Japan Hiroshima Weather in September — Climate Guide
September in Hiroshima is moderate
Hiroshima Weather in September — Quick Answer
As of 2026- Avg temp
- 29° / 20°
- Rainfall
- 200mm · 10 days
- Crowds
- Moderate
As of 2026, Hiroshima in September averages a high of 29°C and low of 20°C with 200mm of rain over about 10 days. Still hot + typhoon. T-shirt + raincoat.
September is moderate for Hiroshima.
Typhoon season peak — variable weather. Equinox holiday brings reduced crowds elsewhere. Shoulder pricing.
Travel score
Hiroshima September Weather Stats
Avg High
29°C
Avg Low
20°C
Rainy Days
10
200mm total
Sunshine
6h
Daily avg
Humidity
75%
high
UV Index
6
High
Wind
8 km/h
Gusts 25
Sea Temp
25°C
swimming
Crowds
Moderate
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
16 μg/m³
PM10
26 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
31°C
Nighttime
21°C
Humidity and wind affect how the actual temperature feels.
Wind
8 km/h
Max gust 25 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- 29°C still warm
- Reduced crowds
- Shoulder pricing
Cons
- 200mm rain
- Typhoon risk peak
- Variable weather
September Events & Festivals
- Typhoon season peak
- Equinox holiday (Sept 22-23)
Hiroshima in September — Full Picture
Typhoon season peak — variable weather. Equinox holiday brings reduced crowds elsewhere. Shoulder pricing.
What to Wear & What to Pack
Still hot + typhoon. T-shirt + raincoat.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
18.7°C
9.7°C
10/mo
Summer (Jun·Jul·Aug)
30.3°C
22.3°C
10.7/mo
Autumn (Sep·Oct·Nov)
Current23°C
14°C
7.3/mo
Winter (Dec·Jan·Feb)
11°C
2.7°C
6.7/mo
Hiroshima Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 10° | 2° | 7d·50mm | 5h | 65% | 2 | Quiet | Low season | |
| 11° | 2° | 7d·60mm | 6h | 65% | 3 | Quiet | Low season | |
| March (Best) | 14° | 5° | 10d·110mm | 7h | 65% | 4 | Very busy | Peak |
| April (Best) | 19° | 10° | 10d·130mm | 8h | 65% | 6 | Very busy | Peak |
| 23° | 14° | 10d·130mm | 8h | 70% | 7 | Very busy | Peak | |
| 27° | 19° | 13d·230mm | 5h | 75% | 7 | Moderate | Shoulder | |
| 31° | 24° | 11d·250mm | 6h | 75% | 9 | Busy | Peak | |
| 33° | 24° | 8d·130mm | 8h | 73% | 10 | Very busy | Peak | |
| 29° | 20° | 10d·200mm | 6h | 75% | 6 | Moderate | Shoulder | |
| October (Best) | 23° | 14° | 6d·100mm | 7h | 70% | 5 | Busy | Peak |
| November (Best) | 17° | 8° | 6d·80mm | 5h | 65% | 3 | Busy | Peak |
| 12° | 4° | 6d·50mm | 5h | 65% | 2 | Moderate | Shoulder |
View Other Months
Hiroshima September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Hiroshima?
Hiroshima in September is moderate. Tourist crowds are moderate and flight/hotel prices are shoulder.
What's the average temperature in Hiroshima in September?
Hiroshima September averages a high of 29°C and a low of 20°C.
Does it rain much in Hiroshima in September?
Hiroshima September averages 200mm of rainfall over about 10 rainy days.
What should I wear in Hiroshima in September?
Still hot + typhoon. T-shirt + raincoat.
What time are sunrise and sunset in Hiroshima in September?
Hiroshima September sunrise is 06:05 and sunset is 18:10, with 12h 5min of daylight.
What's the air quality like in Hiroshima in September?
Hiroshima September air quality (AQI) averages 45, rated Good. PM2.5 averages 16μg/m³.
What activities are recommended in Hiroshima in September?
In September, Hiroshima is great for Indoor Peace Park, Miyajima between typhoons, Mt. Misen.
Is September peak season in Hiroshima?
Hiroshima September crowds are moderate and prices are shoulder. You can travel relatively comfortably without long queues.
Best Months to Visit Hiroshima
View Other Months
Planning a September trip to Hiroshima?
You've checked the weather — next come the budget and the route.
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.