September 17 is generally a great time to visit Sofia. While there is a slight chance of rain (21%), showers are usually brief. Expect comfortable 23°C weather. Sofia is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
View the full calendar
Essential Travel Info for Sofia
Currency
BGN
лв Bulgarian lev
Language
Bulgarian
Driving
Right side
Connect
5G internet is available from all three ...
Safety
High Safety
GPI: 1.541
Sofia Weather Forecast for September 17
"Mild & Comfortable. Expect average highs of 23.3°C. 21% chance of rain."
What to Wear in Sofia in September
Based on historical data for September 17, Sofia typically experiences temperatures between 12.7°C and 23.3°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (21% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Sofia
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
23.3°C
Daytime Peak
Average Low
12.7°C
Nighttime Low
Feels Like
23.7°C
☀️ Feels accurate
Rain Chance
21%
Avg 1mm if it rains
Cloud Cover
45%
Overcast
Pressure
1016.3 hPa
Medium volatility
Sofia Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 86% 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
🔴 25 min to burn
Type III-IV
🟡 38 min to burn
Type V-VI
🟢 63 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.1°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Bulgaria
Flight Traffic
High
88/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~84
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Sofia
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:09
☀️ Noon
12:22
🌇 Sunset
18:35
⏱️ Daylight
12h 26m
Wind Speed
9.8 km/h
Light breeze
Sunshine
9.5 hrs
Direct Sun (Cloud-free)
Humidity
64%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Sofia
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 Sofia
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
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Sofia on September 17 averages 23.3°C with a 21% precipitation probability. Wedding/Outdoor Event Score: 98/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Sofia Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 10
23.9°C • 12% rain
Score
100
September 11
24°C • 12% rain
Score
100
September 12
24.1°C • 12% rain
Score
100
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 17) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Sofia Worth Visiting on September 17?
Planning a trip to Sofia on September 17? 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 23.3°C with a 21% historical precipitation risk.
✈️ Travel Logistics: Approximately 84 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Bulgaria, including COVID-19.
📊 Historical Extremes: The hottest September 17 recorded in the last 30 years saw temperatures hit 32.9°C in 2017, while the coldest dropped to 9.3°C in 2024.