April 21 is statistically one of the best days of the year in Athens. With minimal rain risk (9%) and pleasant highs of 21°C, it's ideal for outdoor adventures. You'll enjoy Athens with reasonable crowd levels and competitive accommodation options. Note: April 21 is Easter Monday in Athens, so expect special events, closures, and festive atmosphere.
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Essential Travel Info for Athens
Currency
EUR
€ Euro
Language
Greek
Driving
Right side
Connect
As of Sept 2021, Athens has 5G from Cosm...
Safety
High Safety
GPI: 1.838
Athens Weather Forecast for April 21
"Mild & Comfortable. Expect average highs of 20.7°C. 9% chance of rain."
What to Wear in Athens in April
Based on historical data for April 21, Athens typically experiences temperatures between 11.5°C and 20.7°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (9% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Athens
Smart Suitcase
- Light Jacket
- Long Pants
Average High
20.7°C
Daytime Peak
Average Low
11.5°C
Nighttime Low
Feels Like
20.8°C
☀️ Feels accurate
Rain Chance
9%
Avg 0.3mm if it rains
Cloud Cover
41%
Overcast
Pressure
1014.2 hPa
Medium volatility
Athens 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 recommended
05:00 - 10:00
16:00 - 19:00
Type I-II
🔴 16 min to burn
Type III-IV
🟡 24 min to burn
Type V-VI
🟢 40 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
13.4°C
Pleasant
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
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Holiday
Easter Monday
Flight Traffic
Moderate
48/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~404
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Athens
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:43
☀️ Noon
12:24
🌇 Sunset
19:06
⏱️ Daylight
13h 23m
Wind Speed
15 km/h
Gentle breeze
Sunshine
11.3 hrs
Direct Sun (Cloud-free)
Humidity
63%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Athens
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Athens
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
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, Athens on April 21 averages 20.7°C with a 9% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Athens Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (April 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Athens Worth Visiting on April 21?
Planning a trip to Athens on April 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 20.7°C with a 9% historical precipitation risk.
🎉 Local Event: The date coincides with Easter Monday, which may influence local business hours and event availability.
✈️ Travel Logistics: Approximately 404 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 6 vaccinations are recommended for Greece, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 17.8°C (refreshing tonic). Wave conditions are generally lake-like with heights around 0.33m.
📊 Historical Extremes: The hottest April 21 recorded in the last 30 years saw temperatures hit 24.1°C in 2025, while the coldest dropped to 5.8°C in 2019.