September 17 is generally a great time to visit Osaka. While there is a slight chance of rain (33%), showers are usually brief. Expect comfortable 29°C weather. Osaka is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Osaka
Currency
JPY
¥ Japanese yen
Language
Japanese
Driving
Left side
Safety
Very High Safety
GPI: 1.336
Osaka Weather Forecast for September 17
"Warm & Sunny. Expect average highs of 28.7°C. 33% chance of rain."
What to Wear in Osaka in September
Based on historical data for September 17, Osaka typically experiences temperatures between 21.5°C and 28.7°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 33% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Osaka
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
28.7°C
Daytime Peak
Average Low
21.5°C
Nighttime Low
Feels Like
33.1°C
🔥 Feels warmer
Rain Chance
33%
Avg 3.1mm if it rains
Cloud Cover
58%
Overcast
Pressure
1012.1 hPa
Medium volatility
Osaka 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
🔴 28 min to burn
Type III-IV
🟡 42 min to burn
Type V-VI
🟢 70 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°C
Humid/Sticky
Heat Index
33.1°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
94/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~263
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Osaka
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:43
☀️ Noon
11:54
🌇 Sunset
18:05
⏱️ Daylight
12h 21m
Wind Speed
14.2 km/h
Gentle breeze
Sunshine
9.1 hrs
Direct Sun (Cloud-free)
Humidity
76%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Osaka
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Osaka
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.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Active seismic zone. Multiple earthquakes per year.
Typhoon Risk
Year-round risk present
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, Osaka on September 17 averages 28.7°C with a 33% precipitation probability. Wedding/Outdoor Event Score: 92/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Osaka Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 23
26.9°C • 26% rain
Score
96
September 24
26.8°C • 28% rain
Score
96
September 19
28.2°C • 29% rain
Score
95
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
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📍 Is Osaka Worth Visiting on September 17?
Planning a trip to Osaka 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 28.7°C with a 33% historical precipitation risk.
✈️ Travel Logistics: Approximately 263 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 8 vaccinations are recommended for Japan, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 29.6°C (hot soup). Wave conditions are generally lake-like with heights around 0.45m.
📊 Historical Extremes: The hottest September 17 recorded in the last 30 years saw temperatures hit 32.9°C in 2025, while the coldest dropped to 21°C in 2017.