Kos weather in May
May in Kos: nice, dry, with very humid — an excellent time to visit.
#5 of 12 months in Kos · #425 of 897 destinations to visit in May · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Kos in May
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Kos climate normals — May
| Daytime high | 21°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 18°C / 64°F | |
| Rainfall | 9 mm / 0.3 in | ☀️ dry |
| Rainy days | 2 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 15°C / 60°F | |
| Sunshine | 12.6 h/day | |
| Daylight | 14.2 h | |
| Wind | 28 km/h / 17 mph | |
| Air quality (US AQI) | 58 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Kos in May — FAQ
- Is May a good time to visit Kos?
- May in Kos: nice, dry, with very humid — an excellent time to visit. It ranks #5 of 12 months for Kos on SeasonMap's comfort score (83/100).
- What is the weather like in Kos in May?
- In May, Kos averages a daily high of 20.8°C and a low of 18°C, with about 8.6 mm of rain over roughly 2.2 rainy days.
- What is the air quality in Kos in May?
- Kos has a mean US Air Quality Index of about 58 in May.