The month in detail
What to expect in September
Autumn in Hiroshima is often underrated: 28°C, golden light and declining crowds. An interesting window. Expect rain on 34% of days — a light raincoat in the bag is recommended.
September is the best month of the year in Hiroshima. Compared to August: −3°C daytime, −1.1h 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
28°C
warm, ideal
Daylight
12.2h of daylight
Air quality
good
AQI 30
Compare
Is September the right month?
September is actually the best month of the year in Hiroshima. Good timing.
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 · Hiroshima
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Hiroshima
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 ⓘStable
🔥Hottest monthAugust · 31°C
❄️Coolest monthJanuary · 9°C
🌧️Rainiest month ⓘJuly · 36%
🏖️ 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 Hiroshima ?
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.
34.40°N · 132.46°E
Questions
Frequently asked questions
What is the best time to visit Hiroshima?
September is the best month with 28.0°C highs, 21.0°C lows, 5.6h of sunshine and 34.0% rainy days. The months of September & May offer comparable conditions.
How many hours of sunshine does Hiroshima get in September?
Hiroshima averages 5.6 sunshine hours per day in September. It is the sunniest month with a climate score of 7.6/10.
What is the rainiest month in Hiroshima?
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 Hiroshima in September?
In September, overnight lows reach 21.0°C, while afternoon highs average 28.0°C.
Is Hiroshima good in winter?
In winter (December-February), Hiroshima scores 4.1/10 on average — Difficult period — prefer the peak season.. The best month overall remains September with a score of 7.6/10.
When should you avoid Hiroshima?
January is the most difficult month to visit Hiroshima, 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 Hiroshima in September?
In September, the sea averages 28°C in Hiroshima: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Hiroshima in September?
The average UV index reaches 6 in September in Hiroshima (high), with about 12.2h of daylight. Sunscreen and hat advised.