İstanköy hava durumu: Mayıs

Regulars are consistent that weather here has more or less settled by mid-month, temperatures climbing past 30C by the end, with cloud or a little rain now the genuine exception rather than something to plan around. Our row backs that warm, genuinely dry read, 24.2C over 18.1C nights, with rain minimal at 13.4mm across just 3.1 days and humidity at 76 percent. Regulars are specific that the island's southeast side runs slightly warmer and drier than elsewhere, a real factor worth weighing when picking a base. The sea sits at a cool 19.6C, not yet warm enough for most to swim comfortably despite the reliably sunny days on land. The record: 12.5 hours of sun, a 21.8 kph wind and AQI 61.

Forum posters describe March in Kos as genuinely unpredictable but still mild overall, sitting outside the reliably hot, dry stretch that runs roughly June through early October. Posters note showers this time of year can affect one side of the island while leaving another completely dry, reflecting how localized spring weather patterns can be here. Posters consistently recommend packing layers and a light raincoat for a March visit, ready for both sunny stretches and passing rain within the same trip. Posters generally rate March as a mild, changeable shoulder-season month for Kos, well ahead of the settled summer heat but past the harshest of the Aegean winter.

September is the month Kos regulars call the best of the year — 25 to 30°C, the sea still at 27°C, everything open, and nowhere near July and August's crowds. Evenings want a cardigan. The thing to understand about the wind is that it is directional rather than seasonal: the meltemi is a northerly running June to about mid-September, so it hits the north coast hardest — Tigaki and Mastihari especially — and the forum's fix is simply to switch sides of the island, Kardamena being the usual suggestion. Kos reads breezy year-round on the monthly averages, but an average smooths over exactly the local, directional effect regulars are describing, so take the coast advice over the number. In the heat most people count it a cooling breeze rather than a problem.