Japan Osaka Weather in August — Climate Guide
August in Osaka is Below Average
August is Below Average for Osaka.
August is Osaka's hottest month — daily highs 33-35°C / 91-95°F with humidity 70-80%. The 'feels like' temperature regularly hits 38-40°C / 100-104°F. Heat exhaustion and heatstroke are genuine risks; hospitals see daily admissions for heat-related illness.
Obon week (mid-August) is Japan's ancestor-honoring period. Domestic travel surges as people return to family hometowns; Osaka empties of locals while filling with returning families. Many small restaurants and shops close August 13-16. Trains and flights to Tokyo or rural Japan are 100% booked weeks ahead.
Travel score
Osaka August Weather Stats
Avg High
33.4°C
Avg Low
25.3°C
Rainy Days
7
113mm total
Sunshine
6.3h
Daily avg
Humidity
70%
Very humid
UV Index
10
Very high
Wind
8 km/h
Gusts 16
Sea Temp
27°C
Avg water temp
Crowds
Busy
At attractions
August Sunrise & Sunset
Air Quality
PM2.5
22 μg/m³
PM10
32 μg/m³
Status
Moderate
Feels-Like Temperature & Wind
Feels like
Daytime
38°C
Nighttime
26°C
Humidity and wind affect how the actual temperature feels.
Wind
8 km/h
Max gust 16 km/h
Activities Recommended for August
August Travel Pros & Cons
Pros
- Naniwa Yodogawa Fireworks (early August)
- USJ summer special events (water rides, parades)
- Long daylight + clear sunset evenings
Cons
- Brutal heat — 'feels like' regularly 38-40°C / 100-104°F
- Obon (Aug 13-16) closes many small businesses
- Hotel prices second peak after sakura season
August Events & Festivals
- Obon (mid-August) — Japan's ancestor festival; many businesses close Aug 13-16
- Sumiyoshi Matsuri (early August) — Sumiyoshi Taisha's biggest festival
- Naniwa Yodogawa Fireworks (early August)
- USJ summer special events (water rides, themed parades)
Osaka in August — Full Picture
August is Osaka's hottest month — daily highs 33-35°C / 91-95°F with humidity 70-80%. The 'feels like' temperature regularly hits 38-40°C / 100-104°F. Heat exhaustion and heatstroke are genuine risks; hospitals see daily admissions for heat-related illness.
Obon week (mid-August) is Japan's ancestor-honoring period. Domestic travel surges as people return to family hometowns; Osaka empties of locals while filling with returning families. Many small restaurants and shops close August 13-16. Trains and flights to Tokyo or rural Japan are 100% booked weeks ahead.
The Naniwa Yodogawa Fireworks (early August) over the Yodogawa River is one of Western Japan's largest fireworks displays — 10,000 fireworks, 700,000+ spectators. Sumiyoshi Matsuri at Sumiyoshi Taisha is the second of Osaka's three biggest festivals (after Tenjin Matsuri in July).
USJ runs summer water rides and themed parades that justify a visit despite heat. Indoor refuges: department store basements (depachika), Kuromon Market (covered), Umeda underground, aquarium. Most travelers visit Osaka in shorter bursts (4 hours outdoor + 2 hours AC indoor) rather than continuous outdoor exploration.
What to Wear & What to Pack
Coolest possible — light short sleeves, shorts/skirt, breathable footwear. Hat mandatory. Cooling sheets, electrolyte drinks (Pocari Sweat), and sunscreen are survival gear.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
19.4°C
10.7°C
9/mo
Summer (Jun·Jul·Aug)
Current30.9°C
23.1°C
10/mo
Autumn (Sep·Oct·Nov)
23.6°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 August Hotel Picks
Frequently Asked Questions
Is August a good time to visit Osaka?
Osaka in August is Below Average. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Osaka in August?
Osaka August averages a high of 33.4°C and a low of 25.3°C.
Does it rain much in Osaka in August?
Osaka August averages 113mm of rainfall over about 7 rainy days.
What should I wear in Osaka in August?
Coolest possible — light short sleeves, shorts/skirt, breathable footwear. Hat mandatory. Cooling sheets, electrolyte drinks (Pocari Sweat), and sunscreen are survival gear.
What time are sunrise and sunset in Osaka in August?
Osaka August sunrise is 05:18 and sunset is 18:48, with 13h 30m of daylight.
What's the air quality like in Osaka in August?
Osaka August air quality (AQI) averages 50, rated Good. PM2.5 averages 22μg/m³.
What activities are recommended in Osaka in August?
In August, Osaka is great for Naniwa Yodogawa Fireworks, Summer matsuri (festivals), USJ water rides.
Is August peak season in Osaka?
Osaka August crowds are busy and prices are peak. Advance reservations are strongly recommended.
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.