October 21 is generally a great time to visit Tokyo. While there is a slight chance of rain (28%), showers are usually brief. Expect comfortable 20°C weather. Tokyo is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Tokyo
Currency
JPY
¥ Japanese yen
Language
Japanese
Driving
Left side
Connect
Getting a SIM card in Japan requires jum...
Safety
Very High Safety
GPI: 1.336
Tokyo Weather Forecast for October 21
"Mild & Comfortable. Expect average highs of 20.1°C. 28% chance of rain."
What to Wear in Tokyo in October
Based on historical data for October 21, Tokyo typically experiences temperatures between 12.7°C and 20.1°C. We recommend packing light jacket, long pants to stay comfortable. With a 28% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Tokyo
Smart Suitcase
- Light Jacket
- Long Pants
Average High
20.1°C
Daytime Peak
Average Low
12.7°C
Nighttime Low
Feels Like
20.1°C
☀️ Feels accurate
Rain Chance
28%
Avg 3.3mm if it rains
Cloud Cover
60%
Overcast
Pressure
1018.2 hPa
Medium volatility
Tokyo Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 100% 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
🔴 57 min to burn
Type III-IV
🟡 86 min to burn
Type V-VI
🟢 143 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.1°C
Noticeable
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
✅ Excellent Swimming Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Japan
Flight Traffic
High
100/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~972
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Tokyo
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:53
☀️ Noon
11:27
🌇 Sunset
17:00
⏱️ Daylight
11h 7m
Wind Speed
18.2 km/h
Gentle breeze
Sunshine
7.0 hrs
Direct Sun (Cloud-free)
Humidity
78%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Tokyo
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Tokyo
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
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
Very high seismic risk. Ring of Fire territory.
Typhoon Risk
Year-round risk present
Volcanic Activity
Nearest: Mount Fuji
90.6km away
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, Tokyo on October 21 averages 20.1°C with a 28% precipitation probability. Wedding/Outdoor Event Score: 94/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Tokyo Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (October 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Tokyo Worth Visiting on October 21?
Planning a trip to Tokyo on October 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 20.1°C with a 28% historical precipitation risk.
✈️ Travel Logistics: Approximately 972 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 8 vaccinations are recommended for Japan, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 21.4°C (swimming pool). Wave conditions are generally fun waves with heights around 0.58m.
📊 Historical Extremes: The hottest October 21 recorded in the last 30 years saw temperatures hit 21.6°C in 2023, while the coldest dropped to 8.5°C in 2022.