September weather forecast
Tokyo, Japan

The cityscape of Tokyo, Japan, taken at dusk
The cityscape of Tokyo, Japan, taken at dusk

Weather in September

The first month of the autumn, September, is still a warm month in Tokyo, Japan, with an average temperature ranging between max 26.8°C (80.2°F) and min 21.3°C (70.3°F).

Temperature

In September, the average high-temperature marginally drops from a hot 31°C (87.8°F) in August to a moderately hot 26.8°C (80.2°F). In September, in Tokyo, Japan, the average low-temperature is 21.3°C (70.3°F).

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Tokyo, it is raining for 12.5 days, with typically 46mm (1.81") of accumulated precipitation. In Tokyo, during the entire year, the rain falls for 134.5 days and collects up to 425mm (16.73") of precipitation.

Snowfall

In Tokyo, Japan, snow does not fall in April through December.

Sea temperature

In September, the average sea temperature in Tokyo, Japan, is 25.3°C (77.5°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Tokyo, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 05:12 and sunset at 18:09. On the last day of September, sunrise is at 05:34 and sunset at 17:27 JST.

Sunshine

The average sunshine in September is 8.1h.

UV index

In Tokyo, Japan, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the average humidity in September in Tokyo?

In Tokyo, the average relative humidity in September is 74%.

How many days does it rain in September in Tokyo?

In Tokyo, in September, it is raining for 12.5 days, with typically 46mm (1.81") of accumulated precipitation.

When it does not snow in Tokyo?

In Tokyo, snow does not fall in April through December.

How warm is the water in September in Tokyo?

In September, the average sea temperature is 25.3°C (77.5°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in September in Tokyo?

In Tokyo, Japan, the average day length in September is 12h and 25min.

When is the sunrise / sunset in September in Tokyo?

On the first day of September, sunrise is at 05:12 and sunset at 18:09. On the last day of the month, sunrise is at 05:34 and sunset at 17:27 JST.

How many hours of sunshine does Tokyo have in September?

In Tokyo, Japan, the average sunshine duration in September is 8.1h.

What is the UV index intensity in September in Tokyo?

In September, the average daily maximum UV index in Tokyo, Japan, is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Tokyo, Japan

Average temperature in September - Tokyo, Japan
  • Average high temperature in September: 26.8°C

The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (8.9°C).

  • Average low temperature in September: 21.3°C

The month with the highest average low temperature is August (25.1°C).
The coldest month (with the lowest average low temperature) is January (2.8°C).

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Average pressure in September
Tokyo, Japan

Average pressure in September - Tokyo, Japan
  • Average pressure in September: 1013.5mbar

The month with the highest atmospheric pressure is November (1018.1mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).

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Average wind speed in September
Tokyo, Japan

Average wind speed in September - Tokyo, Japan
  • Average wind speed in September: 12.4km/h

The windiest month (with the highest average wind speed) is April (15.3km/h).
The calmest month (with the lowest average wind speed) is November (12.1km/h).

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Average humidity in September
Tokyo, Japan

Average humidity in September - Tokyo, Japan
  • Average humidity in September: 74%

The month with the highest relative humidity is July (77%).
The month with the lowest relative humidity is January (59%).

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Average rainfall in September
Tokyo, Japan

Average rainfall in September - Tokyo, Japan
  • Average rainfall in September: 46mm

The wettest month (with the highest rainfall) is October (51mm).
The driest month (with the least rainfall) is December (21mm).

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Average rainfall days in September
Tokyo, Japan

Average rainfall days in September - Tokyo, Japan
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is January (7.3 days).

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Average snowfall in September
Tokyo, Japan

Average snowfall in September - Tokyo, Japan
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (21mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in September
Tokyo, Japan

Average snowfall days in September - Tokyo, Japan
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in September
Tokyo, Japan

Average sea temperature in September - Tokyo, Japan
  • 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).

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Average daylight in September /
Average sunshine in September
Tokyo, Japan

Average daylight in September / Average sunshine in September - Tokyo, Japan
  • Average daylight in September: 12h and 25min

The month with the longest days is June (Average daylight: 14h and 32min).
The month with the shortest days is December (Average daylight: 9h and 47min).

  • Average sunshine in September: 8h and 6min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 5h and 48min).

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Average sunshine days in September
Tokyo, Japan

Average sunshine days in September - Tokyo, Japan
  • Average sunshine days in September: 14.8 days

The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is June (14.4 days).

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Average UV index in September
Tokyo, Japan

Average UV index in September - Tokyo, Japan
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 3).

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Average cloud cover in September
Tokyo, Japan

Average cloud cover in September - Tokyo, Japan
  • Average cloud cover in September: 38

The months with the most cloud cover are June and October (Cloud cover 43).
The month with the least cloud cover is January (Cloud cover 28).

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Average visibility in September
Tokyo, Japan

Average visibility in September - Tokyo, Japan
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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