Updated 16 Sep 2026 · recomputed nightly
Is May 2027 a good month to visit Kos?
Lively — the typical May day in Kos is busier than 63% of its year.
The weather is the trade-off here, not the crowds.
Calm · Lively · Busy · Packed rank a day against Kos's own year — not a headcount.
May 2027 is a shoulder month in Kos: warm and dry, around 23°C / 74°F, Lively on 21 of 31 days — 10 days run Busy or Packed.
Yes. The typical May day in Kos is Lively, and only 10 of the 31 days in our window run Busy or Packed. Expect around 23 °C by day, with rain on about 4 days. The crowd comes with the school holidays in Germany and the Netherlands. Cruise ships call on 1 of the 31 days. No week of May is meaningfully quieter — the typical day is Lively throughout; pick by day instead. The crush is at the Asklepion at coach hours; the quiet is at the coastal bike path. The calmest day is Tuesday 4 May, the busiest Saturday 1 May.
In short, a solid middle-ground pick.
Among the 12 months we forecast for Kos, May ranks 5th for crowd pressure. Its heaviest day is Sat 1 May, busier than 66% of the year; its lightest is Tue 4 May at 59%.
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 →
An easy month to pack for — rain on 4 of 31 days.
Paper keeps working when the phone is flat and the signal is gone.
See Kos guides →
The one thing you wear all day, every day of the trip.
See walking shoes →
How busy is Kos in May?
The busiest days are the 1st, 6th, 16th and 17th, and 6 more. Away from those, most days sit Lively. The calmest stretch is the 7th–15th.
Ships call on 1 of 31 days, a typical call day carrying at least 2,192 guests — real, but a secondary part of the crowd here; the season moves the needle more.
The month barely moves — every day lands between 59% and 66% of the year. Daylight runs about 14 hours.
Either side of it, April is far calmer and June picks up.
The calmest days are the 4th, 8th and 30th — aim for those if your dates can flex.
Sat 01 May Busy busier than 66% of days here · Greece public holiday
Record Kos on Sat 1 May 2027 is forecast Busy. Why: Greece public holiday; Germany public holiday; Netherlands school holidays. Nearest calmer day: Fri 30 Apr (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/kos/#d-2027-05-01 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sun 02 May Busy busier than 65% of days here · Greece public holiday
Record Kos on Sun 2 May 2027 is forecast Busy. Why: Greece public holiday; Netherlands school holidays. Nearest calmer day: Fri 30 Apr (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/kos/#d-2027-05-02 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Mon 03 May Busy busier than 65% of days here · Greece public holiday
Record Kos on Mon 3 May 2027 is forecast Busy. Why: Greece public holiday; UK public holiday. Nearest calmer day: Tue 4 May (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/kos/#d-2027-05-03 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Tue 04 May Lively busier than 59% of days here
Record Kos on Tue 4 May 2027 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-04 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Wed 05 May Busy busier than 65% of days here · Netherlands public holiday
Record Kos on Wed 5 May 2027 is forecast Busy. Why: Netherlands public holiday. Nearest calmer day: Tue 4 May (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/kos/#d-2027-05-05 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Thu 06 May Busy busier than 66% of days here · Germany public holiday
Record Kos on Thu 6 May 2027 is forecast Busy. Why: Germany public holiday; Netherlands public holiday. Nearest calmer day: Fri 7 May (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/kos/#d-2027-05-06 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Fri 07 May Lively busier than 64% of days here · Germany school holidays
Record Kos on Fri 7 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-07 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sat 08 May Lively busier than 60% of days here · Germany school holidays
Record Kos on Sat 8 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-08 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sun 09 May Lively busier than 60% of days here · Germany school holidays
Record Kos on Sun 9 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-09 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Mon 10 May Lively busier than 60% of days here · Germany school holidays
Record Kos on Mon 10 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-10 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Tue 11 May Lively busier than 60% of days here · Germany school holidays
Record Kos on Tue 11 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-11 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Wed 12 May Lively busier than 60% of days here · Germany school holidays
Record Kos on Wed 12 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-12 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Thu 13 May Lively busier than 60% of days here · Germany school holidays
Record Kos on Thu 13 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-13 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Fri 14 May Lively busier than 62% of days here · Germany school holidays
Record Kos on Fri 14 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-14 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sat 15 May Lively busier than 63% of days here · Germany school holidays
Record Kos on Sat 15 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-15 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sun 16 May Busy busier than 66% of days here · Germany public holiday
Record Kos on Sun 16 May 2027 is forecast Busy. Why: Germany public holiday; Netherlands public holiday. Nearest calmer day: Sat 15 May (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/kos/#d-2027-05-16 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Mon 17 May Busy busier than 66% of days here · Germany public holiday
Record Kos on Mon 17 May 2027 is forecast Busy. Why: Germany public holiday; Netherlands public holiday; Italy public holiday. Nearest calmer day: Sat 15 May (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/kos/#d-2027-05-17 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Tue 18 May Busy busier than 66% of days here · ⚓1 · Germany school holidays
- AIDAblu — guest capacity 2,192
Record Kos on Tue 18 May 2027 is forecast Busy. Why: school holidays in Germany. 1 cruise ship scheduled, at least 2,192 guests at double occupancy. Nearest calmer day: Wed 19 May (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/kos/#d-2027-05-18 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Wed 19 May Lively busier than 63% of days here · Germany school holidays
Record Kos on Wed 19 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-19 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Thu 20 May Lively busier than 63% of days here · Germany school holidays
Record Kos on Thu 20 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-20 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Fri 21 May Lively busier than 63% of days here · Germany school holidays
Record Kos on Fri 21 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-21 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sat 22 May Lively busier than 63% of days here · Germany school holidays
Record Kos on Sat 22 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-22 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sun 23 May Lively busier than 62% of days here · Germany school holidays
Record Kos on Sun 23 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-23 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Mon 24 May Lively busier than 62% of days here · Germany school holidays
Record Kos on Mon 24 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-24 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Tue 25 May Lively busier than 62% of days here · Germany school holidays
Record Kos on Tue 25 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-25 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Wed 26 May Lively busier than 62% of days here · Germany school holidays
Record Kos on Wed 26 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-26 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Thu 27 May Busy busier than 65% of days here · Germany public holiday
Record Kos on Thu 27 May 2027 is forecast Busy. Why: Germany public holiday. Nearest calmer day: Wed 26 May (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/kos/#d-2027-05-27 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Fri 28 May Lively busier than 62% of days here · Germany school holidays
Record Kos on Fri 28 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-28 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sat 29 May Lively busier than 60% of days here · Germany school holidays
Record Kos on Sat 29 May 2027 is forecast Lively. Why: school holidays in Germany. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-29 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Sun 30 May Lively busier than 59% of days here
Record Kos on Sun 30 May 2027 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/kos/#d-2027-05-30 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Mon 31 May Busy busier than 65% of days here · UK public holiday
Record Kos on Mon 31 May 2027 is forecast Busy. Why: UK public holiday. Nearest calmer day: Sun 30 May (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/kos/#d-2027-05-31 (Avoid-Crowds, as of 16 Sep 2026; recomputed nightly.)
Which week of May is quietest in Kos?
No week of May is meaningfully quieter — the typical day is Lively throughout; pick by day instead.
Can't move the dates? How to avoid the worst crowds
- Need flexibility? The 7th–15th 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.
May weather in Kos
Comfortably warm — around 23°C / 74°F, easy shirtsleeve weather, with rain on only about 4 days.
Worth booking the marquee sights ahead for the busy days, but you can keep the rest of the trip flexible.
More about Kos in May
Based on: Greece's public holidays · school vacations across Germany and the Netherlands · the season pattern from official overnight stays · 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.
