September 21 is generally a great time to visit Lyon. While there is a slight chance of rain (25%), showers are usually brief. Expect comfortable 22°C weather. Lyon is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Lyon
Currency
EUR
€ Euro
Language
French
Driving
Right side
Connect
Lyon has 5G from all French carriers. Wi...
Safety
High Safety
GPI: 1.895
Lyon Weather Forecast for September 21
"Mild & Comfortable. Expect average highs of 21.8°C. 25% chance of rain."
What to Wear in Lyon in September
Based on historical data for September 21, Lyon typically experiences temperatures between 12.2°C and 21.8°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (25% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Lyon
Smart Suitcase
- Light Jacket
- Long Pants
Average High
21.8°C
Daytime Peak
Average Low
12.2°C
Nighttime Low
Feels Like
22.1°C
☀️ Feels accurate
Rain Chance
25%
Avg 1.7mm if it rains
Cloud Cover
52%
Overcast
Pressure
1017.3 hPa
Medium volatility
Lyon Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 87% 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
🔴 30 min to burn
Type III-IV
🟡 45 min to burn
Type V-VI
🟢 75 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.5°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in France
Flight Traffic
High
100/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~247
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Lyon
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:27
☀️ Noon
12:35
🌇 Sunset
18:43
⏱️ Daylight
12h 15m
Wind Speed
14.2 km/h
Gentle breeze
Sunshine
9.0 hrs
Direct Sun (Cloud-free)
Humidity
72%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Lyon
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Lyon
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, Lyon on September 21 averages 21.8°C with a 25% precipitation probability. Wedding/Outdoor Event Score: 97/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Lyon Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 16
22.6°C • 18% rain
Score
99
September 14
23.2°C • 23% rain
Score
98
September 15
22.8°C • 21% 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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Rome
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United Kingdom
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🌍 Explore the same date in different destinations around the world
📍 Is Lyon Worth Visiting on September 21?
Planning a trip to Lyon 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 21.8°C with a 25% historical precipitation risk.
✈️ Travel Logistics: Approximately 247 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for France, including COVID-19.
📊 Historical Extremes: The hottest September 21 recorded in the last 30 years saw temperatures hit 30.3°C in 2018, while the coldest dropped to 8.3°C in 2017.