September 17 is generally a great time to visit Hangzhou. While there is a slight chance of rain (34%), showers are usually brief. Expect comfortable 28°C weather. Hangzhou is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Hangzhou
Currency
CNY
¥ Chinese yuan
Language
Chinese
Driving
Right side
Safety
Moderate Safety
GPI: 2.01
Hangzhou Weather Forecast for September 17
"Warm & Sunny. Expect average highs of 28.4°C. 34% chance of rain."
What to Wear in Hangzhou in September
Based on historical data for September 17, Hangzhou typically experiences temperatures between 21.4°C and 28.4°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 Hangzhou
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
28.4°C
Daytime Peak
Average Low
21.4°C
Nighttime Low
Feels Like
33.3°C
🔥 Feels warmer
Rain Chance
34%
Avg 2.5mm if it rains
Cloud Cover
55%
Light drizzle
Pressure
1011.3 hPa
Low volatility
Hangzhou Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 86% 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 - 18:00
Type I-II
🔴 25 min to burn
Type III-IV
🟡 38 min to burn
Type V-VI
🟢 63 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
24.8°C
Humid/Sticky
Heat Index
33.3°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in China
Flight Traffic
High
93/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~435
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Hangzhou
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:45
☀️ Noon
11:55
🌇 Sunset
18:05
⏱️ Daylight
12h 19m
Wind Speed
14.9 km/h
Gentle breeze
Sunshine
8.0 hrs
Direct Sun (Cloud-free)
Humidity
81%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Hangzhou
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 Hangzhou
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Mild discomfort possible for arthritic conditions.
Moderate fish activity expected.
Unhealthy. Everyone should reduce outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Hangzhou on September 17 averages 28.4°C with a 34% precipitation probability. Wedding/Outdoor Event Score: 90/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Hangzhou Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 24
26.8°C • 18% rain
Score
98
September 23
26.6°C • 23% rain
Score
96
September 22
26.6°C • 29% rain
Score
94
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 17) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Hangzhou Worth Visiting on September 17?
Planning a trip to Hangzhou on September 17? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 28.4°C with a 34% historical precipitation risk.
✈️ Travel Logistics: Approximately 435 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 17 recorded in the last 30 years saw temperatures hit 34.8°C in 2025, while the coldest dropped to 18.6°C in 2020.