December 21 is generally a great time to visit Athens. While there is a slight chance of rain (15%), showers are usually brief. Expect comfortable 13°C weather. You'll find plenty of company in Athens this month as tourism activity remains quite robust.
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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 December 21
"Mild & Comfortable. Expect average highs of 13.1°C. 15% chance of rain."
What to Wear in Athens in December
Based on historical data for December 21, Athens typically experiences temperatures between 6.3°C and 13.1°C. We recommend packing heavy coat, scarf, gloves to stay comfortable. Trends suggest it will stay mostly dry (15% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Athens
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
Average High
13.1°C
Daytime Peak
Average Low
6.3°C
Nighttime Low
Feels Like
12.6°C
🌤️ Feels accurate
Rain Chance
15%
Avg 0.8mm if it rains
Cloud Cover
52%
Overcast
Pressure
1019.6 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 94% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
9.2°C
Dry air
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
Business Day
Standard hours in Greece
Flight Traffic
Busy
64/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~535
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Athens
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:38
☀️ Noon
12:24
🌇 Sunset
17:10
⏱️ Daylight
9h 31m
Wind Speed
13.1 km/h
Gentle breeze
Sunshine
6.7 hrs
Direct Sun (Cloud-free)
Humidity
77%
Humid / Damp
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
💰💰💰 Expensive
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 December 21 averages 13.1°C with a 15% precipitation probability. Wedding/Outdoor Event Score: 87/100."
— 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
Better Alternatives Nearby
Consider these dates within ±7 days
December 19
13.2°C • 13% rain
Score
93
December 25
13.3°C • 14% rain
Score
93
December 22
13.1°C • 15% rain
Score
92
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Athens Worth Visiting on December 21?
Planning a trip to Athens on December 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 13.1°C with a 15% historical precipitation risk.
✈️ Travel Logistics: Approximately 535 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 17.4°C (refreshing tonic). Wave conditions are generally lake-like with heights around 0.26m.
📊 Historical Extremes: The hottest December 21 recorded in the last 30 years saw temperatures hit 17.8°C in 2019, while the coldest dropped to 3.3°C in 2016.