Kos · AutumnMonth summary
Kos weather in September
✅ Excellent
🌡️ Temperature min / max
23°C – 27°C
🌧 Rainy days
4% of days
☀️ Sunshine
12.0h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
9.4/10
📅 📅 Best month
June (9.8/10)
Quick decision
Should you visit Kos in September?
✅ Excellent
✅ Yes if: you want to combine beach, sightseeing and hiking — versatile weather (27°C, little rain).
❌ No if: you want to avoid tourist crowds — this is the busiest period.
Our take: Visiting Kos in September is a safe bet: great weather, only 4% chance of rain.
By trip type
Kos in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ✅ Good
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 Ideal beach temperature (27°C) — crowds still moderate Autumn in Kos is often underrated: 27°C, 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.
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All months for Kos
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌦️ January | 11°C | 15°C | 42% | 3.7 | 9.0h | 5.8/10 |
| ⛅ February | 12°C | 16°C | 32% | 2.5 | 9.9h | 7.0/10 |
| ⛅ March | 13°C | 17°C | 23% | 1.7 | 11.0h | 7.2/10 |
| 🌤️ April | 15°C | 19°C | 16% | 1.0 | 12.1h | 7.7/10 |
| 🌤️ May | 18°C | 22°C | 12% | 0.5 | 13.4h | 8.6/10 |
| ☀️ June | 22°C | 27°C | 4% | 0.3 | 14.0h | 9.8/10 |
| ☀️ July | 24°C | 30°C | 1% | 0.0 | 13.8h | 9.4/10 |
| ☀️ August | 25°C | 30°C | 1% | 0.0 | 13.0h | 9.2/10 |
| ☀️ September | 23°C | 27°C | 4% | 0.2 | 12.0h | 9.4/10 |
| 🌤️ October | 19°C | 23°C | 11% | 0.7 | 10.1h | 8.3/10 |
| 🌤️ November | 16°C | 20°C | 28% | 2.7 | 9.8h | 7.4/10 |
| ⛅ December | 13°C | 17°C | 38% | 3.7 | 8.9h | 7.0/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Kos averages 27°C, 4% rainy days and 12.0h of sunshine per day. Overall weather score: 9.4/10.
See methodology →
Comparison
September vs June (best month)
The best month is June (score 9.8/10). Difference:
- 🌡️ Max temperature : +0°C
- 🌧 Rainy days : +0%
- ☀️ Sunshine : +2.0h/day
FAQ
FAQ — Kos in September
Is September a good time to visit Kos?
September is an excellent time to visit Kos (score 9.4/10). With 27°C, 12.0h of sunshine and 4% rain, conditions are very favourable.
What to do in Kos in September?
With 27°C and 12.0h of sunshine, all outdoor activities are possible: hiking, sightseeing and terraces.
Accommodation
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