Greece
Best Time to Visit Kos
Kos is a dependable Greek island with long, hot summers and mild winters. The best time to visit balances good weather with manageable visitor numbers, typically late spring or early autumn.
✦ Go in May or September for the sun without the summer crush.
✅ Best months
May and September are ideal: warm enough for swimming and sightseeing (24-28°C), but without the intense heat and peak-season crowds of July and August.
🔥 Peak season
July and August are peak months. Hotel prices can double, and beaches and ancient sites like the Asklepieion get packed. The Kos Hippocrates Festival (August) draws extra visitors with cultural events.
💷 Shoulder (best value)
June and September are the best budget shoulder months. June offers reliable summer heat with 30-40% lower accommodation costs than August, while September has slightly cooler temperatures and quieter streets.
🌙 Quietest & cheapest
December to February is the quietest and cheapest period, but many hotels and restaurants close, and the sea is too cold for swimming. Temperatures hover around 10-15°C, with frequent rain.
Kos season by season
Spring (Mar–May)
Weather: 10-25°C, sunny but with occasional showers
Crowds: low
Good for hiking, wildflowers, and visiting ruins without crowds.
Summer (Jun–Aug)
Weather: 25-35°C, mostly clear and dry
Crowds: high
Best beach weather, but expect heat and full resorts.
Autumn (Sep–Nov)
Weather: 15-30°C, dry and sunny into October
Crowds: medium
Settled weather for swimming and exploring, with lower prices in late October.
Winter (Dec–Feb)
Weather: 8-15°C, rainy and windy
Crowds: low
Very few tourists; local life continues, but many facilities shut.
🎭 Events worth timing a trip around
Kos Hippocrates Festival (August) – two weeks of theatre, music, and dance at the ancient Odeon. Also, the International Sailing Week (usually June) draws yachting enthusiasts.
🧳 What to pack
Pack a light jumper or long-sleeved top even in summer, because evening sea breezes can feel chilly after sunset on the coast.
Found your dates? Get your hotel briefing.
Room tips, the 14-day forecast for your exact stay, dining, transport and more — free for any Kos hotel.
Researched & reviewed by the TripSage editorial team · Updated July 2026.