over parts of South Florida and Florida Keys.
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Tropical storm Eta has reached Florida and the Florida Keys, a string of tropical islands stretching between the Atlantic Ocean and the Gulf of Mexico, the US National Hurricane Centre (NHC) said.
ReplyDelete"Tropical Storm #Eta has made landfall on Lower Matecumbe Key Florida at 11pm EST [04:00 GMT on Monday]", NHC said on Twitter.
The maximum sustained winds were 65 miles per hour and the storm is currently moving northwest at 13.6 miles per hour.
On Sunday, Eta reached Cuba and hit southern regions of the central part of the country's coast.