How warm is Florida Keys in September?

Typical highs are about 86°F and the sea is about 88°F. That is warm enough for long swims without a wetsuit.

Is September hurricane season in Florida Keys?

September falls in the tropical storm season; the typical risk on a given day is high. It peaks in September. Travel insurance and flexible bookings help.

How crowded is Florida Keys in September?

Typically moderate, around Labor Day weekend and Mexican Independence Day. The quietest months are usually September and October.

Florida Keys in September

September is one of the weakest months for a beach trip to Florida Keys: a typical day grades B, the 12th best of the 12 months. Expect highs near 86°F, water around 88°F and about a 71% chance of rain on a given day. Beaches are typically moderate (Labor Day weekend and Mexican Independence Day). It is hurricane season, with high storm risk.

Typical dayB12th of 12 months

Highs / water86°FSea 88°F

Rain chance71%on a given day

Waves2 fttypical

CrowdsModerateLabor Day weekend

Storm riskHighhurricane season

Florida Keys month by month

Typical grade and high for each month. Higher is better: A+ to F.

August: A- · September: B · October: A-. The best months are usually April, May and November, and the weakest are January and September.

Best beaches in Florida Keys in September

Resorts with the best typical September, and their grades for the next few days.

Beach	Typical Sep	This week
Hawks Cay Resort	B	SatA-SunA-MonA-TueAWedA
Parmer's Resort	B	SatA-SunA-MonA-TueA-WedA-
Pier House Resort & Spa	B	SatA-SunA-MonATueA-WedA-
Baker's Cay Resort Key Largo	B	SatA-SunA-MonATueAWedA-
Playa Largo Resort & Spa	B	SatA-SunA-MonATueAWedA-
Islander Resort	B	SatB+SunA-MonA-TueA-WedA-
Cheeca Lodge & Spa	B	SatB+SunA-MonA-TueA-WedA-
Casa Morada	B	SatA-SunA-MonA-TueAWedA-

Grades for the next few days from Veabird's beach forecast, updated Oct 3, 18:00 UTC. Higher is better: A+ to F.

Better beach options in September

Elsewhere in Florida & the Gulf Coast, South Padre & the Coastal Bend (B+) usually grades higher in September. Further afield: Maui (A), Oʻahu (A) and Kauaʻi (A). Every destination in September.

Questions

Is September a good time to visit Florida Keys?: September is one of the weakest months for a beach trip to Florida Keys: a typical day grades B, the 12th best of the 12 months. Expect highs near 86°F, water around 88°F and about a 71% chance of rain on a given day. Beaches are typically moderate (Labor Day weekend and Mexican Independence Day). It is hurricane season, with high storm risk.
How warm is Florida Keys in September?: Typical highs are about 86°F and the sea is about 88°F. That is warm enough for long swims without a wetsuit.
Is September hurricane season in Florida Keys?: September falls in the tropical storm season; the typical risk on a given day is high. It peaks in September. Travel insurance and flexible bookings help.
How crowded is Florida Keys in September?: Typically moderate, around Labor Day weekend and Mexican Independence Day. The quietest months are usually September and October.

Plan it

Florida Keys: this week's forecast, beach by beach
Sargassum Report: this week, updated every Monday
Compare dates and beaches on the map

Typical-month numbers from Veabird's year-ahead outlook for the 17 resorts here (median resort): 6 years of ERA5 climate normals, the seasonal pattern of the Atlantic sargassum belt, holiday crowd calendars and historical storm tracks. Any given year can differ; check the 16-day forecast before you go.