September 18 is statistically one of the best days of the year in Thessaloniki. With minimal rain risk (14%) and pleasant highs of 26°C, it's ideal for outdoor adventures. As it's peak season for Thessaloniki, we recommend booking your stay well in advance to secure the best rates.
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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 18
"Warm & Sunny. Expect average highs of 26.4°C. 14% chance of rain."
What to Wear in Thessaloniki in September
Based on historical data for September 18, Thessaloniki typically experiences temperatures between 17.4°C and 26.4°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (14% 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
26.4°C
Daytime Peak
Average Low
17.4°C
Nighttime Low
Feels Like
27.3°C
☀️ Feels accurate
Rain Chance
14%
Avg 0.8mm if it rains
Cloud Cover
34%
Overcast
Pressure
1015.1 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 81% 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
🔴 23 min to burn
Type III-IV
🟡 35 min to burn
Type V-VI
🟢 58 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
20°C
Humid/Sticky
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
06:12
☀️ Noon
12:23
🌇 Sunset
18:34
⏱️ Daylight
12h 22m
Wind Speed
11.2 km/h
Light breeze
Sunshine
10.1 hrs
Direct Sun (Cloud-free)
Humidity
68%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Thessaloniki
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
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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 18 averages 26.4°C with a 14% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— 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
Compare Other Cities
Same date (September 18) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Thessaloniki Worth Visiting on September 18?
Planning a trip to Thessaloniki on September 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 26.4°C with a 14% 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 27.1°C (tropical bath). Wave conditions are generally lake-like with heights around 0.16m.
📊 Historical Extremes: The hottest September 18 recorded in the last 30 years saw temperatures hit 34°C in 2017, while the coldest dropped to 15°C in 2022.