Kos weather in September
September in Kos: warm, dry — one of the best months to visit.
#1 of 12 months in Kos · #204 of 897 destinations to visit in September · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Kos in September
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Kos climate normals — September
| Daytime high | 26°C / 78°F | 🌤 warm |
|---|---|---|
| Nighttime low | 24°C / 74°F | |
| Rainfall | 5 mm / 0.2 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 20°C / 67°F | |
| Sunshine | 11.4 h/day | |
| Daylight | 12.4 h | |
| Wind | 31 km/h / 19 mph | |
| Air quality (US AQI) | 56 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Kos in September — FAQ
- Is September a good time to visit Kos?
- September in Kos: warm, dry — one of the best months to visit. It ranks #1 of 12 months for Kos on SeasonMap's comfort score (89/100).
- What is the weather like in Kos in September?
- In September, Kos averages a daily high of 25.8°C and a low of 23.5°C, with about 4.6 mm of rain over roughly 1 rainy days.
- What is the air quality in Kos in September?
- Kos has a mean US Air Quality Index of about 56 in September.