Kos Town weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: June – September
What is the weather like in Kos Town in September?
In September, Kos Town is warm: daytime highs average 25 °C, and even at night it stays warm at around 23 °C. The sea averages 24.6 °C – pleasant for swimming. The sun shines for around 9 hours a day. Rain is rare: about 2 days bring 19 mm in total. The air is often humid and muggy. All in all, September is an excellent month for a holiday in Kos Town.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 100 | 100 | 73 |
| Day | 27° | 25° | 22° |
| Night | 25° | 23° | 20° |
| Sea | 25° | 25° | 23° |
| Sun | 10 h | 9 h | 7 h |
| Rain days | 0 | 2 | 5 |
More details for September
- Daylight
- 12 h 28 min06:52 – 19:20
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 20 daysdew point 18 °C or more
- Wind
- 20 km/haverage daily peak
- Cloud cover
- 11 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+3Europe/Athens
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %98 %
- Few rainy daysweight 20 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
Kos Town in September: quick answers
Is Kos Town hot in September?
Warm rather than hot: in September, daytime highs in Kos Town average 25 °C and nights cool to about 23 °C.
Can you swim in Kos Town in September?
Yes. In September the sea averages 24.6 °C – pleasant for swimming.
Does it rain much in Kos Town in September?
Rain is rare: about 2 days bring 19 mm in total.
Kos Town month by month
The whole year in Kos TownAll destinations: GreeceWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)