Travel time: Year-round
Mykonos is defined by its Mediterranean climate, categorized by long, arid summers and short, mild winters. Known famously as the "Island of the Winds," its weather is dictated by its position at the center of the Aegean Sea. Unlike the lush, humid islands of the Ionian, Mykonos is naturally dry and rocky, with a landscape that transforms from vibrant green in the spring to a sun-bleached, golden ochre by mid-summer.
In Mykonos, the day follows a predictable atmospheric cycle. Mornings are typically still and clear, making it the best time for boat trips or quiet walks through Chora. As the sun climbs, the pressure gradient shifts, often calling forth the winds by midday. Even on the hottest July afternoons, the humidity remains low (averaging 50–60%), which prevents the sweltering "sticky" heat found in mainland cities. Evenings bring a quick drop in temperature as soon as the sun dips below the horizon, often requiring a light layer even in summer due to the persistent breeze.
Summer is peak season, characterized by intense sunshine and temperatures averaging 26°C to 30°C (79°F to 86°F), though heatwaves can push highs toward 35°C (95°F). Rainfall is virtually non-existent. This season is synonymous with the Meltemi, a powerful northerly wind that acts as nature’s air conditioner, keeping the island significantly cooler than the Greek mainland.
September is arguably the island’s most temperate month. The sea has reached its maximum warmth (around 24°C/75°F), and the Meltemi begins to subside. October brings a softer light and the first occasional rain showers toward the end of the month. Average highs remain pleasant at 20°C to 24°C (68°F to 75°F).
Winter is mild but erratic. While snow is a rare phenomenon, the island experiences most of its 500mm of annual rainfall during these months. Temperatures hover between 9°C and 15°C (48°F to 59°F). The winds change direction, blowing from the south, which can bring warmer but more humid air and dramatic storms.
Spring is a period of rapid blooming. Thousands of wildflowers cover the hillsides before the summer dry spell. Temperatures rise to a comfortable 18°C to 23°C (64°F to 73°F). While the sun is bright, the Aegean Sea remains brisk, taking until late May to become comfortable for swimming.
The most specific weather phenomenon in Mykonos is the Meltemi. Born from the pressure difference between the Balkans and Africa, these northern winds are strongest in July and August.
Despite its small size (85 sq km), Mykonos has distinct microclimates based on exposure:
Historically, the arid climate of Mykonos forced locals to become masters of water conservation, using stone cisterns to capture winter rain. Today, the whitewashed architecture isn't just aesthetic; the thick stone walls and lime-wash help reflect the intense summer radiation, keeping interiors cool. Even in the height of summer, a local will tell you that it is the wind, not the sun, that dictates the soul of the day.