Osaka weather in September
September in Osaka: hot, rainy, with very humid — a good time to visit.
#9 of 12 months in Osaka · #453 of 604 destinations to visit in September · comfort 67/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Osaka climate normals — September
| Daytime high | 29°C / 84°F | 🥵 hot |
|---|---|---|
| Nighttime low | 22°C / 71°F | |
| Feels like (high) | 32°C / 90°F | |
| Rainfall | 128 mm / 5 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 8.7 h/day | |
| Daylight | 12.4 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 65 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Osaka in September — FAQ
- Is September a good time to visit Osaka?
- September in Osaka: hot, rainy, with very humid — a good time to visit. It ranks #9 of 12 months for Osaka on SeasonMap's comfort score (67/100).
- What is the weather like in Osaka in September?
- In September, Osaka averages a daily high of 28.7°C and a low of 21.9°C, with about 127.5 mm of rain over roughly 11.8 rainy days.
- What is the air quality in Osaka in September?
- Osaka has a mean US Air Quality Index of about 65 in September.