September 18 is generally a great time to visit Tokyo. While there is a slight chance of rain (37%), showers are usually brief. Expect comfortable 27°C weather. Expect a bustling atmosphere in Tokyo right now—this is when the city truly comes alive with visitors.
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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 September 18
"Warm & Sunny. Expect average highs of 27.1°C. 37% chance of rain."
What to Wear in Tokyo in September
Based on historical data for September 18, Tokyo typically experiences temperatures between 20.5°C and 27.1°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 37% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Tokyo
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
27.1°C
Daytime Peak
Average Low
20.5°C
Nighttime Low
Feels Like
30°C
🔥 Feels warmer
Rain Chance
37%
Avg 3.4mm if it rains
Cloud Cover
67%
Overcast
Pressure
1012.7 hPa
Medium volatility
Tokyo Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
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
23.3°C
Humid/Sticky
Heat Index
30°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Jellyfish Warning
High water temps may attract jellyfish swarms.
Swim Index
✅ Excellent Swimming Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Japan
Flight Traffic
High
99/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~968
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Tokyo
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:27
☀️ Noon
11:37
🌇 Sunset
17:47
⏱️ Daylight
12h 20m
Wind Speed
18.3 km/h
Gentle breeze
Sunshine
8.0 hrs
Direct Sun (Cloud-free)
Humidity
80%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Tokyo
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 Tokyo
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.
Mild discomfort possible for arthritic conditions.
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 September 18 averages 27.1°C with a 37% precipitation probability. Wedding/Outdoor Event Score: 87/100."
— 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
Better Alternatives Nearby
Consider these dates within ±7 days
September 11
28.2°C • 26% rain
Score
93
September 12
28.1°C • 25% rain
Score
93
September 13
27.8°C • 29% rain
Score
92
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 18) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Tokyo Worth Visiting on September 18?
Planning a trip to Tokyo on September 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 27.1°C with a 37% historical precipitation risk.
✈️ Travel Logistics: Approximately 968 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 28.3°C (tropical bath). Wave conditions are generally fun waves with heights around 0.73m.
📊 Historical Extremes: The hottest September 18 recorded in the last 30 years saw temperatures hit 35.2°C in 2024, while the coldest dropped to 18.3°C in 2015.