September 11 is generally a great time to visit Basel. While there is a slight chance of rain (31%), showers are usually brief. Expect comfortable 22°C weather. Basel is currently in its most popular travel window, meaning vibrant crowds and premium pricing. Note: September 11 is Geneva Prayday in Basel, so expect special events, closures, and festive atmosphere.
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Essential Travel Info for Basel
Currency
CHF
Fr. Swiss franc
Language
French
+3 more
Driving
Right side
Connect
As of Sept 2021, Basel has 4G from Salt,...
Safety
Very High Safety
GPI: 1.357
Basel Weather Forecast for September 11
"Mild & Comfortable. Expect average highs of 22°C. 31% chance of rain."
What to Wear in Basel in September
Based on historical data for September 11, Basel typically experiences temperatures between 12.2°C and 22°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 Basel
Smart Suitcase
- Light Jacket
- Long Pants
- Umbrella
Average High
22°C
Daytime Peak
Average Low
12.2°C
Nighttime Low
Feels Like
22.3°C
☀️ Feels accurate
Rain Chance
31%
Avg 2.1mm if it rains
Cloud Cover
53%
Light drizzle
Pressure
1017.2 hPa
Medium volatility
Basel Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ This date historically delivers consistent weather 76% 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
17.1°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Holiday
Geneva Prayday
Flight Traffic
High
96/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~173
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Basel
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:02
☀️ Noon
12:27
🌇 Sunset
18:53
⏱️ Daylight
12h 50m
Wind Speed
11.2 km/h
Light breeze
Sunshine
9.3 hrs
Direct Sun (Cloud-free)
Humidity
74%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Basel
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Basel
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.
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, Basel on September 11 averages 22°C with a 31% precipitation probability. Wedding/Outdoor Event Score: 95/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Basel Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 4
22.8°C • 26% rain
Score
97
September 5
22.9°C • 27% rain
Score
97
September 9
22.3°C • 26% rain
Score
97
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 11) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Basel Worth Visiting on September 11?
Planning a trip to Basel on September 11? 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 22°C with a 31% historical precipitation risk.
🎉 Local Event: The date coincides with Geneva Prayday, which may influence local business hours and event availability.
✈️ Travel Logistics: Approximately 173 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Switzerland, including COVID-19.
📊 Historical Extremes: The hottest September 11 recorded in the last 30 years saw temperatures hit 30.5°C in 2023, while the coldest dropped to 8.1°C in 2019.