September weather forecast
Shirokanedai, Japan

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Weather in September

September, the first month of the autumn in Shirokanedai, is also a moderately hot month, with an average temperature fluctuating between 27°C (80.6°F) and 21.5°C (70.7°F).

Temperature

Shirokanedai's transition into September involves a gentle shift in temperature, receding from a hot 31°C (87.8°F) in August to a warm 27°C (80.6°F). Nighttime temperature dips to a mean of 21.5°C (70.7°F) during September.

Heat index

Throughout September, the heat index is evaluated at 29°C (84.2°F). Long-standing exposure and activity could induce a feeling of tiredness and lead to heat cramps.
Always consider that heat index estimations are for light winds and places in the shade. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', binds temperature metrics with humidity values to give a sense of the actual warmth. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.

Humidity

In September, the average relative humidity in Shirokanedai is 73%.

Rainfall

September is the month with the most rainfall. Rain falls for 13.3 days and accumulates 54mm (2.13") of precipitation.

Snowfall

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

Daylight

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

Sunshine

In September, the average sunshine in Shirokanedai is 7.9h.

UV index

In Shirokanedai, Japan, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: During September, 5 as the daily maximum UV index converts into the following advice:
Take necessary precautions - Suggestions to elude sunburn are provided. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
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Frequently asked questions

What are September temperatures in Shirokanedai?

The average high-temperature, in September, in Shirokanedai, is 27°C (80.6°F), while the average low-temperature is 21.5°C (70.7°F). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in September is evaluated at 29°C (84.2°F).

What is the average humidity in September in Shirokanedai?

In Shirokanedai, Japan, the average relative humidity in September is 73%.

What is the rainiest month in Shirokanedai?

September is the month with the most rainfall in Shirokanedai. Rain falls for 13.3 days and accumulates 54mm (2.13") of precipitation.

How many days does it rain in September in Shirokanedai?

In Shirokanedai, Japan, in September, it is raining for 13.3 days, with typically 54mm (2.13") of accumulated precipitation.

When it does not snow in Shirokanedai?

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

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

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

When are sunrise and sunset in September in Shirokanedai?

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

How many hours of sunshine does Shirokanedai have in September?

In Shirokanedai, the average sunshine duration in September is 7.9h.

What is the UV index reading in September in Shirokanedai?

The average daily maximum UV index in September in Shirokanedai is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe 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
Shirokanedai, Japan

Average temperature in September - Shirokanedai, Japan
  • Average high temperature in September: 27°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: 21.5°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
Shirokanedai, Japan

Average pressure in September - Shirokanedai, 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
Shirokanedai, Japan

Average wind speed in September - Shirokanedai, Japan
  • Average wind speed in September: 12.9km/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
Shirokanedai, Japan

Average humidity in September - Shirokanedai, Japan
  • Average humidity in September: 73%

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
Shirokanedai, Japan

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

The wettest month (with the highest rainfall) is September (54mm).
The driest month (with the least rainfall) is December (21mm).

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Average rainfall days in September
Shirokanedai, Japan

Average rainfall days in September - Shirokanedai, Japan
  • Average rainfall days in September: 13.3 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
Shirokanedai, Japan

Average snowfall in September - Shirokanedai, 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
Shirokanedai, Japan

Average snowfall days in September - Shirokanedai, 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 daylight in September /
Average sunshine in September
Shirokanedai, Japan

Average daylight in September / Average sunshine in September - Shirokanedai, 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 48min).

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Average sunshine days in September
Shirokanedai, Japan

Average sunshine days in September - Shirokanedai, Japan
  • Average sunshine days in September: 14.3 days

The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is September (14.3 days).

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Average UV index in September
Shirokanedai, Japan

Average UV index in September - Shirokanedai, 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
Shirokanedai, Japan

Average cloud cover in September - Shirokanedai, Japan
  • Average cloud cover in September: 40

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
Shirokanedai, Japan

Average visibility in September - Shirokanedai, 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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Shirokanedai, Japan

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