Tokyo 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 – July, September – November
What is the weather like in Tokyo in September?
In September, Tokyo is warm: daytime highs average 26 °C, and even at night it stays warm at around 20 °C. The sea averages 25.0 °C – pleasant for swimming. Expect around 5 hours of sunshine a day. Rain is frequent, with about 14 rainy days and 167 mm in total. The air is often humid and muggy. All in all, September is a good month for a holiday in Tokyo.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 58 | 66 | 66 |
| Day | 30° | 26° | 21° |
| Night | 24° | 20° | 14° |
| Sea | 26° | 25° | 22° |
| Sun | 6 h | 5 h | 5 h |
| Rain days | 11 | 14 | 13 |
More details for September
- Daylight
- 12 h 27 min05:23 – 17:50
- UV index
- 7 · highclear sky, noon (estimate)
- Muggy days
- 21 daysdew point 18 °C or more
- Wind
- 19 km/haverage daily peak
- Cloud cover
- 67 %on average
- Hot days
- 3 days30 °C or more
- 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 %30 %
- Few rainy daysweight 30 %32 %
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
Tokyo in September: quick answers
Is Tokyo hot in September?
Warm rather than hot: in September, daytime highs in Tokyo average 26 °C and nights cool to about 20 °C. On about 3 days the thermometer climbs to 30 °C or more.
Can you swim in Tokyo in September?
Yes. In September the sea averages 25.0 °C – pleasant for swimming.
Does it rain much in Tokyo in September?
Rain is frequent, with about 14 rainy days and 167 mm in total.
Tokyo month by month
The whole year in TokyoAll destinations: Japan
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)