Sendai weather in September
September in Sendai: warm, rainy, with clean air — a great time to visit.
#6 of 12 months in Sendai · #604 of 897 destinations to visit in September · comfort 75/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
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Sendai climate normals — September
| Daytime high | 24°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 67°F | |
| Rainfall | 143 mm / 5.6 in | 🌧 rainy |
| Rainy days | 15 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 20°C / 68°F | |
| Sunshine | 7.6 h/day | |
| Daylight | 12.4 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Sendai in September — FAQ
- Is September a good time to visit Sendai?
- September in Sendai: warm, rainy, with clean air — a great time to visit. It ranks #6 of 12 months for Sendai on SeasonMap's comfort score (75/100).
- What is the weather like in Sendai in September?
- In September, Sendai averages a daily high of 24.3°C and a low of 19.2°C, with about 143 mm of rain over roughly 14.6 rainy days.
- What is the air quality in Sendai in September?
- Sendai has a mean US Air Quality Index of about 38 in September.