May 21 is statistically one of the best days of the year in Mykonos. With minimal rain risk (4%) and pleasant highs of 22°C, it's ideal for outdoor adventures. You'll enjoy Mykonos with reasonable crowd levels and competitive accommodation options.
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Essential Travel Info for Mykonos
Currency
EUR
€ Euro
Language
Greek
Driving
Right side
Connect
Truly the cheapest way to call abroad is...
Safety
High Safety
GPI: 1.838
Mykonos Weather Forecast for May 21
"Mild & Comfortable. Expect average highs of 21.9°C. 4% chance of rain."
What to Wear in Mykonos in May
Based on historical data for May 21, Mykonos typically experiences temperatures between 17.6°C and 21.9°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (4% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Mykonos
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
21.9°C
Daytime Peak
Average Low
17.6°C
Nighttime Low
Feels Like
22.2°C
☀️ Feels accurate
Rain Chance
4%
Avg 0.1mm if it rains
Cloud Cover
31%
Overcast
Pressure
1012.9 hPa
Low volatility
Mykonos Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 100% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30+ required, seek shade
05:00 - 10:00
16:00 - 19:00
Type I-II
🔴 11 min to burn
Type III-IV
🟡 17 min to burn
Type V-VI
🟢 28 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.8°C
Noticeable
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Greece
Flight Traffic
Moderate
44/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~20
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Mykonos
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:06
☀️ Noon
12:16
🌇 Sunset
19:26
⏱️ Daylight
14h 19m
Wind Speed
26.6 km/h
Moderate wind
Sunshine
12.4 hrs
Direct Sun (Cloud-free)
Humidity
73%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Mykonos
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Mykonos
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Mild discomfort possible for arthritic conditions.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Active seismic zone. Multiple earthquakes per year.
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Mykonos on May 21 averages 21.9°C with a 4% precipitation probability. Wedding/Outdoor Event Score: 98/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Mykonos Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Mykonos Worth Visiting on May 21?
Planning a trip to Mykonos on May 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 21.9°C with a 4% historical precipitation risk.
✈️ Travel Logistics: Approximately 20 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 6 vaccinations are recommended for Greece, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 19.1°C (refreshing tonic). Wave conditions are generally fun waves with heights around 0.68m.
📊 Historical Extremes: The hottest May 21 recorded in the last 30 years saw temperatures hit 26°C in 2019, while the coldest dropped to 16.2°C in 2025.