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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Southampton Wire weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
May in Kos brings warm, sunny days with average highs around 24°C and sea temperatures reaching 19°C, making it a pleasant shoulder month before the summer heat sets in.
What is the weather like in Kos during May?
Kos enjoys long, bright days in May, with around ten hours of sunshine daily. The live forecast above shows typical conditions for this time of year: light meltemi breezes keep the air fresh, and rain is infrequent—usually just a handful of showers across the month. Evenings cool down to about 15°C, so a light jacket is handy for coastal strolls.
Is the end of May warm enough for swimming?
Yes, by the end of May the sea has warmed sufficiently for most visitors to swim comfortably. The water temperature reaches around 20–21°C, and with the sun high and UV index strong, beach days are popular. If you’re planning a trip for Crete weather comparisons, note that Kos tends to be slightly breezier in late spring.
Does Kos have strong winds in May?
Occasionally the meltemi wind picks up in the afternoon, especially near the coast, but it rarely exceeds a fresh breeze. Marmari and the northern beaches can feel gustier, but it’s generally comfortable.
How does Kos weather in May compare to June?
June is hotter and drier, with average highs of 29°C and sea temperatures above 23°C. If you prefer milder conditions for walking or sightseeing, kos weather may june transitions are best experienced in late May.
Should I check AccuWeather for Kos in May?
Many travellers use kos weather may accuweather for hourly breakdowns, but the Met Office and BBC provide reliable UK-focused forecasts. The live forecast above gives a solid overview for your trip.
For a broader picture of spring conditions across the Mediterranean, see our UK weather hub or check the 10 day weather forecast UK for comparison. If you’re also considering other Greek islands, our Malta weather page offers a similar climate profile. For those curious about weather in kos end of may, it remains one of the most comfortable periods to visit before the peak summer crowds.