May · Greece
Best time to visit Kos in May Weather, crowds & prices
Weather in Kos in May
Average temperature 20°C, 16 mm of rain, about 31 days with 6+ hours of sunshine and 68% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
8.8/10
Ranked #6 of 12 months
- Avg temp
- 20°C
- Rainfall
- 16 mm
- Humidity
- 68%
- Days with 6h+ sun
- 31
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
May in Kos scores 8.8/10 for beach and coastal travel - an above-average month (#6 of 12). Expect around 20°C, 16 mm of rain, and roughly 31 days with 6+ hours of sunshine this month.
Kos pairs the Asklepion and a plane tree linked to Hippocrates with sandy beaches and flat cycling routes.
May in Kos — one of the year's strongest windows (6th)
With 20°C (69°F) on average, May delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.
With around 16 mm of rain, any showers tend to pass through rather than settle in; about 31 days with 6+ hours of sunshine and 14.1 hours of daylight fill the rest.
On our climate-comfort scale this is one of the strongest months of the year for Kos at 8.8/10 (6th of 12), just behind June at 10/10.
Pack light clothing, swimwear and real sun protection.
Expect mid-season pricing, and crowds are moderate.
Frequently asked
- What is the weather like in Kos in May?
- In May, Kos averages 20°C, 16 mm of rain, and about 31 days with 6+ hours of sunshine. Its climate-comfort score is 8.8/10.
- Is May a good time to visit Kos?
- May earns a 8.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Kos in May?
- Expect about 16 mm of rain in May. Average humidity is 68% and there are about 31 days with 6+ hours of sunshine.
Curated in Kos
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Kos, Greece. Live activities and tours from GetYourGuide, matched to this destination.