Yokohama weather in September
September in Yokohama: warm, soaked, with very humid — fine if you can take 13 rainy days.
#11 of 12 months in Yokohama · #704 of 897 destinations to visit in September · comfort 68/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Yokohama in September
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Yokohama climate normals — September
| Daytime high | 26°C / 79°F | 🌤 warm |
|---|---|---|
| Nighttime low | 22°C / 71°F | |
| Rainfall | 155 mm / 6.1 in | ⛈ soaked |
| Rainy days | 13 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 8.1 h/day | |
| Daylight | 12.4 h | |
| Wind | 24 km/h / 15 mph | |
| Air quality (US AQI) | 68 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Yokohama in September — FAQ
- Is September a good time to visit Yokohama?
- September in Yokohama: warm, soaked, with very humid — fine if you can take 13 rainy days. It ranks #11 of 12 months for Yokohama on SeasonMap's comfort score (68/100).
- What is the weather like in Yokohama in September?
- In September, Yokohama averages a daily high of 26°C and a low of 21.8°C, with about 154.6 mm of rain over roughly 12.6 rainy days.
- What is the air quality in Yokohama in September?
- Yokohama has a mean US Air Quality Index of about 68 in September.