May 9 sees frequent showers in Basel. Historical data shows a 41% chance of rain, so pack accordingly. Temperatures average 19°C. Take advantage of the off-peak calm in Basel to see the sights without the usual crowds.
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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 May 9
"Mild & Comfortable. Expect average highs of 18.8°C. 41% chance of rain."
What to Wear in Basel in May
Based on historical data for May 9, Basel typically experiences temperatures between 8.7°C and 18.8°C. We recommend packing light jacket, long pants, umbrella to stay comfortable. With a 41% 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
18.8°C
Daytime Peak
Average Low
8.7°C
Nighttime Low
Feels Like
18.8°C
🌤️ Feels accurate
Rain Chance
41%
Avg 2.6mm if it rains
Cloud Cover
67%
Overcast
Pressure
1015.2 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 77% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 19:00
Type I-II
🔴 20 min to burn
Type III-IV
🟡 30 min to burn
Type V-VI
🟢 50 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
14.3°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 Switzerland
Flight Traffic
Quiet
22/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~39
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Basel
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:02
☀️ Noon
12:27
🌇 Sunset
19:52
⏱️ Daylight
14h 50m
Wind Speed
11.2 km/h
Light breeze
Sunshine
9.6 hrs
Direct Sun (Cloud-free)
Humidity
75%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Basel
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 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 May 9 averages 18.8°C with a 41% precipitation probability. Wedding/Outdoor Event Score: 84/100."
— 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
May 11
19.1°C • 37% rain
Score
87
May 10
19.1°C • 40% rain
Score
86
May 12
18.9°C • 39% rain
Score
86
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 9) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Basel Worth Visiting on May 9?
Planning a trip to Basel on May 9? 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 18.8°C with a 41% historical precipitation risk.
✈️ Travel Logistics: Approximately 39 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 May 9 recorded in the last 30 years saw temperatures hit 25.6°C in 2021, while the coldest dropped to 6.1°C in 2025.