The month in detail
What to expect in September
Autumn in Osaka is often underrated: 29°C, golden light and declining crowds. An interesting window. Expect rain on 36% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if May (8.0/10) remains theoretically better.
September ranks 2 out of 12 months in Osaka. Compared to August: −4°C daytime, 6 pts more rainy days, −1.8h of sun per day.
This month's conditions
What it's like in September
UV index
6 · high
sunscreen and hat advised
Feels like
muggy at times
20°
Sea
29°C
warm, ideal
Daylight
12.2h of daylight
Air quality
fair
AQI 44
Compare
Is September the right month?
The best month in Osaka is May (8.0/10), 0.1 pt higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Osaka
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Osaka
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach holiday.
Country · Japan
🗣️LanguageJapanese
💶CurrencyYen japonais (¥)
🚗DrivingLeft-hand
🛡️Safety ⓘSafe · 2/5
💰Cost of living ⓘModerate · 3/5
🌡️ Climate
🌍Climate typeTemperate oceanic
📈Climate trend ⓘ+1.45°C/decade
🔥Hottest monthAugust · 33°C
❄️Coolest monthJanuary · 9°C
🌧️Rainiest month ⓘJuly · 38%
🏖️ Beach holiday
📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) ⓘModérée
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Osaka ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
JapanTemperate oceanic climate with a 8.0 → 4.2 gap between best and worst month. 10 years of ERA5 data to choose by project.
34.69°N · 135.50°E
Questions
Frequently asked questions
What is the best time to visit Osaka?
May is the best month with 23.0°C highs, 15.0°C lows, 6.6h of sunshine and 29.0% rainy days. The months of May & June offer comparable conditions.
How many hours of sunshine does Osaka get in May?
Osaka averages 6.6 sunshine hours per day in May. It is the sunniest month with a climate score of 7.4/10.
What is the rainiest month in Osaka?
January is the most unfavourable month with January has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Osaka in May?
In May, overnight lows reach 15.0°C, while afternoon highs average 23.0°C.
Is Osaka good in winter?
In winter (December-February), Osaka scores 4.1/10 on average — Difficult period — prefer the peak season.. The best month overall remains May with a score of 7.4/10.
When should you avoid Osaka?
January is the most difficult month to visit Osaka, with January has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Osaka in September?
In September, the sea averages 29°C in Osaka: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Osaka in September?
The average UV index reaches 6 in September in Osaka (high), with about 12.2h of daylight. Sunscreen and hat advised.