September 20 is generally a great time to visit Thessaloniki. While there is a slight chance of rain (19%), showers are usually brief. Expect comfortable 25°C weather. Expect a bustling atmosphere in Thessaloniki right now—this is when the city truly comes alive with visitors.
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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 September 20
"Warm & Sunny. Expect average highs of 25.3°C. 19% chance of rain."
What to Wear in Thessaloniki in September
Based on historical data for September 20, Thessaloniki typically experiences temperatures between 16.9°C and 25.3°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (19% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Thessaloniki
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
25.3°C
Daytime Peak
Average Low
16.9°C
Nighttime Low
Feels Like
26°C
☀️ Feels accurate
Rain Chance
19%
Avg 1.1mm if it rains
Cloud Cover
40%
Overcast
Pressure
1015.9 hPa
Medium volatility
Thessaloniki 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 30 recommended
06:00 - 10:00
16:00 - 18:00
Type I-II
🔴 24 min to burn
Type III-IV
🟡 36 min to burn
Type V-VI
🟢 60 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
18.7°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Marine Conditions
Jellyfish Warning
High water temps may attract jellyfish swarms.
Swim Index
✅ Excellent Swimming Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Greece
Flight Traffic
High
94/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~94
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Thessaloniki
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:14
☀️ Noon
12:23
🌇 Sunset
18:31
⏱️ Daylight
12h 16m
Wind Speed
11.5 km/h
Light breeze
Sunshine
9.9 hrs
Direct Sun (Cloud-free)
Humidity
67%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Thessaloniki
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
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
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
Moderate seismic activity. Occasional tremors possible.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Thessaloniki on September 20 averages 25.3°C with a 19% precipitation probability. Wedding/Outdoor Event Score: 99/100."
— 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
September 13
27.5°C • 13% rain
Score
100
September 14
27.5°C • 12% rain
Score
100
September 15
27.4°C • 11% rain
Score
100
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 20) in other destinations
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🌍 Explore the same date in different destinations around the world
📍 Is Thessaloniki Worth Visiting on September 20?
Planning a trip to Thessaloniki on September 20? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 25.3°C with a 19% historical precipitation risk.
✈️ Travel Logistics: Approximately 94 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 26.7°C (tropical bath). Wave conditions are generally lake-like with heights around 0.13m.
📊 Historical Extremes: The hottest September 20 recorded in the last 30 years saw temperatures hit 29.6°C in 2017, while the coldest dropped to 11.9°C in 2019.