Weather in Tokyo in September 2025
Average weather
Average temperature in Tokyo in September
Going from a maximum of +36°C during the day to a minimum of +19°C during the night, the temperature in September averages around +31°C.
The average maximum temperature goes down 35% by the end of the month, compared with the beginning of the month, from +34°C to +28°C.
Is Tokyo warm or cold in September?
Tokyo is typically warm in September.
Maximum temperatures go down compared to the previous month from +31°C to +27°C. The minimum temperature also goes down from +25°C to +21°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Tokyo, here is the comparison with other months:
Water temperature in Tokyo in September
Water in Tokyo in September is Warm. It varies from +23°C to +27°C, with an average of +25°C. This is almost similar to the air temperature, which averages +27°C.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Tokyo in September?
Climate in Tokyo in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +31°C | +27°C | +22°C | ||||
| Min. temperature | ||||||
| +17°C | +12°C | +4°C | ||||
| Max. temperature | ||||||
| +38°C | +37°C | +31°C | ||||
| Rainfall | ||||||
| 165 mm | 233 mm | 233 mm | ||||
| Wind | ||||||
| 4 m/s | 4 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +26°C | +25°C | +22°C | ||||
| Humidity | ||||||
| 74% | 74% | 68% | ||||
| Air pressure | ||||||
| 1008 HPa | 1012 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 2 | 2 | 4 | ||||
| Cloudy days | ||||||
| 9 | 8 | 9 | ||||
| Rainy days | ||||||
| 17 | 18 | 17 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting colder in September. From +31°C in the day, the average maximum temperature lowers to +27°C. Prepare for more rain. Average rainfall goes from 165 mm to 233 mm. Humidity levels don’t change as the month goes on, averaging around 74%. The average wind speed doesn’t change much during September, staying around 4 m/s. The amount of sunny days stay about the same, averaging 2 sunny days during the month.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 5 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Tokyo is gradually decreasing during September, going from 7 m/s to 5 m/s over the course of the month.
Rain
How was the weather last September in Tokyo?
Climate Change over Years
The climate in Tokyo in September has not changed much over the last 43 years.
The average temperature was the lowest in 1984 (+18°C) and the highest in 2023 (+22°C). The driest year was 1984 with only 896 mm of rainfall, and the wettest year was 2021 with 5634 mm.
FAQ
Is September a good time to visit Tokyo?
Can you sunbathe in Tokyo in September?
Can you swim in Tokyo in September?
Is Tokyo rainy in September?
Is it sunny in Tokyo in September?
Other cities in Japan
Monthly weather in Tokyo
Source of the data
For this page, we’ve looked at the typical weather in Tokyo, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.