Humidity in Miami, Florida Today

Miami has a tropical monsoon climate — the only major US city that does — and that sets it apart from everywhere else on this site. Wedged between the Atlantic, Biscayne Bay and the Everglades, the city is surrounded by warm water on nearly every side, so the air stays loaded with moisture and dew points sit in the 70s°F for much of the year. There is no cold, dry continental air mass that reliably reaches this far south, so Miami never truly dries out the way cities even a few hundred miles north do.

The year splits cleanly into two seasons defined by moisture rather than temperature. The wet season, roughly May through October, is driven by the sea breeze and daily convective thunderstorms: warm mornings build toward towering afternoon storms as sea-breeze boundaries collide over the peninsula, then clear to a steamy evening. The dry season, November through April, is Miami at its most pleasant — humidity eases, the storms fade, and comfortable trade winds take over.

Because so much of the moisture is home-grown from the surrounding water and wetlands, Miami's humidity is remarkably persistent hour to hour. Overnight readings climb toward saturation, mornings bring dew and haze, and even the afternoon dip is modest by mainland standards. Layer in the June-through-November hurricane season, when tropical systems can wrap deep moisture over South Florida for days, and it is easy to see why Miami's air feels tropical in a way no other big American city's does.