All Countries
Weather & Climate in Iwashita, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Iwashita enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 39°F in January while summers reach 78°F in July. The area gets 191 sunny days per year. Annual precipitation totals 87.6 inches (wetter than the 38-inch national average). The city sits at an elevation of 108 feet.
Temperature
39°F Jan (4°C)
78°F Jul (25°C)
| Annual Average | 59.0°F |
| 9% above US avg | |
| January Average | 39°F (4°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 191 days/yr |
Geography
| Elevation | 108 ft (33 m) |
| Area | 30.4 sq mi (78.7 km²) |
| Population Density | 334/sq mi |
| Coordinates | 32.6527°N, 130.8116°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
493 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.1.
| Aug 8, 2024 | 2024 Hyuganada Sea, Japan Earthquake | M7.1 | 119 km | 24 km |
| Apr 15, 2016 | 6 km ESE of Kumamoto, Japan | M7.0 | 16 km | 10 km |
| Jan 13, 2025 | 15 km SE of Miyazaki, Japan | M6.8 | 115 km | 39 km |
| Dec 2, 1996 | 17 km SW of Miyazaki, Japan | M6.7 | 107 km | 49 km |
| Oct 19, 1996 | 5 km SE of Miyazaki, Japan | M6.7 | 105 km | 22 km |
| Mar 20, 2005 | 28 km NNW of Maebaru-ch??, Japan | M6.6 | 143 km | 10 km |
| Jan 21, 2022 | 27 km SSE of Saiki, Japan | M6.3 | 115 km | 39 km |
| Mar 13, 2014 | 32 km SSW of Hikari, Japan | M6.3 | 149 km | 79 km |
| Jun 11, 2006 | 15 km S of Tsukawaki, Japan | M6.3 | 62 km | 140 km |
| May 9, 2019 | 43 km ESE of Miyazaki, Japan | M6.2 | 138 km | 22 km |
| Apr 14, 2016 | 2 km SSE of Kumamoto, Japan | M6.2 | 18 km | 9 km |
| Mar 26, 1997 | 16 km NE of Satsumasendai, Japan | M6.1 | 89 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 | 10 km | 8 km |
| Apr 30, 1994 | 8 km SSE of Kushima, Japan | M5.9 | 144 km | 26 km |
| Apr 5, 2009 | 10 km N of Miyazaki, Japan | M5.8 | 92 km | 26 km |
| Aug 28, 2014 | 53 km E of Takanabe, Japan | M5.8 | 134 km | 20 km |
| May 31, 2005 | 10 km SSW of Kushima, Japan | M5.7 | 144 km | 34 km |
| Apr 15, 2016 | 6 km S of Kikuchi, Japan | M5.7 | 30 km | 10 km |
| Oct 19, 1996 | 19 km ENE of Miyazaki, Japan | M5.7 | 108 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
65 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 | 51 km |
| 2022 | Nanmadol | Category 3 | 104 mph | 39 km |
| 2020 | Haishen | Category 3 | 104 mph | 165 km |
| 2020 | Maysak | Category 1 | 92 mph | 279 km |
| 2019 | Francisco | Category 1 | 81 mph | 34 km |
| 2018 | Jebi | Category 3 | 98 mph | 277 km |
| 2018 | Trami | Category 1 | 98 mph | 173 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 197 km |
| 2017 | Noru | Category 1 | 75 mph | 169 km |
| 2016 | Malakas | Category 3 | 109 mph | 134 km |
| 2016 | Namtheun | Category 1 | 75 mph | 223 km |
| 2015 | Goni | Category 3 | 104 mph | 42 km |
| 2014 | Phanfone | Category 2 | 98 mph | 270 km |
| 2014 | Halong | Category 1 | 86 mph | 212 km |
| 2013 | Danas | Category 1 | 69 mph | 245 km |
| 2012 | Sanba | Category 3 | 104 mph | 276 km |
| 2012 | Damrey | Category 1 | 63 mph | 272 km |
| 2011 | Ma-on | Category 1 | 86 mph | 200 km |
| 2007 | Usagi | Category 3 | 104 mph | 75 km |
| 2007 | Man-yi | Category 2 | 86 mph | 112 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 | 49 km |
| 1596 | BEPPU BAY, KYUSHU | Eruption + Earthquake | 8.0 m | 708 | 110 km |
| 1780 | SW. KYUSHU ISLAND | Astronomical | 6.0 m | — | 118 km |
| 1914 | SEIKAIDO | Eruption | 3.0 m | 63 | 120 km |
| 1769 | SW. KYUSHU ISLAND | Earthquake | 2.5 m | — | 118 km |
| 1941 | SEIKAIDO | Earthquake | 1.2 m | 2 | 141 km |
| 1939 | SEIKAIDO | Earthquake | 0.8 m | 1 | 118 km |
| 1931 | SEIKAIDO | Earthquake | 0.8 m | 1 | 131 km |
| 1961 | SEIKAIDO | Earthquake | 0.7 m | 2 | 150 km |
| 1996 | KYUSHU ISLAND | Earthquake | 0.6 m | — | 105 km |
| 2024 | HYUGANADA SEA | Earthquake | 0.5 m | — | 124 km |
| 1970 | SEIKAIDO | Earthquake | 0.3 m | — | 97 km |
| 1899 | SEIKAIDO | Earthquake | 0.3 m | — | 140 km |
| 2025 | HYUGANADA SEA | Earthquake | 0.2 m | — | 118 km |
| 1996 | SEA OF JAPAN | Earthquake | 0.2 m | — | 107 km |
| 1984 | KYUSHU, JAPAN | Earthquake | 0.2 m | — | 110 km |
| 1969 | RYUKYU ISLANDS | Earthquake | 0.1 m | — | 131 km |
| 1987 | KYUSHU ISLAND | Earthquake | 0.0 m | 2 | 118 km |
| 1899 | SEIKAIDO | Earthquake | — | — | 139 km |
| 1828 | AMAKUSA SEA | Earthquake | — | — | 86 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
9 volcanoes within 200 km. Closest: Asosan (38 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 38 km |
| Unzendake | Complex | 1,483 m (4,865 ft) | 1996 | 49 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 63 km |
| Kirishimayama | Shield | 1,700 m (5,577 ft) | 2018 | 80 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 88 km |
| Yonemaru-Sumiyoshiike | Maar(s) | 40 m (131 ft) | -6200 | 100 km |
| Aira | Caldera | 1,117 m (3,665 ft) | 2020 | 119 km |
| Ata | Caldera(s) | 924 m (3,031 ft) | 885 | 161 km |
| Fukue | Shield(s) | 315 m (1,033 ft) | -400 | 184 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 2.8 in | Coldest |
| February | 41°F (5°C) | 3.7 in | |
| March | 47°F (9°C) | 5.8 in | |
| April | 57°F (14°C) | 7.4 in | |
| May | 64°F (18°C) | 8.9 in | |
| June | 71°F (21°C) | 16.5 in | Wettest |
| July | 78°F (25°C) | 16.5 in | |
| August | 79°F (26°C) | 8.5 in | Warmest |
| September | 73°F (23°C) | 7.7 in | |
| October | 63°F (17°C) | 4.2 in | |
| November | 53°F (12°C) | 3.2 in | |
| December | 43°F (6°C) | 2.4 in | Driest |
Iwashita has a seasonal temperature swing of 40°F / from 39°F in January to 79°F in August. Total annual precipitation is 87.6 inches, with June being the wettest month (16.5") and December the driest (2.4").