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2 Week Extended Forecast in Kumamoto, Japan

Hour-by-hour weather for Kumamoto next 7 days

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10 Day Kumamoto Weather

(7–10 days)

Kumamoto Weather Next Week

(10–12 days)

The hot season lasts for 3.0 months, from June 23 to September 23, with an average daily high temperature above 81°F. The hottest month of the year in Kumamoto is August, with an average high of 89°F and low of 75°F.

The cool season lasts for 3.1 months, from December 4 to March 8, with an average daily high temperature below 57°F. The coldest month of the year in Kumamoto is January, with an average low of 36°F and high of 50°F.

In Kumamoto, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Kumamoto begins around September 7 and lasts for 6.6 months, ending around March 26.

The clearest month of the year in Kumamoto is December, during which on average the sky is clear, mostly clear, or partly cloudy 72% of the time.

The cloudier part of the year begins around March 26 and lasts for 5.4 months, ending around September 7.

The cloudiest month of the year in Kumamoto is June, during which on average the sky is overcast or mostly cloudy 70% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Kumamoto varies significantly throughout the year.

The wetter season lasts 3.3 months, from June 3 to September 13, with a greater than 39% chance of a given day being a wet day. The month with the most wet days in Kumamoto is June, with an average of 15.9 days with at least 0.04 inches of precipitation.

The drier season lasts 8.7 months, from September 13 to June 3. The month with the fewest wet days in Kumamoto is January, with an average of 5.9 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Kumamoto is June, with an average of 15.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 61% on June 27.

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Kumamoto experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Kumamoto. The month with the most rain in Kumamoto is June, with an average rainfall of 14.0 inches.

The month with the least rain in Kumamoto is January, with an average rainfall of 2.1 inches.

The length of the day in Kumamoto varies significantly over the course of the year. In 2022, the shortest day is December 22, with 9 hours, 59 minutes of daylight; the longest day is June 21, with 14 hours, 19 minutes of daylight.

The earliest sunrise is at 5:08 AM on June 12, and the latest sunrise is 2 hours, 12 minutes later at 7:20 AM on January 9. The earliest sunset is at 5:10 PM on December 4, and the latest sunset is 2 hours, 19 minutes later at 7:29 PM on June 30.

Daylight saving time (DST) is not observed in Kumamoto during 2022.

The figure below presents a compact representation of key lunar data for 2022. 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.

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.

Kumamoto experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.1 months, from June 1 to October 6, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The month with the most muggy days in Kumamoto is July, with 30.3 days that are muggy or worse.

The least muggy day of the year is January 31, when muggy conditions are essentially unheard of.

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 Kumamoto experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.2 months, from November 19 to April 26, with average wind speeds of more than 6.0 miles per hour. The windiest month of the year in Kumamoto is February, with an average hourly wind speed of 6.9 miles per hour.

The calmer time of year lasts for 6.8 months, from April 26 to November 19. The calmest month of the year in Kumamoto is August, with an average hourly wind speed of 5.1 miles per hour.

The predominant average hourly wind direction in Kumamoto varies throughout the year.

The wind is most often from the west for 2.0 months, from April 5 to June 5, with a peak percentage of 31% on April 17. The wind is most often from the south for 2.8 months, from June 5 to August 30, with a peak percentage of 43% on July 9. The wind is most often from the north for 7.2 months, from August 30 to April 5, with a peak percentage of 47% on January 1.

Kumamoto 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 water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.6 months, from July 11 to September 30, with an average temperature above 77°F. The month of the year in Kumamoto with the warmest water is August, with an average temperature of 81°F.

The time of year with cooler water lasts for 4.1 months, from December 21 to April 24, with an average temperature below 63°F. The month of the year in Kumamoto with the coolest water is February, with an average temperature of 59°F.

To characterize how pleasant the weather is in Kumamoto throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Kumamoto for general outdoor tourist activities is from early September to mid October, with a peak score in the last week of September.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Kumamoto for hot-weather activities is from mid July to mid September, with a peak score in the second week of August.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 Kumamoto typically lasts for 9.1 months (279 days), from around March 7 to around December 11, rarely starting before February 16 or after March 26, and rarely ending before November 23 or after December 29.

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.

Based on growing degree days alone, the first spring blooms in Kumamoto should appear around March 8, only rarely appearing before February 23 or after March 22.

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 experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 2.3 months, from April 11 to June 22, with an average daily incident shortwave energy per square meter above 5.4 kWh. The brightest month of the year in Kumamoto is May, with an average of 5.9 kWh.

The darker period of the year lasts for 2.8 months, from November 12 to February 5, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest month of the year in Kumamoto is December, with an average of 2.8 kWh.

For the purposes of this report, the geographical coordinates of Kumamoto are 32.806 deg latitude, 130.692 deg longitude, and 30 ft elevation.

The topography within 2 miles of Kumamoto contains very significant variations in elevation, with a maximum elevation change of 1,424 feet and an average elevation above sea level of 143 feet. Within 10 miles contains very significant variations in elevation (2,234 feet). Within 50 miles contains large variations in elevation (5,869 feet).

The area within 2 miles of Kumamoto is covered by cropland (53%) and trees (28%), within 10 miles by cropland (46%) and trees (27%), and within 50 miles by trees (59%) and water (24%).

This report illustrates the typical weather in Kumamoto, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Kumamoto.

For each station, the records are corrected for the elevation difference between that station and Kumamoto 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 Kumamoto is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Kumamoto and a given station.

The stations contributing to this reconstruction are:

• Kumamoto Airport (RJFT, 71%, 10 mi, east, 610 ft elevation change)
• Saga Airport (RJFS, 22%, 33 mi, northwest, -26 ft elevation change)
• Kagoshima Airport (RJFK, 7%, 69 mi, south, 876 ft elevation change)

To get a sense of how much these sources agree with each other, you can view a comparison of Kumamoto 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.

Other 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.

Disclaimer

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.

Please review our full terms contained on our Terms of Service page.