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Weather & Climate in Aso, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Aso experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 33°F in January while summers reach 72°F in July. The area gets 174 sunny days per year. Annual precipitation totals 101.1 inches (wetter than the 38-inch national average). The area receives 7.4 inches of snow annually. The city sits at an elevation of 1,706 feet.
Temperature
33°F Jan (1°C)
72°F Jul (22°C)
| Annual Average | 53.6°F |
| 1% below US avg | |
| January Average | 33°F (1°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 174 days/yr |
Geography
| Elevation | 1,706 ft (520 m) |
| Area | 145.3 sq mi (376.2 km²) |
| Population Density | 186/sq mi |
| Coordinates | 32.9373°N, 131.0801°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
480 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.1.
| Aug 8, 2024 | 2024 Hyuganada Sea, Japan Earthquake | M7.1 | 137 km | 24 km |
| Apr 15, 2016 | 6 km ESE of Kumamoto, Japan | M7.0 | 35 km | 10 km |
| Jan 13, 2025 | 15 km SE of Miyazaki, Japan | M6.8 | 131 km | 39 km |
| Dec 2, 1996 | 17 km SW of Miyazaki, Japan | M6.7 | 130 km | 49 km |
| Oct 19, 1996 | 5 km SE of Miyazaki, Japan | M6.7 | 123 km | 22 km |
| Mar 20, 2005 | 28 km NNW of Maebaru-ch??, Japan | M6.6 | 131 km | 10 km |
| Mar 13, 2014 | 32 km SSW of Hikari, Japan | M6.3 | 108 km | 79 km |
| Apr 17, 2024 | 18 km W of Uwajima, Japan | M6.3 | 125 km | 32 km |
| Jun 11, 2006 | 15 km S of Tsukawaki, Japan | M6.3 | 23 km | 140 km |
| Jan 21, 2022 | 27 km SSE of Saiki, Japan | M6.3 | 93 km | 39 km |
| Apr 14, 2016 | 2 km SSE of Kumamoto, Japan | M6.2 | 39 km | 9 km |
| May 9, 2019 | 43 km ESE of Miyazaki, Japan | M6.2 | 148 km | 22 km |
| Mar 26, 1997 | 16 km NE of Satsumasendai, Japan | M6.1 | 129 km | 10 km |
| May 13, 1997 | 1 km WNW of Satsumasendai, Japan | M6.1 | 145 km | 33 km |
| Apr 14, 2016 | 5 km ENE of Uto, Japan | M6.0 | 43 km | 8 km |
| Apr 5, 2009 | 10 km N of Miyazaki, Japan | M5.8 | 108 km | 26 km |
| Aug 28, 2014 | 53 km E of Takanabe, Japan | M5.8 | 132 km | 20 km |
| Apr 15, 2016 | 6 km S of Kikuchi, Japan | M5.7 | 25 km | 10 km |
| Oct 19, 1996 | 19 km ENE of Miyazaki, Japan | M5.7 | 120 km | 33 km |
| Apr 25, 2001 | 18 km SE of Saiki, Japan | M5.7 | 89 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
59 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 | 88 km |
| 2022 | Nanmadol | Category 3 | 104 mph | 70 km |
| 2020 | Haishen | Category 2 | 98 mph | 185 km |
| 2020 | Maysak | Category 1 | 92 mph | 293 km |
| 2019 | Francisco | Category 1 | 81 mph | 45 km |
| 2018 | Jebi | Category 3 | 98 mph | 262 km |
| 2018 | Trami | Category 1 | 98 mph | 188 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 199 km |
| 2017 | Noru | Category 1 | 69 mph | 170 km |
| 2016 | Malakas | Category 3 | 109 mph | 148 km |
| 2016 | Namtheun | Category 1 | 75 mph | 263 km |
| 2015 | Goni | Category 3 | 104 mph | 65 km |
| 2014 | Phanfone | Category 2 | 98 mph | 270 km |
| 2014 | Halong | Category 1 | 86 mph | 193 km |
| 2013 | Danas | Category 1 | 69 mph | 254 km |
| 2012 | Sanba | Category 3 | 104 mph | 297 km |
| 2011 | Ma-on | Category 1 | 86 mph | 185 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 287 km |
| 2007 | Usagi | Category 3 | 104 mph | 40 km |
| 2007 | Man-yi | Category 2 | 86 mph | 119 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
20 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 | 76 km |
| 1596 | BEPPU BAY, KYUSHU | Eruption + Earthquake | 8.0 m | 708 | 70 km |
| 1769 | SW. KYUSHU ISLAND | Earthquake | 2.5 m | - | 112 km |
| 1941 | SEIKAIDO | Earthquake | 1.2 m | 2 | 142 km |
| 1939 | SEIKAIDO | Earthquake | 0.8 m | 1 | 112 km |
| 1931 | SEIKAIDO | Earthquake | 0.8 m | 1 | 126 km |
| 1996 | KYUSHU ISLAND | Earthquake | 0.6 m | - | 123 km |
| 2024 | HYUGANADA SEA | Earthquake | 0.5 m | - | 142 km |
| 1970 | SEIKAIDO | Earthquake | 0.3 m | - | 101 km |
| 1899 | SEIKAIDO | Earthquake | 0.3 m | - | 144 km |
| 2025 | HYUGANADA SEA | Earthquake | 0.2 m | - | 134 km |
| 1996 | SEA OF JAPAN | Earthquake | 0.2 m | - | 130 km |
| 1984 | KYUSHU, JAPAN | Earthquake | 0.2 m | - | 102 km |
| 1969 | RYUKYU ISLANDS | Earthquake | 0.1 m | - | 126 km |
| 1987 | KYUSHU ISLAND | Earthquake | 0.0 m | 2 | 123 km |
| 1899 | SEIKAIDO | Earthquake | - | - | 117 km |
| 1828 | AMAKUSA SEA | Earthquake | - | - | 117 km |
| 1715 | SEIKAIDO | Earthquake | - | - | 70 km |
| 1698 | SEIKAIDO-NANKAIDO | Earthquake | - | - | 70 km |
| 1619 | YATSUSHIRO, JAPAN | Earthquake | - | - | 66 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
9 volcanoes within 200 km. Closest: Asosan (6 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 6 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 23 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 48 km |
| Unzendake | Complex | 1,483 m (4,865 ft) | 1996 | 76 km |
| Kirishimayama | Shield | 1,700 m (5,577 ft) | 2018 | 113 km |
| Yonemaru-Sumiyoshiike | Maar(s) | 40 m (131 ft) | -6200 | 138 km |
| Aira | Caldera | 1,117 m (3,665 ft) | 2020 | 155 km |
| Abu | Shield(s) | 641 m (2,103 ft) | -6850 | 180 km |
| Ata | Caldera(s) | 924 m (3,031 ft) | 885 | 197 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 33°F (1°C) | 3.1 in | Coldest |
| February | 35°F (2°C) | 4.3 in | |
| March | 41°F (5°C) | 6.3 in | |
| April | 52°F (11°C) | 8.2 in | |
| May | 59°F (15°C) | 9.8 in | |
| June | 66°F (19°C) | 17.7 in | |
| July | 72°F (22°C) | 19.7 in | Wettest |
| August | 74°F (23°C) | 11.7 in | Warmest |
| September | 68°F (20°C) | 9.2 in | |
| October | 58°F (14°C) | 5.2 in | |
| November | 48°F (9°C) | 3.5 in | |
| December | 38°F (3°C) | 2.6 in | Driest |
Aso has a seasonal temperature swing of 40°F / from 33°F in January to 74°F in August. Total annual precipitation is 101.1 inches, with July being the wettest month (19.7") and December the driest (2.6").