September 21 is generally a great time to visit Sapporo. While there is a slight chance of rain (30%), showers are usually brief. Expect comfortable 20°C weather. Sapporo is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Sapporo
Currency
JPY
¥ Japanese yen
Language
Japanese
Driving
Left side
Connect
Traveler SIM cards can be bought in BIC ...
Safety
Very High Safety
GPI: 1.336
Sapporo Weather Forecast for September 21
"Mild & Comfortable. Expect average highs of 20°C. 30% chance of rain."
What to Wear in Sapporo in September
Based on historical data for September 21, Sapporo typically experiences temperatures between 12.1°C and 20°C. We recommend packing light jacket, long pants, umbrella 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 Sapporo
Smart Suitcase
- Light Jacket
- Long Pants
- Umbrella
Average High
20°C
Daytime Peak
Average Low
12.1°C
Nighttime Low
Feels Like
20°C
☀️ Feels accurate
Rain Chance
30%
Avg 2.5mm if it rains
Cloud Cover
58%
Overcast
Pressure
1014 hPa
Medium volatility
Sapporo Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 96% 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
🔴 31 min to burn
Type III-IV
🟡 47 min to burn
Type V-VI
🟢 78 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°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 Japan
Flight Traffic
High
87/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~213
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Sapporo
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:21
☀️ Noon
11:29
🌇 Sunset
17:37
⏱️ Daylight
12h 16m
Wind Speed
19.3 km/h
Gentle breeze
Sunshine
8.3 hrs
Direct Sun (Cloud-free)
Humidity
78%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Sapporo
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Sapporo
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 excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Active seismic zone. Multiple earthquakes per year.
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Sapporo on September 21 averages 20°C with a 30% precipitation probability. Wedding/Outdoor Event Score: 93/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Sapporo Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
💡 Moving your event by a few days could significantly improve weather conditions
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📍 Is Sapporo Worth Visiting on September 21?
Planning a trip to Sapporo 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 20°C with a 30% historical precipitation risk.
✈️ Travel Logistics: Approximately 213 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 8 vaccinations are recommended for Japan, including COVID-19.
📊 Historical Extremes: The hottest September 21 recorded in the last 30 years saw temperatures hit 22.1°C in 2021, while the coldest dropped to 6.9°C in 2018.