September weather forecast
Roppongi, Japan

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Weather in September

September, the first month of the autumn in Roppongi, is also a moderately hot month, with an average temperature varying between 21.5°C (70.7°F) and 26.9°C (80.4°F).

Temperature

The arrival of September correlates with a minor temperature reduction, down from August's hot 30.6°C (87.1°F) to a moderately hot 26.9°C (80.4°F). During the month of September, the nighttime temperature falls to an average of 21.5°C (70.7°F).

Humidity

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

Rainfall

September is the month with the most rainfall. Rain falls for 12.9 days and accumulates 54mm (2.13") of precipitation.

Snowfall

March through December are months without snowfall in Roppongi.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of the month, sunrise is at 05:13 and sunset at 18:08. On the last day of September, in Roppongi, Japan, sunrise is at 05:35 and sunset at 17:26 JST.

Sunshine

In September, the average sunshine in Roppongi is 7.8h.

UV index

In Roppongi, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In September, the maximum UV index of 6 transforms into these recommendations:
Deflect overexposure. Sun protection is a necessity. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
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Frequently asked questions

What are September temperatures in Roppongi?

In Roppongi, in September, the average high-temperature is 26.9°C (80.4°F), and the average low-temperature is 21.5°C (70.7°F). In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 38°C (100.4°F).

What is the average humidity in September in Roppongi?

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

What is the rainiest month in Roppongi?

September is the month with the most rainfall in Roppongi. Rain falls for 12.9 days and accumulates 54mm (2.13") of precipitation.

How many days does it rain in September in Roppongi?

In Roppongi, Japan, in September, it is raining for 12.9 days, with typically 54mm (2.13") of accumulated precipitation.

When it does not snow in Roppongi?

March through December are months without snowfall in Roppongi, Japan.

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

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

What time are sunrise and sunset in September in Roppongi?

In September, on the first day of the month, sunrise is at 05:13 and sunset at 18:08. On the last day of the month, in Roppongi, sunrise is at 05:35 and sunset at 17:26 JST.

How long on average sun shines in September in Roppongi?

In September, the average sunshine duration in Roppongi, Japan, is 7.8h.

How high is the UV index in September in Roppongi?

In Roppongi, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Roppongi, Japan

Average temperature in September - Roppongi, Japan
  • Average high temperature in September: 26.9°C

The warmest month (with the highest average high temperature) is August (30.6°C).
The month with the lowest average high temperature is January (8.8°C).

  • Average low temperature in September: 21.5°C

The month with the highest average low temperature is August (24.9°C).
The coldest month (with the lowest average low temperature) is January (3°C).

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Average pressure in September
Roppongi, Japan

Average pressure in September - Roppongi, Japan
  • Average pressure in September: 1013.4mbar

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
Roppongi, Japan

Average wind speed in September - Roppongi, Japan
  • Average wind speed in September: 13km/h

The windiest month (with the highest average wind speed) is April (15.6km/h).
The calmest month (with the lowest average wind speed) is November (12.3km/h).

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Average humidity in September
Roppongi, Japan

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

The month with the highest relative humidity is July (79%).
The month with the lowest relative humidity is January (60%).

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Average rainfall in September
Roppongi, Japan

Average rainfall in September - Roppongi, Japan
  • Average rainfall in September: 54mm

The wettest month (with the highest rainfall) is September (54mm).
The driest month (with the least rainfall) is February (10mm).

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Average rainfall days in September
Roppongi, Japan

Average rainfall days in September - Roppongi, Japan
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is July (16.1 days).
The month with the least rainy days is January (4.5 days).

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Average snowfall in September
Roppongi, Japan

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

The month with the highest snowfall is February (4mm).
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in September
Roppongi, Japan

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

The month with the highest number of snowfall days is February (1.2 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 daylight in September /
Average sunshine in September
Roppongi, Japan

Average daylight in September / Average sunshine in September - Roppongi, Japan
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 7h and 5min

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 42min).

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Average sunshine days in September
Roppongi, Japan

Average sunshine days in September - Roppongi, Japan
  • Average sunshine days in September: 13.8 days

The month with the most sunshine days is January (25.4 days).
The month with the least sunshine days is June (11.5 days).

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Average UV index in September
Roppongi, Japan

Average UV index in September - Roppongi, Japan
  • Average UV index in September: 6

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is January (UV index 2).

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Average cloud cover in September
Roppongi, Japan

Average cloud cover in September - Roppongi, Japan
  • Average cloud cover in September: 41

The months with the most cloud cover are June and October (Cloud cover 44).
The month with the least cloud cover is January (Cloud cover 28).

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Average visibility in September
Roppongi, Japan

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

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).

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Roppongi, Japan

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