Updated 3 Nov 2026 · recomputed nightly
Is September 2027 a good month to visit Boston?
Lively — the typical September day in Boston is busier than 60% of its year.
If you are coming for something that only happens in September, that is the trade. If not, February is quieter.
Calm · Lively · Busy · Packed rank a day against Boston's own year — not a headcount.
September 2027 is a shoulder month in Boston: warm and wet, around 23°C / 74°F with rain on about 10 days, Lively on 16 of 30 days — 14 days run Busy or Packed.
Mostly yes. The typical September day in Boston is Lively, and 14 of the 30 days in our window run Busy or Packed. Expect around 23 °C by day, with rain on about 10 days. Public holidays in Canada and United States add to it. Cruise ships call on 23 of the 30 days, 4 at once on Saturday 18 September. Late September is the month's quietest stretch in Boston — the typical day at 56%, against 67% in mid September. The crush is at Faneuil Hall and Quincy Market; the quiet is at the Esplanade and the Charles banks. The calmest day is Wednesday 1 September, the busiest Saturday 18 September.
In short, a solid middle-ground pick.
Among the 12 months we forecast for Boston, September ranks 5th for crowd pressure. Its heaviest day is Sat 18 Sep, busier than 100% of the year; its lightest is Wed 1 Sep at 50%.
Preparing pays off in a month like this: timed-entry tickets and pre-booked tours turn the queue time into sightseeing time. see the options →
Pack for wet first — rain on 10 of 30 days.
A folding one lives in the day bag and weighs nothing.
See umbrellas →
Wet stone is the thing to plan around in a month this wet.
See walking shoes →
How busy is Boston in September?
The busiest days are the 4th, 6th, 18th and 30th, and 10 more. Away from those, most days sit Lively. The calmest stretch is the 21st–25th.
Ships call on 23 of 30 days, a typical call day carrying at least 2,726 guests between them — real, but a secondary part of the crowd here; the season moves the needle more.
The month is not one thing: its lightest day sits at 50% of the year and its heaviest at 100%, so where you land inside it matters. All four Mondays run Busy or Packed. Daylight runs about 12 hours.
Either side of it, August picks up and October picks up.
The calmest days include the 1st, 3rd and 10th — 7 days share that level, so there is room to choose.
Wed 01 Sep Lively busier than 50% of days here
Record Boston on Wed 1 Sep 2027 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-01 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Thu 02 Sep Busy busier than 76% of days here · ⚓1
- Celebrity Silhouette — guest capacity 2,902 07:00–18:00
Record Boston on Thu 2 Sep 2027 is forecast Busy. 1 cruise ship scheduled, at least 2,902 guests at double occupancy; ships in port 07:00–18:00. Nearest calmer day: Wed 1 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-02 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Fri 03 Sep Lively busier than 50% of days here
Record Boston on Fri 3 Sep 2027 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-03 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Sat 04 Sep Packed busier than 98% of days here · ⚓3
- Independence Of The Seas — guest capacity 3,836 08:00–18:00
- Silver Shadow — guest capacity 388 08:00–17:00
- Zuiderdam — guest capacity 1,970
Record Boston on Sat 4 Sep 2027 is forecast Packed. 3 cruise ships scheduled, at least 6,194 guests at double occupancy. Nearest calmer day: Fri 3 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-04 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Sun 05 Sep Lively busier than 53% of days here · ⚓1
- Oceania Vista — guest capacity 1,218 08:00–17:00
Record Boston on Sun 5 Sep 2027 is forecast Lively. 1 cruise ship scheduled, at least 1,218 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/boston-massachusetts/#d-2027-09-05 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Mon 06 Sep Packed busier than 94% of days here · ⚓1 · United States public holiday
- Regal Princess — guest capacity 3,560 07:00–15:00
Record Boston on Mon 6 Sep 2027 is forecast Packed. 1 cruise ship scheduled, at least 3,560 guests at double occupancy; ships in port 07:00–15:00. Why: United States public holiday; Canada public holiday. Nearest calmer day: Sun 5 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-06 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Tue 07 Sep Busy busier than 76% of days here · ⚓1
- Caribbean Princess — guest capacity 3,138 05:00–17:00
Record Boston on Tue 7 Sep 2027 is forecast Busy. 1 cruise ship scheduled, at least 3,138 guests at double occupancy; ships in port 05:00–17:00. Nearest calmer day: Wed 8 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-07 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Wed 08 Sep Lively busier than 52% of days here · ⚓1
- Azamara Quest — guest capacity 722 08:00–18:00
Record Boston on Wed 8 Sep 2027 is forecast Lively. 1 cruise ship scheduled, at least 722 guests at double occupancy; ships in port 08:00–18:00. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-08 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Thu 09 Sep Busy busier than 72% of days here · ⚓1
- Norwegian Pearl — guest capacity 2,394 08:00–20:00
Record Boston on Thu 9 Sep 2027 is forecast Busy. 1 cruise ship scheduled, at least 2,394 guests at double occupancy; ships in port 08:00–20:00. Nearest calmer day: Wed 8 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-09 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Fri 10 Sep Lively busier than 50% of days here
Record Boston on Fri 10 Sep 2027 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-10 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Sat 11 Sep Lively busier than 60% of days here · ⚓1
- Vision Of The Seas — guest capacity 2,036 08:00–18:00
Record Boston on Sat 11 Sep 2027 is forecast Lively. 1 cruise ship scheduled, at least 2,036 guests at double occupancy; ships in port 08:00–18:00. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-11 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Sun 12 Sep Lively busier than 52% of days here · ⚓1
- Azamara Quest — guest capacity 722 08:00–18:00
Record Boston on Sun 12 Sep 2027 is forecast Lively. 1 cruise ship scheduled, at least 722 guests at double occupancy; ships in port 08:00–18:00. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-12 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Mon 13 Sep Busy busier than 84% of days here · ⚓1
- Regal Princess — guest capacity 3,560 07:00–15:00
Record Boston on Mon 13 Sep 2027 is forecast Busy. 1 cruise ship scheduled, at least 3,560 guests at double occupancy; ships in port 07:00–15:00. Nearest calmer day: Sun 12 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-13 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Tue 14 Sep Lively busier than 50% of days here
Record Boston on Tue 14 Sep 2027 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-14 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Wed 15 Sep Lively busier than 50% of days here
Record Boston on Wed 15 Sep 2027 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-15 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Thu 16 Sep Lively busier than 51% of days here · ⚓1
- Star Pride — guest capacity 343 08:00–17:00
Record Boston on Thu 16 Sep 2027 is forecast Lively. 1 cruise ship scheduled, at least 343 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/boston-massachusetts/#d-2027-09-16 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Fri 17 Sep Packed busier than 94% of days here · ⚓2
- AIDAluna — guest capacity 2,050 09:00–22:00
- Mein Schiff 1 — guest capacity 2,534 08:00–22:00
Record Boston on Fri 17 Sep 2027 is forecast Packed. 2 cruise ships scheduled, at least 4,584 guests at double occupancy; ships in port 08:00–22:00. Nearest calmer day: Thu 16 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-17 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Sat 18 Sep Packed the busiest day in our forecast · ⚓4
- Independence Of The Seas — guest capacity 3,836 08:00–18:00
- Viking Mars — guest capacity 928
- Volendam — guest capacity 1,432
- Zuiderdam — guest capacity 1,970
Record Boston on Sat 18 Sep 2027 is forecast Packed, the busiest day of its forecast year. 4 cruise ships scheduled, at least 8,166 guests at double occupancy. Nearest calmer day: Sun 19 Sep (Busy). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-18 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Sun 19 Sep Busy busier than 74% of days here · ⚓1
- Queen Mary 2 — guest capacity 2,726
Record Boston on Sun 19 Sep 2027 is forecast Busy. 1 cruise ship scheduled, at least 2,726 guests at double occupancy. Nearest calmer day: Tue 21 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-19 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Mon 20 Sep Busy busier than 84% of days here · ⚓1
- Regal Princess — guest capacity 3,560 11:00–20:00
Record Boston on Mon 20 Sep 2027 is forecast Busy. 1 cruise ship scheduled, at least 3,560 guests at double occupancy; ships in port 11:00–20:00. Nearest calmer day: Tue 21 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-20 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Tue 21 Sep Lively busier than 50% of days here
Record Boston on Tue 21 Sep 2027 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-21 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Wed 22 Sep Lively busier than 51% of days here · ⚓2
- Explora IV — size unknown (uncounted)
- Silver Shadow — guest capacity 388 08:00–17:00
Record Boston on Wed 22 Sep 2027 is forecast Lively. 2 cruise ships scheduled, at least 388 guests at double occupancy, plus 1 of unknown size. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-22 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Thu 23 Sep Lively busier than 52% of days here · ⚓1
- Seven Seas Grandeur — guest capacity 754 08:00–17:00
Record Boston on Thu 23 Sep 2027 is forecast Lively. 1 cruise ship scheduled, at least 754 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/boston-massachusetts/#d-2027-09-23 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Fri 24 Sep Lively busier than 50% of days here
Record Boston on Fri 24 Sep 2027 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-24 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Sat 25 Sep Lively busier than 60% of days here · ⚓1
- Vision Of The Seas — guest capacity 2,036 08:00–18:00
Record Boston on Sat 25 Sep 2027 is forecast Lively. 1 cruise ship scheduled, at least 2,036 guests at double occupancy; ships in port 08:00–18:00. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-25 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Sun 26 Sep Busy busier than 72% of days here · ⚓1
- Norwegian Pearl — guest capacity 2,394 08:00–19:00
Record Boston on Sun 26 Sep 2027 is forecast Busy. 1 cruise ship scheduled, at least 2,394 guests at double occupancy; ships in port 08:00–19:00. Nearest calmer day: Sat 25 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-26 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Mon 27 Sep Packed busier than 92% of days here · ⚓2
- Regal Princess — guest capacity 3,560 11:00–20:00
- Silver Shadow — guest capacity 388 08:00–17:00
Record Boston on Mon 27 Sep 2027 is forecast Packed. 2 cruise ships scheduled, at least 3,948 guests at double occupancy; ships in port 08:00–20:00. Nearest calmer day: Sun 26 Sep (Busy). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-27 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Tue 28 Sep Busy busier than 76% of days here · ⚓1
- Caribbean Princess — guest capacity 3,138 07:00–16:00
Record Boston on Tue 28 Sep 2027 is forecast Busy. 1 cruise ship scheduled, at least 3,138 guests at double occupancy; ships in port 07:00–16:00. Nearest calmer day: Wed 29 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-28 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Wed 29 Sep Lively busier than 53% of days here · ⚓1
- Oceania Vista — guest capacity 1,218 08:00–17:00
Record Boston on Wed 29 Sep 2027 is forecast Lively. 1 cruise ship scheduled, at least 1,218 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/boston-massachusetts/#d-2027-09-29 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Thu 30 Sep Packed busier than 96% of days here · ⚓2 · Canada public holiday
- AIDAluna — guest capacity 2,050 09:00–14:00
- Norwegian Pearl — guest capacity 2,394 08:00–20:00
Record Boston on Thu 30 Sep 2027 is forecast Packed. 2 cruise ships scheduled, at least 4,444 guests at double occupancy; ships in port 08:00–20:00. Why: Canada public holiday. Nearest calmer day: Wed 29 Sep (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/boston-massachusetts/#d-2027-09-30 (Avoid-Crowds, as of 3 Nov 2026; recomputed nightly.)
Which week of September is quietest in Boston?
Late September is the month's quietest stretch in Boston — the typical day at 56%, against 67% in mid September.
Can't move the dates? How to avoid the worst crowds
- Need flexibility? The 21st–25th is the month's calmest stretch — the easiest window to move around in.
- On the busy days, the walk-up queues for the big sights are the biggest time-sink — a timed-entry ticket skips them, which is where a busy month is won or lost.
Travelling on a busy day?
Timed-entry and skip-the-line tickets turn queue time into sightseeing time — sort them before you fly.
September weather in Boston
Comfortably warm — around 23°C / 74°F, easy shirtsleeve weather, with rain on about 10 days, so keep a layer handy.
Worth booking the marquee sights ahead for the busy days, but you can keep the rest of the trip flexible.
More about Boston 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) · 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.
