August weather forecast
Tokyo, Japan

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

Weather in August

August continues with the high summer heat in Tokyo, although there's a slight dip in temperature from July. An exceptionally warm sea temperature at 25.7°C (78.3°F) makes beach excursions enjoyable activities for August. Evenings bring a comforting breeze as the city prepares to bid goodbye to high summer temperatures. Residents often head towards parks, enjoying picnics under the ample shade of trees. August marks the end of the intense summer period, paving the way for the arrival of Autumn in the coming month.

Temperature

August, marked by an average high-temperature of 31°C (87.8°F) and a low-temperature of 25.1°C (77.2°F), is the warmest month in Tokyo.

Heat index

In August, the average heat index is appraised at a very hot 39°C (102.2°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Heat index data is primarily for areas with shade and subjected to light winds. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In Tokyo, the average relative humidity in August is 73%.

Rainfall

In Tokyo, during August, the rain falls for 9.7 days and regularly aggregates up to 26mm (1.02") of precipitation. In Tokyo, during the entire year, the rain falls for 134.5 days and collects up to 425mm (16.73") of precipitation.

Snowfall

April through December are months without snowfall.

Sea temperature

The month with the warmest seawater is August, with an average sea temperature of 25.7°C (78.3°F).
Note: For activities in the water such as swimming or diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are considered optimal for prolonged enjoyment without discomfort.

Daylight

In Tokyo, the average length of the day in August is 13h and 29min.
On the first day of the month, sunrise is at 04:49 and sunset at 18:45. On the last day of August, sunrise is at 05:12 and sunset at 18:10 JST.

Sunshine

The month with the most sunshine in Tokyo is August, with an average of 10.3h of sunshine.

UV index

In Tokyo, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily high UV index of 6 in August leads to these guidelines:
Prevent overexposure. Protection from the sun's harmful effects is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Beware! Reflections from sand and water can intensify the Sun's UV radiation.

Frequently asked questions

What is the warmest month in Tokyo?

In Tokyo, Japan, the peak temperatures are generally noted in August, averaging a high of 31°C (87.8°F) and a low of 25.1°C (77.2°F).

How hot is it in Tokyo in August?

In Tokyo, 31°C (87.8°F) is the average high-temperature and 25.1°C (77.2°F) is the average low-temperature during August. The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in August is appraised at 39°C (102.2°F).

What is the average humidity in August in Tokyo?

In Tokyo, Japan, the average relative humidity in August is 73%.

How many days does it rain in August in Tokyo?

In Tokyo, Japan, in August, it is raining for 9.7 days, with typically 26mm (1.02") of accumulated precipitation.

When it does not snow in Tokyo?

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

What is the month with the warmest sea water in Tokyo?

August is the month with the warmest seawater in Tokyo, with an average sea temperature of 25.7°C (78.3°F).

What is the water temperature in August in Tokyo?

In Tokyo, Japan, in August, the average water temperature is 25.7°C (78.3°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 August in Tokyo?

In Tokyo, the average day length in August is 13h and 29min.

When are sunrise and sunset in August in Tokyo?

In August, on the first day of the month, sunrise is at 04:49 and sunset at 18:45. On the last day of the month, in Tokyo, sunrise is at 05:12 and sunset at 18:10 JST.

What month has the most sunshine in Tokyo?

With an average of 10.3h of sunshine, August has the most sunshine of the year in Tokyo, Japan.

How many hours of sunshine does Tokyo have in August?

The average sunshine duration in August in Tokyo is 10.3h.

What is the UV index reading in August in Tokyo?

In Tokyo, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability 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 August
Tokyo, Japan

Average temperature in August - Tokyo, Japan
  • Average high temperature in August: 31°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 August: 25.1°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).

Average pressure in August
Tokyo, Japan

Average pressure in August - Tokyo, Japan
  • Average pressure in August: 1010.2mbar

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

Average wind speed in August
Tokyo, Japan

Average wind speed in August - Tokyo, Japan
  • Average wind speed in August: 12.5km/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).

Average humidity in August
Tokyo, Japan

Average humidity in August - Tokyo, Japan
  • Average humidity in August: 73%

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

Average rainfall in August
Tokyo, Japan

Average rainfall in August - Tokyo, Japan
  • Average rainfall in August: 26mm

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

Average rainfall days in August
Tokyo, Japan

Average rainfall days in August - Tokyo, Japan
  • Average rainfall days in August: 9.7 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).

Average snowfall in August
Tokyo, Japan

Average snowfall in August - Tokyo, Japan
  • Average snowfall in August: 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).

Average snowfall days in August
Tokyo, Japan

Average snowfall days in August - Tokyo, Japan
  • Average snowfall days in August: 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).

Average sea temperature in August
Tokyo, Japan

Average sea temperature in August - Tokyo, Japan
  • Average sea temperature in August: 25.7°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).

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

Average daylight in August / Average sunshine in August - Tokyo, Japan
  • Average daylight in August: 13h and 3min

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 August: 10h and 2min

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).

Average sunshine days in August
Tokyo, Japan

Average sunshine days in August - Tokyo, Japan
  • Average sunshine days in August: 19.1 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).

Average UV index in August
Tokyo, Japan

Average UV index in August - Tokyo, Japan
  • Average UV index in August: 6

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).

Average cloud cover in August
Tokyo, Japan

Average cloud cover in August - Tokyo, Japan
  • Average cloud cover in August: 33

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).

Average visibility in August
Tokyo, Japan

Average visibility in August - Tokyo, Japan
  • Average visibility in August: 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).

Tokyo, Japan

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