Search flights, hotels & activities for Key West
Compare flights, hotels, cars, and activities in one place.
500+airlines & travel sites compared
21,000+routes tracked
€0booking fees from us
Freeprice drop alerts
Things to Do in Key West in September
Real historical weather for Key West in September: average highs of 30°C and lows of 27°C, with around 172mm of rain (averaged over the last 3 years). Key West is in United States.
30°C
Average high
27°C
Average low
172mm
Typical rainfall
Real things to do in Key West in September
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Shark and Wildlife Viewing Adventure in Key West
★ 5.0(3,343 reviews)· 2 hrs
From €88
Half-Day Trip from Key West with Kayaking, Snorkeling & Sunset
★ 4.9(1,806 reviews)· 4h 30m
From €112
Key West Full-Day Ocean Adventure: Kayak, Snorkel, Sail
★ 4.9(833 reviews)· 6h 30m
From €142
Southernmost Food & Cultural Walking Tour by Key West Food Tours
★ 4.9(1,915 reviews)· 3 hrs
From €81
Key West Dolphin Watch and Snorkel Tour - Eco Adventure
★ 4.7(1,212 reviews)· 3 hrs
From €65
Key West Reef Morning Snorkeling with Breakfast and Mimosas
★ 4.5(705 reviews)· 3 hrs
From €45
Key West Hop-On Hop-Off Trolley Tour
★ 4.5(1,735 reviews)· 1h 30m
From €50
Key West Afternoon Snorkel Sail with Unlimited Cocktails!
★ 4.4(1,610 reviews)· 3 hrs
From €53
Key West Dolphin and Snorkel Experience
★ 4.4(364 reviews)· 3 hrs
From €62
Miami to Key West Day Trip with Activity Options
★ 4.3(1,708 reviews)· 15 hrs
From €35
Real listings from Viator, including live ratings and prices — clicking through takes you to book directly.
Plan the rest of your trip
Continue planning your trip to Key West
Same destination, real availability — no need to search again.
FAQs — Key West in September
Based on real historical data (averaged over the last 3 years), expect highs around 30°C and lows around 27°C, with roughly 172mm of rain.