Early autumn · Weather & things to do
Key West in September
The year's rain peaks now, with about 7.0 in (177 mm) falling in Key West, alongside highs near 85°F (29°C) and lows of 83°F (29°C).
With a comfort score of 58/100 (12th of 12), it's one of the toughest months, held back mainly by rain.
- Avg high
- 85°F (29°C)
- Avg low
- 83°F (29°C)
- Rain
- 7.0 in (177 mm)
- Humidity
- 77%
- Cloud cover
- 62%
- Daylight
- ~12 h 08 min
- Comfort score
- 58/100 · Fair
What September feels like
Days are warm, averaging 85°F (29°C).
Even at night it stays warm, around 83°F (29°C).
With 77% average humidity, it feels muggy.
Expect regular rain: about 7.0 in (177 mm) falls in the month.
Plan around September
September is one of the lower-scoring months here; the best are November – April.
- Inside the wettest three-month stretch, July – September.
- Comfort slips from 61/100 in August to 58/100.
- Our Miami Beach Getaway route recommends Nov – Apr, so September falls outside its suggested window.
- Our Florida Keys Adventure route recommends Dec – May, so September falls outside its suggested window.
What to pack for September
- Light, breathable clothes85°F afternoons
- Sunscreen, sunglasses and a hatstrong sun this month
- Quick-dry fabrics77% average humidity
- Rain jacket and waterproof shoes7.0 in of rain on average
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Key West in September
Wet days call for a roof: these picks favor sit-down and indoor stops, plus a few for drier spells.
Sloppy Joe's Bar
Hemingway-era Duval Street bar with live music from noon to late.
Kermit's Key West Key Lime Shoppe
Key lime pie on a stick (chocolate-dipped, frozen) and key lime goods.
Why now An indoor-leaning stop for a month with 7.0 in of rain.
Captain Tony's Saloon
The original Sloppy Joe's location (1930s), with a tree growing through the roof and live music.
Why now A sit-down stop to wait out showers in a month with 7.0 in of rain.
Ernest Hemingway Home and Museum
Hemingway's 1930s home with guided tours and dozens of six-toed cats.
Why now A good rainy-day backup in September.
El Siboney
Cash-friendly Cuban restaurant serving roast pork and plantains in large portions.
Why now Easy to slot in when September's rain moves in.
Fort Zachary Taylor Historic State Park
Civil War fort with the best swimming beach in town and shade under pine trees.
Nearby in September
- Bahia Honda & the Lower Keys in September~33 mi · highs 85°F, 6.6 in rain · similar daytime temperatures, about as wet
- Everglades in September~75 mi · highs 85°F, 8.0 in rain · similar daytime temperatures, wetter
- Key Largo in September~91 mi · highs 85°F, 7.8 in rain · similar daytime temperatures, wetter
- Miami in September~130 mi · highs 85°F, 7.5 in rain · similar daytime temperatures, about as wet
These averages also cover Old Town & Duval Street.
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Key West in September: quick answers
Is September a good time to visit Key West?
It's one of the tougher months here, scoring 58/100, held back mainly by rain. The best months are November – April. Expect highs of 85°F (29°C) and 7.0 in (177 mm) of rain. Our Miami Beach Getaway route recommends Nov – Apr, so September is outside its suggested window.
How hot is Key West in September?
Average highs are 85°F (29°C) and average lows 83°F (29°C), making it the 3rd-warmest month by daytime highs.
Does it rain a lot in Key West in September?
Yes: about 7.0 in (177 mm) of rain falls across September on average, the wettest month of the year. The annual total is about 41.5 in (1054 mm).
What should I pack for Key West in September?
Bring light, breathable clothes (85°F afternoons), sunscreen, sunglasses and a hat (strong sun this month), quick-dry fabrics (77% average humidity), rain jacket and waterproof shoes (7.0 in of rain on average) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Key West
Planning Key West in September?
Share this September plan with your group, poll everyone on dates and keep the packing list in one place.