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 ·
Kos enjoys a classic Mediterranean climate with long, hot summers and mild, damp winters. The live forecast above shows conditions typical for this time of year, so you can plan your day accordingly.
What is the weather like on Kos throughout the year?
Summers run from June to September, with daytime highs often reaching the low thirties Celsius and clear blue skies. Winters are much cooler, with temperatures around 12–16°C and most of the island’s modest rainfall occurring between November and February. Spring and autumn offer pleasant warmth and fewer crowds, making them ideal for sightseeing.
When is the best time to visit Kos?
For guaranteed beach weather, July and August are peak season, but the heat can be intense. May, June, September and early October provide a good balance of sunshine and comfortable temperatures, perfect for exploring the island’s ancient sites and coastal trails without the summer crush.
Does Kos get very windy?
Yes, a northerly wind called the meltemi often blows in July and August, bringing welcome relief from the heat. It can make the sea choppier on the north coast but is generally not strong enough to disrupt a holiday.
Is Kos warm enough for a holiday in October?
October remains pleasantly warm, with average highs around 24°C and sea temperatures still above 22°C. You’ll get plenty of sunshine, though occasional light showers become more likely towards the end of the month.
Does it rain much in winter on Kos?
Winter is the wettest season, but total rainfall is modest compared to northern Europe. Expect around 6–8 rainy days per month from December to February, with many clear interludes for exploring historic sites.
For more holiday climate comparisons, check our UK weather hub or read about nearby Crete weather.