September 21 is generally a great time to visit Xi'an. While there is a slight chance of rain (30%), showers are usually brief. Expect comfortable 24°C weather. Expect a bustling atmosphere in Xi'an right now—this is when the city truly comes alive with visitors.
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Essential Travel Info for Xi'an
Currency
CNY
¥ Chinese yuan
Language
Chinese
Driving
Right side
Connect
It's not very easy to make friends with ...
Safety
Moderate Safety
GPI: 2.01
Xi'an Weather Forecast for September 21
"Mild & Comfortable. Expect average highs of 23.9°C. 30% chance of rain."
What to Wear in Xi'an in September
Based on historical data for September 21, Xi'an typically experiences temperatures between 15.5°C and 23.9°C. We recommend packing t-shirt, light clothing to stay comfortable. With a 30% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Xi'an
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
23.9°C
Daytime Peak
Average Low
15.5°C
Nighttime Low
Feels Like
24.5°C
☀️ Feels accurate
Rain Chance
30%
Avg 2.5mm if it rains
Cloud Cover
58%
Overcast
Pressure
1015.3 hPa
Medium volatility
Xi'an Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 80% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
06:00 - 10:00
16:00 - 18:00
Type I-II
🔴 26 min to burn
Type III-IV
🟡 39 min to burn
Type V-VI
🟢 65 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
19°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 China
Flight Traffic
High
95/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~500
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Xi'an
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:32
☀️ Noon
12:38
🌇 Sunset
18:45
⏱️ Daylight
12h 12m
Wind Speed
9.2 km/h
Light breeze
Sunshine
6.9 hrs
Direct Sun (Cloud-free)
Humidity
74%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Xi'an
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 Xi'an
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. Everyone should reduce outdoor activities.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Xi'an on September 21 averages 23.9°C with a 30% precipitation probability. Wedding/Outdoor Event Score: 96/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Xi'an Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 14
26.5°C • 24% rain
Score
97
September 22
23.9°C • 26% rain
Score
97
September 23
23.7°C • 27% rain
Score
97
💡 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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🌍 Explore the same date in different destinations around the world
📍 Is Xi'an Worth Visiting on September 21?
Planning a trip to Xi'an 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 23.9°C with a 30% historical precipitation risk.
✈️ Travel Logistics: Approximately 500 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 10 vaccinations are recommended for China, including COVID-19.
📊 Historical Extremes: The hottest September 21 recorded in the last 30 years saw temperatures hit 29.5°C in 2021, while the coldest dropped to 12.5°C in 2016.