Plan your perfect Kos getaway with our comprehensive 2025 weather guide. Discover the best months to visit, what to pack, and insider tips for every season on this beautiful Greek island.
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Why Weather Matters for Your Kos Experience
Kos enjoys a Mediterranean climate with over 300 sunny days per year, but choosing the right time can make or break your vacation. Here's everything you need to know about Kos weather in 2025.
Spring in Kos (March - May 2025)
March 2025
- Temperature: 15-18°C (59-64°F)
- Sea temperature: 16°C (61°F)
- Rainfall: Moderate (7-8 rainy days)
- Perfect for: Hiking, exploring ancient sites
April 2025
- Temperature: 18-22°C (64-72°F)
- Sea temperature: 17°C (63°F)
- Rainfall: Light (5-6 rainy days)
- Perfect for: Cycling, outdoor dining, photography
May 2025
- Temperature: 22-26°C (72-79°F)
- Sea temperature: 19°C (66°F)
- Rainfall: Minimal (3-4 rainy days)
- Perfect for: Beach activities, festivals, best overall weather
Summer in Kos (June - August 2025)
June 2025
- Temperature: 26-30°C (79-86°F)
- Sea temperature: 22°C (72°F)
- Rainfall: Very rare (1-2 rainy days)
- Perfect for: Swimming, water sports, island hopping
July 2025
- Temperature: 28-33°C (82-91°F)
- Sea temperature: 25°C (77°F)
- Rainfall: Almost none
- Perfect for: Beach life, nightlife, peak season fun
August 2025
- Temperature: 28-33°C (82-91°F)
- Sea temperature: 26°C (79°F)
- Rainfall: None
- Perfect for: Swimming, diving, summer festivals
Autumn in Kos (September - November 2025)
September 2025
- Temperature: 24-28°C (75-82°F)
- Sea temperature: 23°C (73°F)
- Rainfall: Light (3-4 rainy days)
- Perfect for: Best overall month - warm but not hot
October 2025
- Temperature: 20-24°C (68-75°F)
- Sea temperature: 20°C (68°F)
- Rainfall: Moderate (6-7 rainy days)
- Perfect for: Hiking, sightseeing, wine tasting
Best Months to Visit Kos in 2025
🏆 May 2025 - The Sweet Spot
Perfect weather without summer crowds:
- Warm but comfortable temperatures
- Lower accommodation prices
- Everything open, fewer tourists
- Perfect for all outdoor activities
🥈 September 2025 - Second Best
Post-summer perfection:
- Warm sea temperatures
- Comfortable air temperatures
- Shoulder season pricing
- Ideal for families and couples
🥉 June 2025 - Summer Start
Beginning of peak season:
- Guaranteed sunshine
- Perfect swimming conditions
- All tourist facilities fully operational
- Slightly higher prices than May
What to Pack for Each Season
Spring Packing List
- Light layers (t-shirts + light jacket)
- Comfortable walking shoes
- Light rain jacket
- Sunscreen and hat
Summer Packing List
- Lightweight, breathable clothing
- Strong sunscreen (SPF 30+)
- Hat and sunglasses
- Swimwear and beach gear
- Evening attire for dining out
Autumn Packing List
- Mix of summer and light winter clothes
- Light sweater for evenings
- Comfortable walking shoes
- Light rain protection
Monthly Highlights for 2025
April 2025: Easter Celebrations
Experience authentic Greek Easter traditions with perfect spring weather.
July 2025: Kos Summer Festival
Cultural events and performances under starlit summer skies.
September 2025: Wine Harvest Season
Perfect weather for exploring local wineries and vineyards.
Weather-Based Activity Recommendations
Hot Summer Days (July-August)
- Early morning beach visits (7-10 AM)
- Afternoon siesta (2-5 PM)
- Evening activities and dining
- Water sports and swimming
Mild Weather Days (May, September)
- Perfect for all-day outdoor activities
- Ideal hiking weather
- Comfortable sightseeing
- Great for photography
Insider Weather Tips for 2025
- Meltemi winds peak in July-August (great for windsurfing)
- Sea temperatures remain warm until October
- Spring flowers bloom best in April-May
- October can have sudden rain showers
- Winter months (Dec-Feb) are mild but windy
