Hiroshima weather in September
September in Hiroshima: hot, soaked, with clean air — a good time to visit.
#10 of 12 months in Hiroshima · #499 of 604 destinations to visit in September · comfort 62/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Hiroshima climate normals — September
| Daytime high | 28°C / 82°F | 🥵 hot |
|---|---|---|
| Nighttime low | 22°C / 71°F | |
| Feels like (high) | 31°C / 88°F | |
| Rainfall | 172 mm / 6.8 in | ⛈ soaked |
| Rainy days | 15 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 12.4 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 43 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Hiroshima in September — FAQ
- Is September a good time to visit Hiroshima?
- September in Hiroshima: hot, soaked, with clean air — a good time to visit. It ranks #10 of 12 months for Hiroshima on SeasonMap's comfort score (62/100).
- What is the weather like in Hiroshima in September?
- In September, Hiroshima averages a daily high of 27.8°C and a low of 21.6°C, with about 171.9 mm of rain over roughly 14.8 rainy days.
- What is the air quality in Hiroshima in September?
- Hiroshima has a mean US Air Quality Index of about 43 in September.