On Tuesday, Mrs. Clinton is expected to visit a health care center in Miami to raise awareness about the threat posed by the Zika virus.

Mrs. Clinton leads Mr. Trump in a head-to-head matchup by six percentage points in Florida, 48 percent to 42 percent, according to a poll released last week by Suffolk University in Boston. In a four-way race that includes Gary Johnson, a Libertarian, and Jill Stein, the Green Party nominee, Mrs. Clinton’s lead narrows to four points, according to the survey.

Mrs. Clinton’s advantage in the state owes largely to her strength with Hispanic voters, many of whom have shunned Mr. Trump over his hard-line positions on immigration.

A spokeswoman for Mr. Trump’s campaign did not respond to an inquiry about the candidate’s organizational footprint in Florida. Mr. Trump has spent considerable time in the state — campaigning and otherwise — holding court at his Mar-a-Lago estate in Palm Beach and calling Florida his second home.

But Mrs. Clinton has taken care to shower the state with attention as well. When she announced Senator Tim Kaine of Virginia as her running mate last month, the two made their debut in Miami, with Mr. Kaine often slipping into Spanish.