Early autumn · Weather & things to do
Key Largo in September
The year's rain peaks now, with about 7.8 in (197 mm) falling in Key Largo, alongside highs near 85°F (30°C) and lows of 82°F (28°C).
With a comfort score of 54/100 (12th of 12), it's one of the toughest months, held back mainly by rain.
- Avg high
- 85°F (30°C)
- Avg low
- 82°F (28°C)
- Rain
- 7.8 in (197 mm)
- Humidity
- 77%
- Cloud cover
- 65%
- Daylight
- ~12 h 08 min
- Comfort score
- 54/100 · Fair
What September feels like
Highs settle around 85°F (30°C), warm enough for short sleeves.
Nights stay warm too, with lows averaging 82°F (28°C).
Humidity averages 77%, so the air feels sticky and the heat feels stronger than the thermometer says.
Rain is a real factor, with about 7.8 in (197 mm) across 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 holds steady from August (56 → 54/100).
- 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 hathigh UV on clear days
- Quick-dry fabrics77% average humidity
- Rain jacket and waterproof shoes7.8 in of rain on average
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Key Largo in September
Wet days call for a roof: these picks favor sit-down and indoor stops, plus a few for drier spells.
Snappers Oceanfront Restaurant & Bar
Ocean-side tiki bar and seafood restaurant on a canal.
Why now A sit-down stop to wait out showers in a month with 7.8 in of rain.
Sundowners
Bayside restaurant since 1985 with west-facing tables over Florida Bay.
Why now Easy to slot in when September's rain moves in.
John Pennekamp Coral Reef State Park
First undersea park in the U.S., with snorkel and glass-bottom boat trips to the reef.
Why now Our curated notes say it's best morning, Apr–Sep.
African Queen
The steamboat from the 1951 film, running short canal cruises.
Key Largo Fisheries Backyard Café
Working fish house serving lobster rolls and fresh hogfish at waterside tables.
Why now Keeps part of the day dry on wetter September days.
Nearby in September
- Everglades in September~31 mi · highs 85°F, 8.0 in rain · similar daytime temperatures, about as wet
- Miami in September~49 mi · highs 85°F, 7.5 in rain · similar daytime temperatures, about as wet
- Bahia Honda & the Lower Keys in September~59 mi · highs 85°F, 6.6 in rain · similar daytime temperatures, drier
- Key West in September~91 mi · highs 85°F, 7.0 in rain · similar daytime temperatures, drier
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 Largo in September: quick answers
Is September a good time to visit Key Largo?
It's one of the tougher months here, scoring 54/100, held back mainly by rain. The best months are November – April. Expect highs of 85°F (30°C) and 7.8 in (197 mm) of rain. Our Florida Keys Adventure route recommends Dec – May, so September is outside its suggested window.
How hot is Key Largo in September?
Average highs are 85°F (30°C) and average lows 82°F (28°C), making it the 3rd-warmest month by daytime highs.
Does it rain a lot in Key Largo in September?
Yes: about 7.8 in (197 mm) of rain falls across September on average, the wettest month of the year. The annual total is about 48.7 in (1237 mm).
What should I pack for Key Largo in September?
Bring light, breathable clothes (85°F afternoons), sunscreen, sunglasses and a hat (high UV on clear days), quick-dry fabrics (77% average humidity), rain jacket and waterproof shoes (7.8 in of rain on average) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Key Largo
Planning Key Largo in September?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.