Kos in May: the weather and best activities for your holiday

Kos, the birthplace of Hippocrates, is a treasure trove of Greek history wrapped in Mediterranean splendour. This enchanting island combines archaeological wonders with pristine beaches, creating an irresistible destination where ancient ruins stand alongside vibrant coastal towns.

May marks one of the finest times to visit Kos, with warm sunshine and pleasant evenings perfect for outdoor dining. The island comes alive as beach clubs open their doors, yet retains its peaceful atmosphere before the summer crowds arrive. The crystal-clear waters are warming up nicely, though might still feel refreshing for prolonged swims.

The weather of Kos through the year

Kos basks in approximately 300 days of sunshine annually, with summer temperatures soaring from late June through early September. The winter months stay relatively mild, though can bring sporadic rainfall and cooler evenings. Sea breezes moderate the summer heat, while spring and autumn offer ideal conditions for exploration.

Kos weather in May

Daytime temperatures reach a warm 25C (77F), with nights staying mild at 16C (61F). The heat feels noticeable but not overwhelming, ideal for beach days and sightseeing. You'll rarely need more than a light cardigan for evenings, while afternoons provide a perfect balance of warmth without summer's intensity.

Daily sunshine increases to 10 hours, with daylight stretching to 14 hours. The sun rises earlier, typically around 6:15 AM, and sets later at 8:15 PM. The UV index climbs to high levels, making sun protection essential. Clear, cloudless days become the norm, with very rare rainfall.

Rain becomes increasingly rare in May, with just 3 wet days on average and around 20mm of total rainfall. Any precipitation typically comes as short-lived, light showers that quickly pass. Clear skies dominate, and outdoor activities are rarely affected by weather conditions.

The Aegean Sea warms noticeably to 19C (66F), becoming more inviting for swimming. While the initial entry might feel brisk, the water is comfortable enough for longer swims. Protected bays can reach slightly higher temperatures, particularly during calm, sunny afternoons.

One of the best months to visit Kos, combining warm 25C (70F) days with minimal rainfall and comfortable evening temperatures. The tourist season is ramping up, but hasn't reached summer's peak levels, creating an ideal balance of atmosphere and space. Most facilities are open, the sea is warming nicely, and the island feels alive without being overcrowded. The weather suits both beach days and exploration, making it perfect for visitors wanting to experience all aspects of the island.

Clothes to pack for May in Kos

Warm days mean summer clothes are essential: shorts, t-shirts, sundresses, and swimming gear will be your daily staples. Light long-sleeved tops and a cardigan are useful for evenings when temperatures dip to 16C (61F). Comfortable walking sandals and breathable walking shoes are important for sightseeing. Sun protection becomes crucial, so pack a sun hat and sunglasses. One light jumper should suffice for cooler evenings, particularly near the coast.

The best months to visit Kos

May and September share the crown for Kos's finest months. These shoulder season periods offer warm, sunny days without July and August's intense heat and crowds. Swimming is pleasurable, sightseeing is comfortable, and the island maintains a lively yet peaceful atmosphere. The spring brings wildflowers in May, while September offers peak sea temperatures.

The worst months to visit Kos

Winter months (December to February) see many facilities closed and limited flight options. While temperatures remain mild compared to northern Europe, ranging from 8-15C (46-59F), frequent rainfall and wind can disrupt outdoor activities. The sea is too cold for swimming, and island life is very quiet.

Sights and activities for Kos during May

May's agreeable climate makes it ideal for exploring Kos Town's ancient treasures, starting with the imposing Castle of the Knights. This 15th-century fortress, perched at the harbour entrance, offers spectacular views across to Turkey. The castle's massive walls and towers are particularly photogenic in May's clear morning light.

The Ancient Agora, spanning 2,000 years of history, sprawls across 13 acres beside the harbour. This vast archaeological site reveals layers of civilisation, from Roman baths to Christian basilicas. May's wildflowers sprout between ancient columns, creating enchanting photo opportunities.

The Asklepieion, Kos's most significant ancient site, sits in the hills 4km southwest of Kos Town. This healing temple complex, where Hippocrates once taught, spans three stunning terraces with magnificent views across to Turkey. The site is particularly magical in early morning or late afternoon when May's softer light bathes the ancient stones.

Paradise Beach, on the island's south coast, lives up to its name with crystal waters and fine sand. May's temperatures make it perfect for windsurfing, with steady afternoon breezes providing ideal conditions for both beginners and experienced riders.

Thermal Beach at Thermes offers a unique experience where hot springs meet the sea. In May's mild sea temperatures, these natural hot pools feel particularly welcoming. Visit in early morning to have this remarkable spot largely to yourself.

The Mountain Bike Trail to Zia village provides an exhilarating way to explore the island's interior. The trail winds through pine forests and traditional villages, with May's clear days offering stunning views across to neighbouring islands. Zia itself is famous for its sunset views and traditional tavernas.

The Plaka Forest, a peaceful pine woodland, houses hundreds of peacocks and other wildlife. May sees young peacocks strutting their stuff, making it an excellent time for nature photography. The forest's paths provide welcome shade during afternoon walks.

For a taste of traditional island life, the fishing village of Mastichari offers authentic charm without summer crowds. Its waterfront tavernas serve the morning's catch, while the beach's steady winds make it a kitesurfing hotspot in May's reliable conditions.

Other holiday destinations recommendations for May

Here's a selection of recommended May holiday destinations, thoughtfully chosen for their ideal weather conditions and experiences during this time of year.

The Greek Islands shine particularly brightly in May, with Rhodes offering perfect temperatures around 23-25°C. The medieval Old Town remains peaceful before summer crowds descend, while Crete presents ideal conditions for exploring the dramatic Samaria Gorge. Santorini's famous caldera views can be enjoyed without the cruise ship crowds that characterise peak season.

Along the Mediterranean coast, Malta combines warming waters with historical sites and a peaceful atmosphere ahead of the summer rush. Cyprus sees excellent beach weather while keeping its inland sites, such as the Troodos Mountains, comfortable for exploration. The Turkish Riviera, especially around Antalya and Fethiye, provides excellent value with near-summer conditions.

Western Europe offers distinct spring charms in May. Provence comes alive with early purple lavender fields and perfect temperatures for wine tasting tours. The Italian Lakes, including Como and Garda, showcase spring flowers against dramatic mountain backdrops. Sicily achieves that perfect balance of beach-worthy weather while keeping its ancient sites comfortable to explore.

For those willing to venture further, Japan experiences ideal spring weather with late cherry blossoms still blooming in northern regions. Morocco's Marrakech remains pleasantly warm before summer's intensity takes hold. The Maldives enters its shoulder season, combining good weather with better value, while Bali begins its dry season, offering pre-peak season tranquility.

City breaks prove particularly rewarding in May. Barcelona strikes an ideal balance between beach and city life before summer tourists arrive in force. Lisbon's warm days prove perfect for wandering its historic hilltop districts, while Istanbul offers ideal conditions for exploring outdoor bazaars and taking Bosphorus cruises.

Nature and adventure destinations peak in May. The Azores combine perfect hiking weather with offshore whale watching opportunities. Croatia's Plitvice Lakes showcase spring waterfalls at their most dramatic, while Slovenia's Lake Bled pairs stunning mountain scenery with comfortable temperatures for outdoor activities.