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Weather & Climate in Hirokawa, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hirokawa enjoys a temperate climate with an average annual temperature of 60°F (15°C). Winters average 40°F in January while summers reach 79°F in July. The area gets 206 sunny days per year. Annual precipitation totals 73.1 inches (wetter than the 38-inch national average). The city sits at an elevation of 135 feet.
Temperature
40°F Jan (5°C)
79°F Jul (26°C)
| Annual Average | 59.8°F |
| 11% above US avg | |
| January Average | 40°F (5°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 206 days/yr |
Geography
| Elevation | 135 ft (41 m) |
| Area | 17.9 sq mi (46.4 km²) |
| Population Density | 1,115/sq mi |
| Coordinates | 33.2429°N, 130.5521°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
275 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 | 54 km | 10 km |
| Mar 20, 2005 | 28 km NNW of Maebaru-ch??, Japan | M6.6 | 74 km | 10 km |
| Jun 11, 2006 | 15 km S of Tsukawaki, Japan | M6.3 | 57 km | 140 km |
| Mar 13, 2014 | 32 km SSW of Hikari, Japan | M6.3 | 128 km | 79 km |
| Jan 21, 2022 | 27 km SSE of Saiki, Japan | M6.3 | 150 km | 39 km |
| Apr 14, 2016 | 2 km SSE of Kumamoto, Japan | M6.2 | 53 km | 9 km |
| Mar 26, 1997 | 16 km NE of Satsumasendai, Japan | M6.1 | 148 km | 10 km |
| Apr 14, 2016 | 5 km ENE of Uto, Japan | M6.0 | 63 km | 8 km |
| Apr 15, 2016 | 6 km S of Kikuchi, Japan | M5.7 | 43 km | 10 km |
| Apr 25, 2001 | 18 km SE of Saiki, Japan | M5.7 | 145 km | 33 km |
| May 22, 1998 | 9 km NE of Bungo-Takada-shi, Japan | M5.5 | 99 km | 81 km |
| Apr 15, 2016 | 10 km NE of Aso, Japan | M5.5 | 62 km | 13 km |
| Jul 12, 2015 | 12 km SSW of Usuki, Japan | M5.5 | 114 km | 53 km |
| Apr 18, 2016 | 8 km NNE of Aso, Japan | M5.5 | 57 km | 10 km |
| Apr 19, 2005 | 8 km NNW of Maebaru-ch??, Japan | M5.5 | 56 km | 19 km |
| Nov 4, 2002 | Kyushu, Japan | M5.4 | 133 km | 33 km |
| Apr 15, 2016 | 5 km WSW of Aso, Japan | M5.4 | 57 km | 4 km |
| Feb 12, 1994 | 4 km WSW of ?kuchi-shinohara, Japan | M5.4 | 132 km | 31 km |
| Apr 14, 2016 | 14 km ESE of Kumamoto, Japan | M5.4 | 61 km | 10 km |
| Apr 14, 2016 | 4 km NNE of Uto, Japan | M5.3 | 60 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
62 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Shanshan | Category 2 | 104 mph | 86 km |
| 2022 | Nanmadol | Category 2 | 104 mph | 15 km |
| 2022 | Hinnamnor | Category 1 | 81 mph | 251 km |
| 2020 | Haishen | Category 2 | 98 mph | 138 km |
| 2020 | Maysak | Category 2 | 92 mph | 234 km |
| 2019 | Francisco | Category 1 | 81 mph | 38 km |
| 2018 | Trami | Category 1 | 98 mph | 241 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 140 km |
| 2017 | Noru | Category 1 | 69 mph | 229 km |
| 2016 | Malakas | Category 3 | 92 mph | 203 km |
| 2016 | Chaba | Category 1 | 75 mph | 261 km |
| 2016 | Namtheun | Category 1 | 69 mph | 279 km |
| 2015 | Goni | Category 3 | 104 mph | 51 km |
| 2014 | Halong | Category 1 | 86 mph | 248 km |
| 2013 | Danas | Category 1 | 75 mph | 197 km |
| 2012 | Sanba | Category 3 | 104 mph | 246 km |
| 2011 | Ma-on | Category 1 | 86 mph | 243 km |
| 2007 | Usagi | Category 3 | 104 mph | 75 km |
| 2007 | Man-yi | Category 2 | 86 mph | 178 km |
| 2006 | Shanshan | Category 2 | 98 mph | 84 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
8 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 | 60 km |
| 1596 | BEPPU BAY, KYUSHU | Eruption + Earthquake | 8.0 m | 708 | 107 km |
| 1828 | AMAKUSA SEA | Earthquake | - | - | 94 km |
| 1715 | SEIKAIDO | Earthquake | - | - | 107 km |
| 1698 | SEIKAIDO-NANKAIDO | Earthquake | - | - | 107 km |
| 1619 | YATSUSHIRO, JAPAN | Earthquake | - | - | 83 km |
| 1597 | BEPPU BAY, JAPAN | Eruption + Earthquake | - | 40 | 98 km |
| 744 | SW. KYUSHU ISLAND | Earthquake | - | 1,520 | 94 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
9 volcanoes within 200 km. Closest: Unzendake (59 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Unzendake | Complex | 1,483 m (4,865 ft) | 1996 | 59 km |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 65 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 67 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 78 km |
| Kirishimayama | Shield | 1,700 m (5,577 ft) | 2018 | 148 km |
| Yonemaru-Sumiyoshiike | Maar(s) | 40 m (131 ft) | -6200 | 164 km |
| Abu | Shield(s) | 641 m (2,103 ft) | -6850 | 170 km |
| Fukue | Shield(s) | 315 m (1,033 ft) | -400 | 172 km |
| Aira | Caldera | 1,117 m (3,665 ft) | 2020 | 184 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (5°C) | 2.4 in | Coldest |
| February | 42°F (5°C) | 3.1 in | |
| March | 48°F (9°C) | 4.5 in | |
| April | 57°F (14°C) | 6.1 in | |
| May | 65°F (18°C) | 6.9 in | |
| June | 72°F (22°C) | 13.3 in | |
| July | 79°F (26°C) | 13.4 in | Wettest |
| August | 80°F (27°C) | 7.3 in | Warmest |
| September | 74°F (23°C) | 7.6 in | |
| October | 64°F (18°C) | 3.7 in | |
| November | 54°F (12°C) | 2.7 in | |
| December | 44°F (7°C) | 2.2 in | Driest |
Hirokawa has a seasonal temperature swing of 40°F / from 40°F in January to 80°F in August. Total annual precipitation is 73.1 inches, with July being the wettest month (13.4") and December the driest (2.2").