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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the StoryShift weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
May in Kos offers warm, settled weather with average highs of 24°C and long sunshine hours, making it an excellent choice for a late-spring break before the peak summer heat arrives.
What is the weather like in Kos at the end of May?
By the end of May, the island is firmly in spring-to-summer transition. Daytime temperatures typically reach 24–26°C, with sea temperatures around 20°C—pleasant for swimming. The chance of rain is low, and the meltemi wind is not yet strong, so conditions are calm. For a reliable outlook, cross-reference the live forecast above with longer-range data from kos weather may accuweather.
What should I pack for Kos in May?
Lightweight layers work best. Bring T-shirts, shorts, a sun hat and sunscreen for the day, plus a light jacket or jumper for cooler evenings. A swimsuit is useful for warmer afternoons, and comfortable sandals or walking shoes are essential for exploring sites like Marmari. For specific coastal conditions, check marmari kos weather may.
Is Kos too cold for swimming in May?
Not usually. Sea temperatures average 20°C by late May, which is comfortable for most swimmers. The water warms further into June, so kos weather june is better for prolonged swimming.
How does Kos weather in May compare to June?
May is slightly cooler and greener, with fewer crowds. June brings higher temperatures (averaging 28°C) and less rain. For a direct comparison, see kos weather may june data.
Does it rain much in Kos during May?
Rain is infrequent, averaging only 15mm across four days. Showers are usually brief and light, so they rarely disrupt plans. For longer-range checks, use weather in kos end of may forecasts.
For more UK holiday inspiration, explore our UK weather hub or compare with Crete Weather and Malta Weather.