September 23 is generally a great time to visit Ljubljana. While there is a slight chance of rain (31%), showers are usually brief. Expect comfortable 19°C weather. Expect a bustling atmosphere in Ljubljana right now—this is when the city truly comes alive with visitors. Note: September 23 is Slovenian Sports Day in Ljubljana, so expect special events, closures, and festive atmosphere.
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Essential Travel Info for Ljubljana
Currency
EUR
€ Euro
Language
Slovene
Driving
Right side
Connect
As of 2025, Ljubljana has excellent 5G a...
Safety
Very High Safety
GPI: 1.316
Ljubljana Weather Forecast for September 23
"Mild & Comfortable. Expect average highs of 18.9°C. 31% chance of rain."
What to Wear in Ljubljana in September
Based on historical data for September 23, Ljubljana typically experiences temperatures between 10°C and 18.9°C. We recommend packing light jacket, long pants, umbrella to stay comfortable. With a 31% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Ljubljana
Smart Suitcase
- Light Jacket
- Long Pants
- Umbrella
Average High
18.9°C
Daytime Peak
Average Low
10°C
Nighttime Low
Feels Like
18.9°C
🌤️ Feels accurate
Rain Chance
31%
Avg 2.8mm if it rains
Cloud Cover
59%
Overcast
Pressure
1017.6 hPa
Medium volatility
Ljubljana Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 96% 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
🔴 32 min to burn
Type III-IV
🟡 48 min to burn
Type V-VI
🟢 80 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
15.6°C
Pleasant
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Holiday
Slovenian Sports Day
Flight Traffic
High
81/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~26
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Ljubljana
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:50
☀️ Noon
11:55
🌇 Sunset
18:00
⏱️ Daylight
12h 9m
Wind Speed
10 km/h
Light breeze
Sunshine
8.1 hrs
Direct Sun (Cloud-free)
Humidity
81%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Ljubljana
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 Ljubljana
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
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.
Unhealthy for sensitive groups. Consider wearing a mask outdoors.
Regional Safety Profile
Seismic Activity
Moderate seismic activity. Occasional tremors possible.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Ljubljana on September 23 averages 18.9°C with a 31% precipitation probability. Wedding/Outdoor Event Score: 93/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Ljubljana Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 20
19.6°C • 24% rain
Score
97
September 21
19.5°C • 25% rain
Score
96
September 19
19.7°C • 29% rain
Score
95
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 23) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Ljubljana Worth Visiting on September 23?
Planning a trip to Ljubljana on September 23? 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 18.9°C with a 31% historical precipitation risk.
🎉 Local Event: The date coincides with Slovenian Sports Day, which may influence local business hours and event availability.
✈️ Travel Logistics: Approximately 26 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Slovenia, including COVID-19.
📊 Historical Extremes: The hottest September 23 recorded in the last 30 years saw temperatures hit 22.9°C in 2024, while the coldest dropped to 2.5°C in 2022.