Updated 16 Sep 2026 · recomputed nightly
Is September 2026 a good month to visit Key West?
Calm — September is Key West's quietest month: the typical day is calmer than 96% of its year.
The weather is the trade-off here, not the crowds.
Calm · Lively · Busy · Packed rank a day against Key West's own year — not a headcount.
September is Key West with the crowds gone — Calm on 11 of 15 days and never busier than Lively, hot and wet, around 29°C / 85°F with rain on about 19 days. (Our forecast covers 16–30 September — the rest of September is beyond the current window.)
Yes, if the weather does not put you off. September in Key West is Calm on the typical day, and not one of the 15 days in our window is crowded enough to call Busy. Expect around 29 °C by day, with rain on about 19 days. Cruise ships call on 6 of the 15 days. The crush is at Mallory Square at sunset; the quiet is at the old town's back lanes. The calmest day is Wednesday 16 September, the busiest Monday 28 September.
In short, quiet and wide open, if the weather doesn't put you off.
Of the 12 months we forecast for Key West, September is the quietest. Its heaviest day is Mon 28 Sep, busier than 56% of the year; its lightest is Wed 16 Sep at 4%.
You won't need skip-the-line tickets here — that's rather the point. A month like this is the one for the longer visit — the guided walk, the food tour, the day out of town, with room and time to enjoy them. see what's on →
Pack for wet first — rain on 19 of 30 days.
A folding one lives in the day bag and weighs nothing.
See umbrellas →
Refilling costs nothing and saves the walk to find a shop.
See water bottles →
How busy is Key West in September?
It's quiet right through September — no crowded stretch to plan around.
Cruise ships are in port on 6 of 15 days; the heaviest is Mon 28 Sep, 1 ship in at once. Those mornings fill the squares first — start early, or save them for indoors.
The month is not one thing: its lightest day sits at 4% of the year and its heaviest at 56%, so where you land inside it matters. Daylight runs about 12 hours.
Either side of it, October picks up.
Any day works. There is no need to plan your dates around the crowds.
Wed 16 Sep Calm busier than 4% of days here
Record Key West on Wed 16 Sep 2026 is forecast Calm. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-16 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Thu 17 Sep Calm busier than 4% of days here
Record Key West on Thu 17 Sep 2026 is forecast Calm. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-17 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Fri 18 Sep Calm busier than 4% of days here
Record Key West on Fri 18 Sep 2026 is forecast Calm. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-18 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sat 19 Sep Calm busier than 4% of days here
Record Key West on Sat 19 Sep 2026 is forecast Calm. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-19 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sun 20 Sep Calm busier than 4% of days here
Record Key West on Sun 20 Sep 2026 is forecast Calm. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-20 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Mon 21 Sep Calm busier than 4% of days here
Record Key West on Mon 21 Sep 2026 is forecast Calm. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-21 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Tue 22 Sep Calm busier than 4% of days here
Record Key West on Tue 22 Sep 2026 is forecast Calm. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-22 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Wed 23 Sep Calm busier than 26% of days here · ⚓1
- Margaritaville At Sea Paradise — guest capacity 1,308 07:00–16:00
Record Key West on Wed 23 Sep 2026 is forecast Calm. 1 cruise ship scheduled, at least 1,308 guests at double occupancy; ships in port 07:00–16:00. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-23 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Thu 24 Sep Calm busier than 4% of days here
Record Key West on Thu 24 Sep 2026 is forecast Calm. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-24 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Fri 25 Sep Lively busier than 43% of days here · ⚓1
- Resilient Lady — guest capacity 2,770 08:00–17:00
Record Key West on Fri 25 Sep 2026 is forecast Lively. 1 cruise ship scheduled, at least 2,770 guests at double occupancy; ships in port 08:00–17:00. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-25 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sat 26 Sep Calm busier than 4% of days here
Record Key West on Sat 26 Sep 2026 is forecast Calm. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-26 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sun 27 Sep Lively busier than 40% of days here · ⚓1
- Margaritaville At Sea Islander — guest capacity 2,210 13:00–19:00
Record Key West on Sun 27 Sep 2026 is forecast Lively. 1 cruise ship scheduled, at least 2,210 guests at double occupancy; ships in port 13:00–19:00. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-27 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Mon 28 Sep Lively busier than 56% of days here · ⚓1
- Carnival Dream — guest capacity 3,646 10:00–18:00
Record Key West on Mon 28 Sep 2026 is forecast Lively. 1 cruise ship scheduled, at least 3,646 guests at double occupancy; ships in port 10:00–18:00. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-28 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Tue 29 Sep Lively busier than 45% of days here · ⚓1
- Carnival Liberty — guest capacity 2,978 08:00–16:00
Record Key West on Tue 29 Sep 2026 is forecast Lively. 1 cruise ship scheduled, at least 2,978 guests at double occupancy; ships in port 08:00–16:00. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-29 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Wed 30 Sep Calm busier than 26% of days here · ⚓1
- Margaritaville At Sea Paradise — guest capacity 1,308 07:00–16:00
Record Key West on Wed 30 Sep 2026 is forecast Calm. 1 cruise ship scheduled, at least 1,308 guests at double occupancy; ships in port 07:00–16:00. This quiet day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/key-west-florida/#d-2026-09-30 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
The upside of a quiet September
- Walk straight into the sights that sell out in high season — no timed ticket, no queue.
- Keep the days loose — decide over breakfast, not weeks ahead.
- Photograph the landmarks empty — the shot everyone else queues for.
No queues to skip, and nothing to book ahead — that's the whole point.
September weather in Key West
Real heat — around 29°C / 85°F by day, so pace the afternoons and carry water, with rain on about 19 days, so keep a layer handy.
This is the value month: no need to book far ahead, and the freedom to change plans on the day is part of what you're getting.
More about Key West in September
Based on: United States' public holidays · the official airport-arrivals pattern (BTS T-100, measured 2023–2025; airport-arrivals proxy for visitor volume, biased low for drive-in visitors) · five years of weather records (2019–2023) · confirmed event dates · the published cruise schedule
Every figure is recomputed nightly from real cruise schedules, public and school holidays, and long-run climate normals. Gaps are shown, not filled.
