September 23 sees frequent showers in Nikko. Historical data shows a 53% chance of rain, so pack accordingly. Temperatures average 22°C. Nikko is currently in its most popular travel window, meaning vibrant crowds and premium pricing. Note: September 23 is Autumnal Equinox Day in Nikko, so expect special events, closures, and festive atmosphere.
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Essential Travel Info for Nikko
Currency
JPY
¥ Japanese yen
Language
Japanese
Driving
Left side
Safety
Very High Safety
GPI: 1.336
Nikko Weather Forecast for September 23
"Rainy & Overcast. Expect average highs of 22.1°C. 53% chance of rain."
What to Wear in Nikko in September
Based on historical data for September 23, Nikko typically experiences temperatures between 15.5°C and 22.1°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 53% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Nikko
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
22.1°C
Daytime Peak
Average Low
15.5°C
Nighttime Low
Feels Like
22.5°C
☀️ Feels accurate
Rain Chance
53%
Avg 7.3mm if it rains
Cloud Cover
74%
Moderate rain
Pressure
1015.8 hPa
Medium volatility
Nikko Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 82% 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
🔴 33 min to burn
Type III-IV
🟡 50 min to burn
Type V-VI
🟢 83 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
19.3°C
Noticeable
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Holiday
Autumnal Equinox Day
Flight Traffic
High
98/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~968
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Nikko
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:30
☀️ Noon
11:35
🌇 Sunset
17:39
⏱️ Daylight
12h 9m
Wind Speed
8.5 km/h
Light breeze
Sunshine
6.6 hrs
Direct Sun (Cloud-free)
Humidity
84%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Nikko
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Nikko
Travel Comfort Index
Real-time tourism conditions
Weather Quality
🌧️ Variable
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
Very high seismic risk. Ring of Fire territory.
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, Nikko on September 23 averages 22.1°C with a 53% precipitation probability. Wedding/Outdoor Event Score: 81/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Nikko Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 30
21.7°C • 42% rain
Score
88
September 29
21.5°C • 44% rain
Score
87
September 27
21.8°C • 45% rain
Score
86
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 23) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Nikko Worth Visiting on September 23?
Planning a trip to Nikko on September 23? 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 22.1°C with a 53% historical precipitation risk.
🎉 Local Event: The date coincides with Autumnal Equinox Day, which may influence local business hours and event availability.
✈️ 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.
📊 Historical Extremes: The hottest September 23 recorded in the last 30 years saw temperatures hit 26.8°C in 2019, while the coldest dropped to 13.7°C in 2025.