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Weather & Climate in Koshima, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Koshima enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 44°F in January while summers reach 74°F in July. The area gets 125 sunny days per year, below the national average of 205. Annual precipitation totals 127.1 inches (wetter than the 38-inch national average). The city sits at an elevation of 161 feet.
Temperature
44°F Jan (6°C)
74°F Jul (23°C)
| Annual Average | 59.2°F |
| 10% above US avg | |
| January Average | 44°F (6°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 125 days/yr |
Geography
| Elevation | 161 ft (49 m) |
| Area | 1,400.4 sq mi (3,627.1 km²) |
| Population Density | 1/sq mi |
| Coordinates | 30.2346°N, 130.5352°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
979 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.8.
| Oct 30, 2009 | 98 km NNE of Naze, Japan | M6.8 | 134 km | 34 km |
| Oct 18, 1996 | 20 km SSE of Nishinoomote, Japan | M6.6 | 65 km | 10 km |
| Jan 24, 1999 | 15 km SSE of Nishinoomote, Japan | M6.4 | 68 km | 33 km |
| Jun 6, 2000 | 124 km SE of Koshima, Japan | M6.4 | 124 km | 33 km |
| Jan 8, 2019 | 16 km SSE of Nishinoomote, Japan | M6.3 | 63 km | 35 km |
| Sep 3, 2009 | 32 km WSW of Makurazaki, Japan | M6.2 | 112 km | 163 km |
| Apr 2, 2025 | 56 km ENE of Nishinoomote, Japan | M6.1 | 126 km | 29 km |
| Feb 17, 1990 | 80 km SSE of Koshima, Japan | M6.1 | 80 km | 66 km |
| Sep 13, 1994 | 110 km NNE of Naze, Japan | M6.1 | 121 km | 34 km |
| Dec 16, 1998 | 22 km S of Kushima, Japan | M6.0 | 137 km | 42 km |
| Jun 25, 2000 | 33 km S of Kushima, Japan | M6.0 | 123 km | 10 km |
| Apr 15, 2024 | 147 km SE of Koshima, Japan | M5.9 | 148 km | 8 km |
| Apr 9, 2011 | 110 km SE of Nishinoomote, Japan | M5.9 | 123 km | 11 km |
| Oct 2, 2000 | 119 km N of Naze, Japan | M5.8 | 141 km | 33 km |
| Sep 23, 1992 | 17 km SSW of Makurazaki, Japan | M5.8 | 104 km | 161 km |
| May 15, 2019 | 59 km SSE of Koshima, Japan | M5.7 | 60 km | 29 km |
| Apr 29, 2017 | 40 km ENE of Nishinoomote, Japan | M5.7 | 106 km | 31 km |
| Apr 23, 1992 | 119 km SE of Koshima, Japan | M5.7 | 120 km | 40 km |
| Oct 2, 2000 | 128 km N of Naze, Japan | M5.7 | 136 km | 33 km |
| Aug 7, 2000 | 149 km SSE of Koshima, Japan | M5.7 | 149 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
84 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Shanshan | Category 4 | 109 mph | 42 km |
| 2024 | Bebinca | Category 1 | 75 mph | 278 km |
| 2022 | Nanmadol | Category 4 | 115 mph | 16 km |
| 2020 | Haishen | Category 3 | 104 mph | 80 km |
| 2020 | Chan-hom | Category 1 | 81 mph | 275 km |
| 2019 | Francisco | Category 1 | 81 mph | 217 km |
| 2018 | Jebi | Category 3 | 104 mph | 218 km |
| 2018 | Soulik | Category 3 | 98 mph | 155 km |
| 2018 | Trami | Category 2 | 98 mph | 46 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 258 km |
| 2017 | Saola | Category 1 | 69 mph | 227 km |
| 2017 | Noru | Category 1 | 92 mph | 8 km |
| 2016 | Malakas | Category 3 | 109 mph | 102 km |
| 2016 | Namtheun | Category 3 | 81 mph | 49 km |
| 2015 | Goni | Category 4 | 115 mph | 107 km |
| 2014 | Phanfone | Category 4 | 109 mph | 109 km |
| 2014 | Halong | Category 1 | 86 mph | 155 km |
| 2012 | Sanba | Category 3 | 104 mph | 251 km |
| 2012 | Jelawat | Category 2 | 104 mph | 196 km |
| 2012 | Guchol | Category 1 | 86 mph | 140 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 0.2 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1996 | KYUSHU ISLAND | Earthquake | 0.2 m | - | 65 km |
| 1961 | RYUKYU ISLANDS | Earthquake | 0.2 m | - | 141 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
10 volcanoes within 200 km. Closest: Kuchinoerabujima (38 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Kuchinoerabujima | Stratovolcano(es) | 657 m (2,156 ft) | 2020 | 38 km |
| Kuchinoshima | Stratovolcano(es) | 628 m (2,060 ft) | 1190 | 66 km |
| Kikai | Caldera | 704 m (2,310 ft) | 2020 | 66 km |
| Nakanoshima | Stratovolcano(es) | 979 m (3,212 ft) | 1914 | 78 km |
| Suwanosejima | Stratovolcano(es) | 796 m (2,612 ft) | 2020 | 103 km |
| Ata | Caldera(s) | 924 m (3,031 ft) | 885 | 110 km |
| Akusekijima | Stratovolcano(es) | 555 m (1,821 ft) | Unknown | 125 km |
| Aira | Caldera | 1,117 m (3,665 ft) | 2020 | 152 km |
| Yonemaru-Sumiyoshiike | Maar(s) | 40 m (131 ft) | -6200 | 171 km |
| Kirishimayama | Shield | 1,700 m (5,577 ft) | 2018 | 192 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 44°F (6°C) | 6.0 in | Coldest |
| February | 45°F (7°C) | 7.2 in | |
| March | 50°F (10°C) | 9.7 in | |
| April | 57°F (14°C) | 11.4 in | |
| May | 62°F (17°C) | 15.0 in | |
| June | 68°F (20°C) | 20.6 in | Wettest |
| July | 74°F (23°C) | 13.3 in | |
| August | 74°F (23°C) | 12.2 in | Warmest |
| September | 71°F (22°C) | 11.5 in | |
| October | 64°F (18°C) | 7.8 in | |
| November | 56°F (13°C) | 7.1 in | |
| December | 48°F (9°C) | 5.4 in | Driest |
Koshima has a seasonal temperature swing of 31°F / from 44°F in January to 74°F in August. Total annual precipitation is 127.1 inches, with June being the wettest month (20.6") and December the driest (5.4").