Yokohama weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: April – November
What is the weather like in Yokohama in September?
In September, Yokohama is warm: daytime highs average 26 °C, and even at night it stays warm at around 21 °C. The sea averages 25.1 °C – pleasant for swimming. Expect around 4 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 165 mm in total. The air is often humid and muggy. All in all, September is a good month for a holiday in Yokohama.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 63 | 64 | 65 |
| Day | 29° | 26° | 21° |
| Night | 24° | 21° | 15° |
| Sea | 26° | 25° | 22° |
| Sun | 6 h | 4 h | 4 h |
| Rain days | 11 | 13 | 13 |
More details for September
- Daylight
- 12 h 27 min05:23 – 17:50
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 21 daysdew point 18 °C or moreAll months
- Wind
- 24 km/haverage daily peakAll months
- Cloud cover
- 65 %on averageAll months
- Hot days
- 1 day30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %22 %
- Few rainy daysweight 30 %33 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Yokohama in September: quick answers
Is Yokohama hot in September?
Warm rather than hot: in September, daytime highs in Yokohama average 26 °C and nights cool to about 21 °C. On about 1 days the thermometer climbs to 30 °C or more.
Can you swim in Yokohama in September?
Yes. In September the sea averages 25.1 °C – pleasant for swimming.
Does it rain much in Yokohama in September?
Rain is frequent, with about 13 rainy days and 165 mm in total.
Yokohama month by month
The whole year in YokohamaAll destinations: JapanWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences