Japan Osaka Weather in September — Climate Guide
September in Osaka is Good
September is Good for Osaka.
September is the typhoon season peak in Western Japan. Direct hits on Osaka are rare but train suspensions and flight cancellations happen 1-2 times per month. Buy refundable airline tickets and check NHK World news daily during your trip.
Temperatures begin cooling — daily highs drop from 31°C / 88°F early September to 27°C / 80°F by month's end. Humidity stays high (70-75%) until the autumn weather pattern sets in mid-month. Late September days are genuinely pleasant for outdoor activities.
Travel score
Osaka September Weather Stats
Avg High
29.5°C
Avg Low
22°C
Rainy Days
9
153mm total
Sunshine
6.2h
Daily avg
Humidity
71%
Humid
UV Index
7
High
Wind
9 km/h
Gusts 18
Sea Temp
26°C
Avg water temp
Crowds
Moderate
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
19 μg/m³
PM10
28 μg/m³
Status
Moderate
Feels-Like Temperature & Wind
Feels like
Daytime
32°C
Nighttime
23°C
Humidity and wind affect how the actual temperature feels.
Wind
9 km/h
Max gust 18 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Late September weather genuinely improves
- Kishiwada Danjiri Matsuri — spectacular and unique
- Hotel prices reasonable mid-month
Cons
- Typhoon season — flight risk real
- Silver Week (mid-September) sees 30-50% rate spikes
- Humidity stays high until late month
September Events & Festivals
- Typhoon season peaks — flight cancellations possible
- Kishiwada Danjiri Matsuri (mid-September) — kamikaze cart-pulling festival
- Silver Week (varies — late September) — 5-day domestic holiday
Osaka in September — Full Picture
September is the typhoon season peak in Western Japan. Direct hits on Osaka are rare but train suspensions and flight cancellations happen 1-2 times per month. Buy refundable airline tickets and check NHK World news daily during your trip.
Temperatures begin cooling — daily highs drop from 31°C / 88°F early September to 27°C / 80°F by month's end. Humidity stays high (70-75%) until the autumn weather pattern sets in mid-month. Late September days are genuinely pleasant for outdoor activities.
Kishiwada Danjiri Matsuri (mid-September) in nearby Kishiwada is one of Japan's most spectacular festivals — 5-meter-tall wooden carts pulled at full speed through narrow streets by hundreds of locals, with riders dancing on top. It's chaotic, dangerous, and unforgettable. Train from Osaka to Kishiwada is 30 minutes.
Silver Week (around September 19-23 most years, dates vary) is Japan's second domestic travel surge after Golden Week. Hotels spike 30-50%, USJ fills up. Mid-September outside Silver Week is one of the better-value windows of the year.
What to Wear & What to Pack
Short sleeves, lightweight pants. Late September starts cooling — bring a light cardigan for evenings. Folding umbrella for typhoon-season showers.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
19.4°C
10.7°C
9/mo
Summer (Jun·Jul·Aug)
30.9°C
23.1°C
10/mo
Autumn (Sep·Oct·Nov)
Current23.6°C
15.9°C
7.7/mo
Winter (Dec·Jan·Feb)
10.7°C
3.6°C
5.3/mo
Osaka Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 9.5° | 2.8° | 5d·47mm | 5.5h | 60% | 2 | Quiet | Low season | |
| 10.4° | 2.9° | 6d·60mm | 6.1h | 60% | 3 | Quiet | Low season | |
| March (Best) | 13.7° | 5.7° | 9d·104mm | 6.4h | 62% | 4 | Busy | Peak |
| April (Best) | 19.9° | 10.7° | 9d·103mm | 6.5h | 64% | 6 | Very busy | Peak |
| May (Best) | 24.5° | 15.6° | 9d·134mm | 6.7h | 67% | 8 | Busy | Peak |
| 27.8° | 19.9° | 12d·187mm | 4.7h | 72% | 9 | Moderate | Shoulder | |
| 31.6° | 24° | 11d·174mm | 5.5h | 73% | 10 | Moderate | Shoulder | |
| 33.4° | 25.3° | 7d·113mm | 6.3h | 70% | 10 | Busy | Peak | |
| 29.5° | 22° | 9d·153mm | 6.2h | 71% | 7 | Moderate | Shoulder | |
| October (Best) | 23.7° | 16° | 8d·130mm | 5.9h | 67% | 5 | Busy | Peak |
| November (Best) | 17.6° | 9.7° | 6d·73mm | 5.8h | 64% | 3 | Busy | Peak |
| 12.3° | 5° | 5d·49mm | 5.7h | 60% | 2 | Busy | Peak |
View Other Months
Osaka September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Osaka?
Osaka in September is Good. Tourist crowds are moderate and flight/hotel prices are shoulder.
What's the average temperature in Osaka in September?
Osaka September averages a high of 29.5°C and a low of 22°C.
Does it rain much in Osaka in September?
Osaka September averages 153mm of rainfall over about 9 rainy days.
What should I wear in Osaka in September?
Short sleeves, lightweight pants. Late September starts cooling — bring a light cardigan for evenings. Folding umbrella for typhoon-season showers.
What time are sunrise and sunset in Osaka in September?
Osaka September sunrise is 05:43 and sunset is 18:09, with 12h 26m of daylight.
What's the air quality like in Osaka in September?
Osaka September air quality (AQI) averages 45, rated Good. PM2.5 averages 19μg/m³.
What activities are recommended in Osaka in September?
In September, Osaka is great for Kishiwada Danjiri Matsuri, Late-month outdoor walks, Mt. Rokko cable car.
Is September peak season in Osaka?
Osaka September crowds are moderate and prices are shoulder. You can travel relatively comfortably without long queues.
Best Months to Visit Osaka
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.