August 18 is generally a great time to visit Basel. While there is a slight chance of rain (34%), showers are usually brief. Expect comfortable 26°C weather. Expect a bustling atmosphere in Basel right now—this is when the city truly comes alive with visitors.
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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 August 18
"Warm & Sunny. Expect average highs of 25.6°C. 34% chance of rain."
What to Wear in Basel in August
Based on historical data for August 18, Basel typically experiences temperatures between 15.7°C and 25.6°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 34% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Basel
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
25.6°C
Daytime Peak
Average Low
15.7°C
Nighttime Low
Feels Like
26.5°C
☀️ Feels accurate
Rain Chance
34%
Avg 2.5mm if it rains
Cloud Cover
56%
Overcast
Pressure
1016.2 hPa
Low volatility
Basel Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 19:00
Type I-II
🔴 21 min to burn
Type III-IV
🟡 32 min to burn
Type V-VI
🟢 53 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
20.2°C
Humid/Sticky
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Morning hours (before 11 AM)
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Switzerland
Flight Traffic
High
100/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~181
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Basel
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:30
☀️ Noon
12:35
🌇 Sunset
19:39
⏱️ Daylight
14h 9m
Wind Speed
9.4 km/h
Light breeze
Sunshine
10.6 hrs
Direct Sun (Cloud-free)
Humidity
72%
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
🔴 Very Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
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 August 18 averages 25.6°C with a 34% precipitation probability. Wedding/Outdoor Event Score: 93/100."
— 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
August 11
26.2°C • 25% rain
Score
97
August 12
26.2°C • 26% rain
Score
97
August 13
26.2°C • 29% rain
Score
96
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (August 18) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Basel Worth Visiting on August 18?
Planning a trip to Basel on August 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 25.6°C with a 34% historical precipitation risk.
✈️ Travel Logistics: Approximately 181 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 August 18 recorded in the last 30 years saw temperatures hit 34°C in 2023, while the coldest dropped to 13.6°C in 2025.