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Average Weather in Iizuka Japan

In Iizuka, the summers are short, warm, oppressive, and mostly cloudy; the winters are very cold and partly cloudy; and it is wet year round. Over the course of the year, the temperature typically varies from 35°F to 88°F and is rarely below 29°F or above 92°F.

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

Climate Summary

coldcoolcomfortablewarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow70%70%28%28%overcastclearprecipitation: 13.7 inprecipitation: 13.7 in1.8 in1.8 inmuggy: 99%muggy: 99%0%0%drydrytourism score: 6.7tourism score: 6.70.10.1
Click on each chart for more information.

Temperature

The hot season lasts for 2.9 months, from June 23 to September 19, with an average daily high temperature above 80°F. The hottest day of the year is August 5, with an average high of 88°F and low of 76°F.

The cool season lasts for 3.4 months, from December 4 to March 15, with an average daily high temperature below 55°F. The coldest day of the year is January 26, with an average low of 35°F and high of 47°F.

Average High and Low Temperature

Average High and Low Temperature in IizukahotcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2647°FJan 2647°FAug 588°FAug 588°F35°F35°F76°F76°FJun 2380°FJun 2380°FSep 1980°FSep 1980°FDec 455°FDec 455°FMar 1555°FMar 1555°F69°F69°F67°F67°F42°F42°F42°F42°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

Average Hourly Temperature in IizukaJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowvery coldvery coldcoldcoldcoolcoolwarmhotcomfortablevery coldcomfortablevery cold
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.

Cape Charles, Virginia, United States (7,253 miles away) is the far-away foreign place with temperatures most similar to Iizuka (view comparison).

Clouds

In Iizuka, 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 Iizuka begins around September 6 and lasts for 6.6 months, ending around March 25. On October 26, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 70% of the time, and overcast or mostly cloudy 30% of the time.

The cloudier part of the year begins around March 25 and lasts for 5.4 months, ending around September 6. On July 2, the cloudiest day of the year, the sky is overcast or mostly cloudy 72% of the time, and clear, mostly clear, or partly cloudy 28% of the time.

Cloud Cover Categories

Cloud Cover Categories in IizukaclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2670%Oct 2670%Jul 228%Jul 228%Sep 649%Sep 649%Mar 2549%Mar 2549%NowNowclearmostly clearpartly cloudyovercastmostly 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 Iizuka varies significantly throughout the year.

The wetter season lasts 3.0 months, from June 9 to September 10, with a greater than 38% chance of a given day being a wet day. The chance of a wet day peaks at 57% on July 2.

The drier season lasts 9.0 months, from September 10 to June 9. The smallest chance of a wet day is 19% on January 23.

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 57% on July 2.

Daily Chance of Precipitation

Daily Chance of Precipitation in IizukawetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 257%Jul 257%Jan 2319%Jan 2319%Jan 120%Jan 120%Jun 938%Jun 938%Sep 1038%Sep 1038%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. Iizuka experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Iizuka. The most rain falls during the 31 days centered around June 30, with an average total accumulation of 13.7 inches.

The least rain falls around December 30, with an average total accumulation of 1.8 inches.

Average Monthly Rainfall

Average Monthly Rainfall in IizukaJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 inJun 3013.7 inJun 3013.7 inDec 301.8 inDec 301.8 inAug 317.1 inAug 317.1 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 Iizuka varies significantly over the course of the year. In 2021, the shortest day is December 22, with 9 hours, 55 minutes of daylight; the longest day is June 21, with 14 hours, 23 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in IizukaJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2014 hr, 23 minJun 2114 hr, 23 minJun 2112 hr, 9 minSep 2312 hr, 9 minSep 239 hr, 55 minDec 229 hr, 55 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 5:06 AM on June 13, and the latest sunrise is 2 hours, 16 minutes later at 7:22 AM on January 8. The earliest sunset is at 5:08 PM on December 4, and the latest sunset is 2 hours, 23 minutes later at 7:31 PM on June 29.

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

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in IizukaJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:06 AMJun 135:06 AM7:31 PMJun 297:31 PMJun 29Dec 45:08 PMDec 45:08 PM7:22 AMJan 87:22 AMJan 8daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
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

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.

Iizuka experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.9 months, from June 5 to October 3, 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 5, with muggy conditions 99% of the time.

The least muggy day of the year is December 22, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in IizukamuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Dec 220%Dec 220%99%Aug 599%Aug 5Jun 525%Jun 525%Oct 325%Oct 325%NowNowoppressiveoppressivedrydrymiserablemiserablehumidhumidmuggymuggycomfortablecomfortable
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 Iizuka experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.1 months, from November 14 to April 18, with average wind speeds of more than 7.9 miles per hour. The windiest day of the year is January 17, with an average hourly wind speed of 9.5 miles per hour.

The calmer time of year lasts for 6.9 months, from April 18 to November 14. The calmest day of the year is August 4, with an average hourly wind speed of 6.3 miles per hour.

Average Wind Speed

Average Wind Speed in IizukawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphJan 179.5 mphJan 179.5 mphAug 46.3 mphAug 46.3 mphNov 147.9 mphNov 147.9 mphApr 187.9 mphApr 187.9 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 Iizuka varies throughout the year.

The wind is most often from the north for 2.0 months, from February 7 to April 6; for 2.0 weeks, from May 22 to June 5; and for 3.3 months, from August 21 to November 30, with a peak percentage of 46% on October 7. The wind is most often from the west for 1.5 months, from April 6 to May 22 and for 2.2 months, from November 30 to February 7, with a peak percentage of 32% on April 17. The wind is most often from the south for 1.9 months, from June 16 to August 13, with a peak percentage of 36% on July 10.

Wind Direction

Wind Direction in IizukaWNWNESNWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestnorthsoutheast
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

Iizuka 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 2.5 months, from July 12 to September 29, with an average temperature above 76°F. The day of the year with the warmest water is August 17, with an average temperature of 81°F.

The time of year with cooler water lasts for 4.0 months, from December 26 to April 27, with an average temperature below 62°F. The day of the year with the coolest water is February 22, with an average temperature of 57°F.

Average Water Temperature

Average Water Temperature in IizukawarmcoolJanFebMarAprMayJunJulAugSepOctNovDec55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FAug 1781°FAug 1781°F57°FFeb 2257°FFeb 22Jul 1276°FJul 1276°FSep 2976°FSep 2976°FDec 2662°FDec 2662°FApr 2762°FApr 2762°FNowNow
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 Iizuka 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 Iizuka for general outdoor tourist activities is from early September to mid October, with a peak score in the last week of September.

Tourism Score

Tourism Score in Iizukabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.76.70.10.16.06.04.74.7NowNowprecipitationprecipitationcloudscloudstemperaturetemperaturetourism 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 Iizuka for hot-weather activities is from mid July to early September, with a peak score in the second week of August.

Beach/Pool Score

Beach/Pool Score in Iizukabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.36.30.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperaturebeach/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 Iizuka typically lasts for 9.0 months (275 days), from around March 14 to around December 14, rarely starting before February 19 or after April 2, and rarely ending before November 25 or after January 1.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Iizukagrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 1450%Mar 1450%Dec 1450%Dec 1490%Apr 290%Apr 290%Nov 2590%Nov 2510%Feb 1910%Feb 1911%Jan 111%Jan 10%Jan 160%Jan 16Jul 30100%Jul 30100%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 Iizuka should appear around March 25, only rarely appearing before March 12 or after April 7.

Growing Degree Days

Growing Degree Days in IizukaJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°FMar 2579°FMar 2579°FJun 5900°FJun 5900°FJul 121,800°FJul 121,800°FDec 314,698°FDec 314,698°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 4.4 months, from April 14 to August 25, with an average daily incident shortwave energy per square meter above 5.5 kWh. The brightest day of the year is May 23, with an average of 6.2 kWh.

The darker period of the year lasts for 2.9 months, from November 11 to February 7, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest day of the year is December 25, with an average of 2.5 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in IizukabrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhMay 236.2 kWhMay 236.2 kWhDec 252.5 kWhDec 252.5 kWhApr 145.5 kWhApr 145.5 kWhAug 255.5 kWhAug 255.5 kWhFeb 73.3 kWhFeb 73.3 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 Iizuka are 33.637 deg latitude, 130.687 deg longitude, and 69 ft elevation.

The topography within 2 miles of Iizuka contains only modest variations in elevation, with a maximum elevation change of 358 feet and an average elevation above sea level of 90 feet. Within 10 miles contains only modest variations in elevation (2,995 feet). Within 50 miles contains large variations in elevation (5,810 feet).

The area within 2 miles of Iizuka is covered by cropland (83%) and trees (12%), within 10 miles by trees (55%) and cropland (40%), and within 50 miles by water (50%) and trees (33%).

Data Sources

This report illustrates the typical weather in Iizuka, 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 Iizuka.

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

The stations contributing to this reconstruction are: Fukuoka Airport (35%, 23 kilometers, west); Ashiya Ab (26%, 28 kilometers, north); Kitakyushu Airport (20%, 33 kilometers, northeast); and Tsuiki Ab (20%, 33 kilometers, east).

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.