Tokyo
Japan
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Tokyo, Japan

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A stunning view of the cityscape of Tokyo, Japan, taken at dusk
A stunning view of the cityscape of Tokyo, Japan, taken at dusk
September is a transitional month into autumn, but its weather feels more like the summer weather. Typhoons are experienced more in the middle of the month resulting in heavier rains than usual falling for up to twenty days to collect average precipitation of 180.3mm (7.1").
The temperatures average 20°C (68°F) on the coldest days and 26°C (78.8°F) on the warmest days making it moderately warm especially with a reduction in the sunshine hours to four per day.
The ocean remains busy throughout the month with lots of swimming in the 25°C (77°F) warm water. Outdoor activities rise due to the warm temperatures and less scorching sun.
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  • The average high temperature in September: 26.9°C

The warmest month (with the highest average high temperature) is August (30.8°C).
The month with the lowest average high temperature is January (9.6°C).

  • The average low temperature in September: 19.7°C

The month with the highest average low temperature is August (23°C).
The coldest month (with the lowest average low temperature) is January (0.9°C).

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  • The average humidity in September: 75%

The month with the highest relative humidity is July (77%).
The month with the lowest relative humidity is January (52%).

  • The average rainfall in September: 131.1mm

The wettest month (with the highest rainfall) is May (145.4mm).
The driest month (with the lowest rainfall) is February (58.2mm).

  • The average rainfall days in September: 11.6 days

The month with the highest number of rainy days is October (13 days).
The month with the lowest number of rainy days is July (8.4 days).

  • The average snowfall in September: 0mm

Months with the highest snowfall are January and February (50mm).
Months with the lowest snowfall are April, May, June, July, August, September, October, November and December (0mm).

  • The average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.7 days).
Months with the lowest number of snowfall days are May, June, July, August, September, October and November (0 days).

  • The average sea temperature in September: 25.3°C

The best month for swimming (with the highest average sea temperature) is August (25.7°C).
The coldest month (with the lowest average sea temperature) is February (14°C).

  • The average daylight in September: 12h

The month with the longest days is June (Average daylight: 15h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The average sunshine in September: 4h

The month with most sunshine is January (Average sunshine: 6h).
The month with least sunshine is September (Average sunshine: 4h).

  • The average UV index in September: 8

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 2).

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