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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Reading Wire weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
May in Kos brings reliably warm, sunny days with average highs around 24°C, making it one of the best months for a peaceful beach holiday before the peak summer crowds arrive.
What is the weather like in Kos throughout May?
The month starts pleasantly mild, with temperatures climbing from around 22°C early on to 26°C by the end. Sea temperatures hover near 19°C, still a bit fresh for swimming unless you’re brave. You can expect roughly ten hours of sunshine daily, with only a handful of rainy days — usually brief showers that pass quickly. The Meltemi wind occasionally picks up in the afternoon, offering a natural cool-down.
Is May a good month to visit Kos?
Yes, it’s an ideal window. The weather is warm enough for sunbathing and sightseeing but without the intense heat of July or August. Flights and accommodation are cheaper than summer rates, and the island’s archaeological sites, like the Asklepieion, are far less crowded. Pack light layers for cooler evenings and a windbreaker if you plan to take a boat trip.
Does it rain a lot in Kos during May?
No, May is one of the driest months. You’ll typically see only around four days with measurable rain, usually as short, light showers. The rest of the month is predominantly sunny and clear.
Can you swim in the sea in May in Kos?
The sea temperature averages 19°C, which many find a bit cool for prolonged swimming. By late May it may reach 21°C, and sheltered bays can be warmer. Most people wait until June for comfortable swimming.
How does Kos weather in May compare to Crete or Malta?
Kos is similar to Crete in May, both seeing mid-20s highs. Malta in May is slightly warmer by a degree or two and a touch drier. All three are excellent choices for a spring getaway.