August Weather in Tokyo Japan
Daily high temperatures decrease by 2°F, from 86°F to 85°F, rarely falling below 77°F or exceeding 93°F. The highest daily average high temperature is 87°F on August 9.
Daily low temperatures are around 76°F, rarely falling below 69°F or exceeding 81°F. The highest daily average low temperature is 77°F on August 8.
For reference, on August 9, the hottest day of the year, temperatures in Tokyo typically range from 77°F to 87°F, while on January 26, the coldest day of the year, they range from 36°F to 48°F.
Average High and Low Temperature in August in Tokyo
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in August in Tokyo
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The month of August in Tokyo experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 57% to 52%.
The clearest day of the month is August 17, with clear, mostly clear, or partly cloudy conditions 49% of the time.
For reference, on June 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 73%, while on December 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.
Cloud Cover Categories in August in Tokyo
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Tokyo, the chance of a wet day over the course of August is gradually increasing, starting the month at 35% and ending it at 39%.
For reference, the year's highest daily chance of a wet day is 48% on June 24, and its lowest chance is 12% on December 28.
Probability of Precipitation in August in Tokyo
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during August in Tokyo is rapidly increasing, starting the month at 4.6 inches, when it rarely exceeds 8.4 inches or falls below 1.5 inches, and ending the month at 6.2 inches, when it rarely exceeds 10.6 inches or falls below 2.2 inches.
The lowest average 31-day accumulation is 4.6 inches on August 3.
Average Monthly Rainfall in August in Tokyo
Over the course of August in Tokyo, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 58 minutes, implying an average daily decrease of 1 minute, 57 seconds, and weekly decrease of 13 minutes, 38 seconds.
The shortest day of the month is August 31, with 12 hours, 59 minutes of daylight and the longest day is August 1, with 13 hours, 58 minutes of daylight.
Hours of Daylight and Twilight in August in Tokyo
The earliest sunrise of the month in Tokyo is 4:48 AM on August 1 and the latest sunrise is 23 minutes later at 5:11 AM on August 31.
The latest sunset is 6:46 PM on August 1 and the earliest sunset is 35 minutes earlier at 6:11 PM on August 31.
Daylight saving time is not observed in Tokyo during 2023.
For reference, on June 21, the longest day of the year, the Sun rises at 4:25 AM and sets 14 hours, 35 minutes later, at 7:00 PM, while on December 22, the shortest day of the year, it rises at 6:47 AM and sets 9 hours, 44 minutes later, at 4:31 PM.
Sunrise & Sunset with Twilight in August in Tokyo
The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.
Solar Elevation and Azimuth in August in Tokyo
The figure below presents a compact representation of key lunar data for August 2023. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in August in Tokyo
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Tokyo is decreasing during August, falling from 89% to 81% over the course of the month.
The highest chance of a muggy day during August is 91% on August 8.
For reference, on August 8, the muggiest day of the year, there are muggy conditions 91% of the time, while on December 21, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in August in Tokyo
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Tokyo is essentially constant during August, remaining within 0.1 miles per hour of 7.2 miles per hour throughout.
For reference, on March 25, the windiest day of the year, the daily average wind speed is 9.1 miles per hour, while on August 1, the calmest day of the year, the daily average wind speed is 7.0 miles per hour.
The lowest daily average wind speed during August is 7.0 miles per hour on August 1.
Average Wind Speed in August in Tokyo
The hourly average wind direction in Tokyo throughout August is predominantly from the south, with a peak proportion of 51% on August 9.
Wind Direction in August in Tokyo
Tokyo is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Tokyo is essentially constant during August, remaining within 1°F of 78°F throughout.
The highest average surface water temperature during August is 79°F on August 20.
Average Water Temperature in August in Tokyo
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in Tokyo typically lasts for 11 months (322 days), from around February 12 to around December 30, rarely starting after March 5, or ending before December 14.
The month of August in Tokyo is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in August in Tokyo
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in Tokyo are very rapidly increasing during August, increasing by 900°F, from 2,408°F to 3,308°F, over the course of the month.
Growing Degree Days in August in Tokyo
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Tokyo is gradually decreasing during August, falling by 0.6 kWh, from 5.9 kWh to 5.2 kWh, over the course of the month.
The highest average daily incident shortwave solar energy during August is 5.9 kWh on August 5.
Average Daily Incident Shortwave Solar Energy in August in Tokyo
For the purposes of this report, the geographical coordinates of Tokyo are 35.689 deg latitude, 139.692 deg longitude, and 141 ft elevation.
The topography within 2 miles of Tokyo contains only modest variations in elevation, with a maximum elevation change of 187 feet and an average elevation above sea level of 124 feet. Within 10 miles also contains only modest variations in elevation (381 feet). Within 50 miles contains only modest variations in elevation (6,972 feet).
The area within 2 miles of Tokyo is covered by artificial surfaces (94%), within 10 miles by artificial surfaces (79%), and within 50 miles by trees (33%) and cropland (26%).
This report illustrates the typical weather in Tokyo, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Tokyo.
For each station, the records are corrected for the elevation difference between that station and Tokyo according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Tokyo is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Tokyo and a given station.
The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Tokyo and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © OpenStreetMap contributors.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.
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