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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Evening Ledger weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
With the live forecast above as your guide, Kos in May brings warm, settled conditions as spring gives way to early summer – expect daytime highs around 22–25°C, plenty of sunshine, and a gentle meltemi breeze, making it one of the best months to visit.
What’s the typical weather pattern in Kos during May?
May is a transition month: morning and evening can be pleasantly cool (12–15°C), while afternoons feel properly warm. Rain is infrequent but possible early in the month. The sea is still refreshing rather than balmy. For a full outlook, see our UK weather hub.
- Average daily high: 24°C, low: 14°C
- Sunshine: 10–11 hours per day – ideal for sightseeing
- Rainfall: around 20mm over 4–5 days, mostly early May
- Sea temperature: 18–19°C – brave swimmers welcome
Does the weather hold up for beach days at Marmari or elsewhere?
Marmari (on the north coast) shares the same settled May pattern, often with a light breeze. End of May sees sea temperatures nudge up, making longer swims more comfortable. For comparison, check our Crete Weather page.
- Marmari average May temp: same as Kos town – 22–25°C
- Wind: northwesterly, moderate – good for windsurfing near Kardamena
- Evening: light jacket useful after sunset
Is May a good month to visit Kos?
Yes – it’s one of the best shoulder-season months. Crowds are thin, flights and accommodation are cheaper than summer, and the weather is warm but not oppressive. Perfect for hiking ruins or cycling the island.
What should I pack for Kos in May?
Light layers: shorts and T-shirts for daytime, a long-sleeved top and light jumper for evenings. A windproof jacket helps against the meltemi. Sun cream and a hat essential even in May – UV is strong.
How does Kos weather in late May compare to June?
Late May is very similar to early June – both offer sunny, dry conditions. June becomes a couple of degrees hotter (averaging 27–30°C) and the sea warms to around 22–23°C. For a preview, see our 10 Day Weather Forecast UK for comparison trends.