The month in detail
What to expect in September
Autumn in Kos is often underrated: 81°F, golden light and declining crowds. An interesting window. Rain is virtually absent (4% of days) — ideal for planning without a backup. This is one of the best times of year to visit Kos.
September ranks 2 out of 12 months in Kos. Compared to August: −5°F daytime, −0.9h of sun per day.
This month's conditions
What it's like in September
UV index
6 · high
sunscreen and hat advised
Feels like
muggy at times
18°
Sea
26°C
warm, ideal
Daylight
12.2h of daylight
Air quality
good
AQI 39
Compare
Is September the right month?
The best month in Kos is June (9.4/10), 0.2 pt higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Kos
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Kos
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach trip.
Country · Greece
🗣️LanguageGreek
💶CurrencyEuro (€)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘModerate · 3/5
🌡️ Climate
🌍Climate typeTemperate oceanic
📈Climate trend ⓘStable
🔥Hottest monthJuly · 86°F
❄️Coolest monthJanuary · 59°F
🌧️Rainiest month ⓘJanuary · 29%
🏖️ Beach trip
📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) ⓘModérée
🛂VisaSchengen · 90 days
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Kos ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
GreeceTemperate oceanic climate with a 9.4 → 4.4 gap between best and worst month. 10 years of ERA5 data to choose by project.
36.89°N · 27.09°E
Questions
Frequently asked questions
What is the best time to visit Kos?
June is the best month with 81°F highs, 72°F lows, 10.0h of sunshine and 4.0% rainy days. The months of June & September offer comparable conditions.
How many hours of sunshine does Kos get in June?
Kos averages 10.0 sunshine hours per day in June. It is the sunniest month with a climate score of 9.2/10.
What is the rainiest month in Kos?
January is the most unfavourable month with January has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Kos in June?
In June, overnight lows reach 72°F, while afternoon highs average 81°F.
Is Kos good in winter?
In winter (December-February), Kos scores 5.2/10 on average — Difficult period — prefer the peak season.. The best month overall remains June with a score of 9.2/10.
When should you avoid Kos?
January is the most difficult month to visit Kos, with January has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Kos in September?
In September, the sea averages 79°F in Kos: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Kos in September?
The average UV index reaches 6 in September in Kos (high), with about 12.2h of daylight. Sunscreen and hat advised.