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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the ScopePress weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Daytime highs in Kos during May typically range from 22°C to 26°C, with sea temperatures around 19°C to 21°C and nine to ten hours of daily sunshine. This means warm, settled spring weather ideal for exploring before the peak summer heat arrives.
What is the weather like in Kos in May?
May sees a sharp rise in temperatures compared to April. The live forecast above shows current conditions, but historically the island averages 22–26°C for highs and 15–18°C for lows. Sea temperatures reach 19–21°C, making early-season swimming possible. Rainfall drops to just two to four days in the month, and winds are generally light. For comparison, Crete in May follows a similar pattern, though Kos tends to be slightly cooler early in the month.
Is May a good time to visit Kos?
Yes – May offers a balance of warmth and fewer crowds. The weather in Kos at the end of May is particularly pleasant, with highs often touching 26°C and sea temperatures rising above 20°C. If you are considering kos weather may june transitions, May is noticeably quieter than June, though June brings hotter days and warmer seas. For those checking kos weather may accuweather forecasts, expect consistent sunny spells with only occasional cloud. The resort of marmari kos weather may mirrors the island average, with coastal breezes keeping afternoons comfortable.
Can you swim in Kos in May?
Yes, though the sea is still cool at 19–21°C. Many visitors swim comfortably by late May, especially on sheltered beaches. Wetsuits are rarely needed, but early May can feel brisk.
Does it rain much in Kos in May?
Rain is infrequent – typically two to four days across the month, with totals around 15–25mm. Most days are dry and sunny, making it a reliable month for outdoor plans.
How does Kos weather in May compare to June?
June is hotter (highs 28–32°C) and even drier, with sea temperatures reaching 23°C. May is milder and less crowded, ideal for hiking or sightseeing. For kos weather june details, see our dedicated page.
For a broader outlook, visit the UK weather hub or check the 10-day forecast for the UK if you are planning travel from Britain. Other Greek islands such as Crete offer similar May conditions, though local wind patterns can differ.