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Climate and Average Weather Year Round in Ijūin Japan

In Ijūin, the summers are warm, oppressive, and mostly cloudy; the winters are cold, windy, and mostly clear; and it is wet year round. Over the course of the year, the temperature typically varies from 40°F to 86°F and is rarely below 33°F or above 90°F.

Based on the tourism score, the best time of year to visit Ijūin for warm-weather activities is from mid September to late October.

Climate in Ijūin

coldcoolcomfortablewarmhotwarmcoolJanFebMarAprMayJunJulAugSepOctNovDecNowNow78%78%22%22%clearovercastprecipitation: 16.0 inprecipitation: 16.0 in2.2 in2.2 inmuggy: 100%muggy: 100%0%0%drydrytourism score: 7.1tourism score: 7.10.60.6
Ijūin weather by month. Click on each chart for more information.

Average Temperature in Ijūin

The hot season lasts for 3.0 months, from June 26 to September 26, with an average daily high temperature above 79°F. The hottest day of the year is August 4, with an average high of 86°F and low of 76°F.

The cool season lasts for 3.2 months, from December 7 to March 13, with an average daily high temperature below 59°F. The coldest day of the year is January 25, with an average low of 40°F and high of 52°F.

Average High and Low Temperature in Ijūin

Average High and Low Temperature in IjūinhotcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2552°FJan 2552°FAug 486°FAug 486°F40°F40°F76°F76°FJun 2679°FJun 2679°FSep 2679°FSep 2679°FDec 759°FDec 759°FMar 1359°FMar 1359°F71°F71°F68°F68°F47°F47°F47°F47°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Ijūin

Average Hourly Temperature in IjūinJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowvery coldcoldcoldcoolcoolcomfortablewarmhotcomfortablecold
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Buxton, North Carolina, United States (7,527 miles away) and Bābolsar, Iran (4,339 miles) are the far-away foreign places with temperatures most similar to Ijūin (view comparison).

Compare Ijūin to another city:

Clouds

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

The clearer part of the year in Ijūin begins around September 8 and lasts for 6.5 months, ending around March 25. On December 14, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 78% of the time, and overcast or mostly cloudy 22% of the time.

The cloudier part of the year begins around March 25 and lasts for 5.5 months, ending around September 8. On June 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 78% of the time, and clear, mostly clear, or partly cloudy 22% of the time.

Cloud Cover Categories in Ijūin

Cloud Cover Categories in IjūinclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Dec 1478%Dec 1478%Jun 2722%Jun 2722%Sep 850%Sep 850%Mar 2550%Mar 2550%NowNowclearmostly clearovercastpartly cloudymostly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

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

The wetter season lasts 5.8 months, from March 23 to September 16, with a greater than 41% chance of a given day being a wet day. The chance of a wet day peaks at 62% on June 22.

The drier season lasts 6.2 months, from September 16 to March 23. The smallest chance of a wet day is 20% on December 27.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 62% on June 22.

Daily Chance of Precipitation in Ijūin

Daily Chance of Precipitation in IjūinwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 2262%Jun 2262%Dec 2720%Dec 2720%Mar 2341%Mar 2341%Sep 1641%Sep 1641%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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. Ijūin experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Ijūin. The most rain falls during the 31 days centered around June 22, with an average total accumulation of 16.0 inches.

The least rain falls around January 1, with an average total accumulation of 2.2 inches.

Average Monthly Rainfall in Ijūin

Average Monthly Rainfall in IjūinJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 in30 in30 inJun 2216.0 inJun 2216.0 inJan 12.2 inJan 12.2 inSep 37.6 inSep 37.6 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Ijūin varies significantly over the course of the year. In 2021, the shortest day is December 22, with 10 hours, 5 minutes of daylight; the longest day is June 21, with 14 hours, 13 minutes of daylight.

Hours of Daylight and Twilight in Ijūin

Hours of Daylight and Twilight in IjūinJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2014 hr, 13 minJun 2114 hr, 13 minJun 2112 hr, 9 minSep 2312 hr, 9 minSep 2310 hr, 5 minDec 2210 hr, 5 minDec 22nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:12 AM on June 12, and the latest sunrise is 2 hours, 6 minutes later at 7:18 AM on January 9. The earliest sunset is at 5:14 PM on December 4, and the latest sunset is 2 hours, 13 minutes later at 7:27 PM on June 30.

Daylight saving time (DST) is not observed in Ijūin during 2021.

Sunrise & Sunset with Twilight in Ijūin

Sunrise & Sunset with Twilight in IjūinJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 125:12 AMJun 125:12 AM7:27 PMJun 307:27 PMJun 30Dec 45:14 PMDec 45:14 PM7:18 AMJan 97:18 AMJan 9daynightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2021. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Moon

The figure below presents a compact representation of key lunar data for 2021. 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.

Moon Rise, Set & Phases in Ijūin

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

Humidity

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.

Ijūin experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.5 months, from May 27 to October 11, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The muggiest day of the year is August 8, with muggy conditions 100% of the time.

The least muggy day of the year is January 14, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Ijūin

Humidity Comfort Levels in IjūinmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 140%Jan 140%100%Aug 8100%Aug 8May 2725%May 2725%Oct 1125%Oct 1125%NowNowmiserablemiserableoppressiveoppressivedrydrymuggymuggyhumidhumidcomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 Ijūin experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 4.8 months, from November 20 to April 14, with average wind speeds of more than 11.2 miles per hour. The windiest day of the year is January 18, with an average hourly wind speed of 13.3 miles per hour.

The calmer time of year lasts for 7.2 months, from April 14 to November 20. The calmest day of the year is July 21, with an average hourly wind speed of 9.1 miles per hour.

Average Wind Speed in Ijūin

Average Wind Speed in IjūinwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphJan 1813.3 mphJan 1813.3 mphJul 219.1 mphJul 219.1 mphNov 2011.2 mphNov 2011.2 mphApr 1411.2 mphApr 1411.2 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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

The wind is most often from the west for 2.0 weeks, from April 29 to May 13 and for 1.9 months, from June 10 to August 7, with a peak percentage of 43% on July 8. The wind is most often from the east for 4.0 weeks, from May 13 to June 10 and for 1.7 months, from August 7 to September 29, with a peak percentage of 40% on September 26. The wind is most often from the north for 7.0 months, from September 29 to April 29, with a peak percentage of 64% on January 1.

Wind Direction in Ijūin

Wind Direction in IjūinNWEWENJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwesteastnorthsouth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Ijūin 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 some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.7 months, from July 11 to October 1, with an average temperature above 79°F. The day of the year with the warmest water is August 17, with an average temperature of 83°F.

The time of year with cooler water lasts for 4.0 months, from December 25 to April 24, with an average temperature below 67°F. The day of the year with the coolest water is February 17, with an average temperature of 64°F.

Average Water Temperature in Ijūin

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Ijūin 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 Ijūin for general outdoor tourist activities is from mid September to late October, with a peak score in the first week of October.

Tourism Score in Ijūin

Tourism Score in Ijūinbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.17.10.60.65.95.94.44.4NowNowprecipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Ijūin for hot-weather activities is from mid July to mid September, with a peak score in the last week of August.

Beach/Pool Score in Ijūin

Beach/Pool Score in Ijūinbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.36.30.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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.

Growing Season

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 Ijūin typically lasts for 11 months (328 days), from around February 7 to around January 1, rarely starting after March 2, or ending before December 18.

Time Spent in Various Temperature Bands and the Growing Season in Ijūin

Time Spent in Various Temperature Bands and the Growing Season in Ijūingrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 750%Feb 750%Jan 150%Jan 190%Mar 290%Mar 290%Dec 1890%Dec 1813%Jan 1613%Jan 16Jul 27100%Jul 27100%NowNowvery coldcoldcoolwarmhotcomfortable
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 percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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 Ijūin should appear around February 21, only rarely appearing before February 7 or after March 8.

Growing Degree Days in Ijūin

Growing Degree Days in IjūinJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°FFeb 2184°FFeb 2184°FMay 19900°FMay 19900°FJun 301,800°FJun 301,800°FDec 315,332°FDec 315,332°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 4.9 months, from April 9 to September 5, with an average daily incident shortwave energy per square meter above 5.3 kWh. The brightest day of the year is July 22, with an average of 5.9 kWh.

The darker period of the year lasts for 2.7 months, from November 12 to February 3, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is December 25, with an average of 2.9 kWh.

Average Daily Incident Shortwave Solar Energy in Ijūin

Average Daily Incident Shortwave Solar Energy in IjūinbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhJul 225.9 kWhJul 225.9 kWhDec 252.9 kWhDec 252.9 kWhApr 95.3 kWhApr 95.3 kWhSep 55.3 kWhSep 55.3 kWhFeb 33.5 kWhFeb 33.5 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Ijūin are 31.617 deg latitude, 130.400 deg longitude, and 305 ft elevation.

The topography within 2 miles of Ijūin contains significant variations in elevation, with a maximum elevation change of 784 feet and an average elevation above sea level of 396 feet. Within 10 miles contains significant variations in elevation (2,231 feet). Within 50 miles contains large variations in elevation (5,587 feet).

The area within 2 miles of Ijūin is covered by trees (74%) and cropland (20%), within 10 miles by trees (57%) and water (28%), and within 50 miles by water (63%) and trees (30%).

Data Sources

This report illustrates the typical weather in Ijūin, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Ijūin.

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

The stations contributing to this reconstruction are: Kagoshima Airport (RJFK, 58%, 37 kilometers, northeast) and Kanoya Ab (RJFY, 42%, 51 kilometers, southeast).

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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.