December 21 is statistically one of the best days of the year in Thessaloniki. With minimal rain risk (13%) and pleasant highs of 10°C, it's ideal for outdoor adventures. You'll find plenty of company in Thessaloniki this month as tourism activity remains quite robust.
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Essential Travel Info for Thessaloniki
Currency
EUR
€ Euro
Language
Greek
Driving
Right side
Connect
As of 2021, Thessaloniki has 5G from Cos...
Safety
High Safety
GPI: 1.838
Thessaloniki Weather Forecast for December 21
"Mild & Comfortable. Expect average highs of 9.5°C. 13% chance of snow."
What to Wear in Thessaloniki in December
Based on historical data for December 21, Thessaloniki typically experiences temperatures between 2.1°C and 9.5°C. We recommend packing heavy coat, scarf, gloves to stay comfortable. Trends suggest it will stay mostly dry (13% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Thessaloniki
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
Average High
9.5°C
Daytime Peak
Average Low
2.1°C
Nighttime Low
Feels Like
8.3°C
❄️ Minor difference
Snow Chance
13%
Avg 0.9mm if it snows
Snowfall
0.4 cm
~13% chance
Pressure
1020.6 hPa
High volatility
Thessaloniki Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 88% 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
5.9°C
Dry air
Heat Stress
Low
No heat warning
😐 Best outdoor time:
Midday (11 AM - 3 PM) when warmest
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
68/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~68
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Thessaloniki
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:49
☀️ Noon
12:27
🌇 Sunset
17:05
⏱️ Daylight
9h 15m
Wind Speed
8.6 km/h
Light breeze
Sunshine
6.2 hrs
Direct Sun (Cloud-free)
Humidity
78%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Thessaloniki
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in Thessaloniki
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Rapid pressure changes detected. High risk for meteosensitive people.
Weather unlikely to affect joint pain.
Fish are active due to pressure changes.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Moderate seismic activity. Occasional tremors possible.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Thessaloniki on December 21 averages 9.5°C with a 13% precipitation probability. Wedding/Outdoor Event Score: 71/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Thessaloniki Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
December 26
10.5°C • 15% rain
Score
75
December 25
10.3°C • 12% rain
Score
74
December 24
9.9°C • 13% rain
Score
73
💡 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 Thessaloniki Worth Visiting on December 21?
Planning a trip to Thessaloniki 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 9.5°C with a 13% historical precipitation risk.
✈️ Travel Logistics: Approximately 68 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 12.1°C (polar plunge). Wave conditions are generally lake-like with heights around 0.15m.
📊 Historical Extremes: The hottest December 21 recorded in the last 30 years saw temperatures hit 16.1°C in 2019, while the coldest dropped to -0.5°C in 2016.