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Weather & Climate in Unzen, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Unzen enjoys a temperate climate with an average annual temperature of 58°F (15°C). Winters average 39°F in January while summers reach 77°F in July. The area gets 185 sunny days per year. Annual precipitation totals 91.1 inches (wetter than the 38-inch national average). The city sits at an elevation of 1,791 feet.
Temperature
39°F Jan (4°C)
77°F Jul (25°C)
| Annual Average | 58.1°F |
| 8% above US avg | |
| January Average | 39°F (4°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 185 days/yr |
Geography
| Elevation | 1,791 ft (546 m) |
| Area | 264.0 sq mi (683.8 km²) |
| Population Density | 156/sq mi |
| Coordinates | 32.7711°N, 130.2484°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
276 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.0.
| Apr 15, 2016 | 6 km ESE of Kumamoto, Japan | M7.0 | 47 km | 10 km |
| Dec 2, 1996 | 17 km SW of Miyazaki, Japan | M6.7 | 148 km | 49 km |
| Mar 20, 2005 | 28 km NNW of Maebaru-ch??, Japan | M6.6 | 116 km | 10 km |
| Jun 11, 2006 | 15 km S of Tsukawaki, Japan | M6.3 | 93 km | 140 km |
| Apr 14, 2016 | 2 km SSE of Kumamoto, Japan | M6.2 | 43 km | 9 km |
| Mar 26, 1997 | 16 km NE of Satsumasendai, Japan | M6.1 | 96 km | 10 km |
| May 13, 1997 | 1 km WNW of Satsumasendai, Japan | M6.1 | 105 km | 33 km |
| Apr 14, 2016 | 5 km ENE of Uto, Japan | M6.0 | 45 km | 8 km |
| Apr 5, 2009 | 10 km N of Miyazaki, Japan | M5.8 | 139 km | 26 km |
| Apr 15, 2016 | 6 km S of Kikuchi, Japan | M5.7 | 55 km | 10 km |
| Apr 2, 1997 | 19 km W of Satsumasendai, Japan | M5.5 | 106 km | 10 km |
| Jul 12, 2015 | 12 km SSW of Usuki, Japan | M5.5 | 143 km | 53 km |
| Apr 15, 2016 | 10 km NE of Aso, Japan | M5.5 | 89 km | 13 km |
| Apr 18, 2016 | 8 km NNE of Aso, Japan | M5.5 | 84 km | 10 km |
| Apr 19, 2005 | 8 km NNW of Maebaru-ch??, Japan | M5.5 | 97 km | 19 km |
| Nov 4, 2002 | Kyushu, Japan | M5.4 | 129 km | 33 km |
| Apr 15, 2016 | 5 km WSW of Aso, Japan | M5.4 | 74 km | 4 km |
| Apr 14, 2016 | 14 km ESE of Kumamoto, Japan | M5.4 | 54 km | 10 km |
| Feb 12, 1994 | 4 km WSW of ?kuchi-shinohara, Japan | M5.4 | 85 km | 31 km |
| Apr 15, 2016 | 13 km ESE of Kumamoto, Japan | M5.3 | 54 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
66 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Shanshan | Category 3 | 109 mph | 31 km |
| 2022 | Nanmadol | Category 3 | 104 mph | 24 km |
| 2022 | Hinnamnor | Category 2 | 86 mph | 255 km |
| 2020 | Haishen | Category 3 | 104 mph | 110 km |
| 2020 | Maysak | Category 2 | 92 mph | 224 km |
| 2019 | Francisco | Category 1 | 81 mph | 36 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 143 km |
| 2018 | Trami | Category 1 | 98 mph | 218 km |
| 2017 | Noru | Category 1 | 69 mph | 218 km |
| 2016 | Malakas | Category 3 | 109 mph | 176 km |
| 2016 | Chaba | Category 1 | 81 mph | 269 km |
| 2016 | Namtheun | Category 1 | 75 mph | 222 km |
| 2015 | Goni | Category 3 | 104 mph | 15 km |
| 2014 | Halong | Category 1 | 86 mph | 266 km |
| 2013 | Danas | Category 2 | 75 mph | 193 km |
| 2012 | Sanba | Category 3 | 104 mph | 222 km |
| 2012 | Damrey | Category 1 | 63 mph | 249 km |
| 2011 | Ma-on | Category 1 | 86 mph | 254 km |
| 2007 | Usagi | Category 3 | 104 mph | 120 km |
| 2007 | Man-yi | Category 2 | 86 mph | 149 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
14 tsunamis recorded within 500 km. Highest wave on record: 55.0 m (180 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1792 | SHIMABARA BAY, KYUSHU ISLAND | Landslide | 55.0 m | 15,000 | 5 km |
| 1596 | BEPPU BAY, KYUSHU | Eruption + Earthquake | 8.0 m | 708 | 148 km |
| 1780 | SW. KYUSHU ISLAND | Astronomical | 6.0 m | - | 137 km |
| 1914 | SEIKAIDO | Eruption | 3.0 m | 63 | 138 km |
| 1996 | SEA OF JAPAN | Earthquake | 0.2 m | - | 148 km |
| 1828 | AMAKUSA SEA | Earthquake | - | - | 38 km |
| 1781 | SW. KYUSHU ISLAND | Astronomical | - | 38 | 138 km |
| 1780 | SW. KYUSHU ISLAND | Astronomical | - | - | 137 km |
| 1715 | SEIKAIDO | Earthquake | - | - | 148 km |
| 1698 | SEIKAIDO-NANKAIDO | Earthquake | - | - | 148 km |
| 1619 | YATSUSHIRO, JAPAN | Earthquake | - | - | 45 km |
| 1597 | BEPPU BAY, JAPAN | Eruption + Earthquake | - | 40 | 139 km |
| 766 | N. KAGOSHIMA BAY | Astronomical | - | - | 137 km |
| 744 | SW. KYUSHU ISLAND | Earthquake | - | 1,520 | 48 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
9 volcanoes within 200 km. Closest: Unzendake (5 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Unzendake | Complex | 1,483 m (4,865 ft) | 1996 | 5 km |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 81 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 100 km |
| Kirishimayama | Shield | 1,700 m (5,577 ft) | 2018 | 110 km |
| Yonemaru-Sumiyoshiike | Maar(s) | 40 m (131 ft) | -6200 | 116 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 121 km |
| Fukue | Shield(s) | 315 m (1,033 ft) | -400 | 132 km |
| Aira | Caldera | 1,117 m (3,665 ft) | 2020 | 137 km |
| Ata | Caldera(s) | 924 m (3,031 ft) | 885 | 175 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 3.0 in | Coldest |
| February | 40°F (5°C) | 3.9 in | |
| March | 46°F (8°C) | 6.3 in | |
| April | 56°F (13°C) | 7.6 in | |
| May | 63°F (17°C) | 9.0 in | |
| June | 69°F (21°C) | 16.1 in | |
| July | 77°F (25°C) | 17.2 in | Wettest |
| August | 78°F (26°C) | 8.9 in | Warmest |
| September | 72°F (22°C) | 8.9 in | |
| October | 62°F (17°C) | 4.4 in | |
| November | 53°F (11°C) | 3.2 in | |
| December | 43°F (6°C) | 2.5 in | Driest |
Unzen has a seasonal temperature swing of 39°F / from 39°F in January to 78°F in August. Total annual precipitation is 91.2 inches, with July being the wettest month (17.2") and December the driest (2.5").