September 21 is generally a great time to visit Bratislava. While there is a slight chance of rain (20%), showers are usually brief. Expect comfortable 20°C weather. It's a quieter period for Bratislava, ideal for those who prefer unhurried sightseeing.
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Essential Travel Info for Bratislava
Currency
EUR
€ Euro
Language
Slovak
Driving
Right side
Connect
As of Sept 2021, Bratislava has 4G from ...
Safety
Very High Safety
GPI: 1.499
Bratislava Weather Forecast for September 21
"Mild & Comfortable. Expect average highs of 19.7°C. 20% chance of rain."
What to Wear in Bratislava in September
Based on historical data for September 21, Bratislava typically experiences temperatures between 11°C and 19.7°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (20% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Bratislava
Smart Suitcase
- Light Jacket
- Long Pants
Average High
19.7°C
Daytime Peak
Average Low
11°C
Nighttime Low
Feels Like
19.7°C
🌤️ Feels accurate
Rain Chance
20%
Avg 0.9mm if it rains
Cloud Cover
53%
Overcast
Pressure
1017.9 hPa
Medium volatility
Bratislava Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ This date historically delivers consistent weather 75% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 31 min to burn
Type III-IV
🟡 47 min to burn
Type V-VI
🟢 78 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
14.5°C
Pleasant
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Slovakia
Flight Traffic
Quiet
23/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~9
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Bratislava
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:37
☀️ Noon
11:46
🌇 Sunset
17:54
⏱️ Daylight
12h 17m
Wind Speed
17.1 km/h
Gentle breeze
Sunshine
8.2 hrs
Direct Sun (Cloud-free)
Humidity
72%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Bratislava
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Bratislava
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, Bratislava on September 21 averages 19.7°C with a 20% precipitation probability. Wedding/Outdoor Event Score: 97/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Bratislava Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 28
18.5°C • 14% rain
Score
100
September 19
20.1°C • 19% rain
Score
98
September 20
19.9°C • 17% rain
Score
98
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 21) in other destinations
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🌍 Explore the same date in different destinations around the world
📍 Is Bratislava Worth Visiting on September 21?
Planning a trip to Bratislava on September 21? 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 19.7°C with a 20% historical precipitation risk.
✈️ Travel Logistics: Approximately 9 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Slovakia, including COVID-19.
📊 Historical Extremes: The hottest September 21 recorded in the last 30 years saw temperatures hit 28.1°C in 2025, while the coldest dropped to 6.4°C in 2019.