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Weather & Climate in Koseda, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Koseda enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 46°F in January while summers reach 76°F in July. The area gets 128 sunny days per year, below the national average of 205. Annual precipitation totals 123.4 inches (wetter than the 38-inch national average). The city sits at an elevation of 151 feet.
Temperature
46°F Jan (8°C)
76°F Jul (24°C)
| Annual Average | 61.2°F |
| 13% above US avg | |
| January Average | 46°F (8°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 128 days/yr |
Geography
| Elevation | 151 ft (46 m) |
| Area | 1,400.4 sq mi (3,627.1 km²) |
| Population Density | 8/sq mi |
| Coordinates | 30.3880°N, 130.6492°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
854 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.6.
| Oct 18, 1996 | 20 km SSE of Nishinoomote, Japan | M6.6 | 47 km | 10 km |
| Jan 24, 1999 | 15 km SSE of Nishinoomote, Japan | M6.4 | 49 km | 33 km |
| Jun 6, 2000 | 124 km SE of Koshima, Japan | M6.4 | 131 km | 33 km |
| Jan 8, 2019 | 16 km SSE of Nishinoomote, Japan | M6.3 | 44 km | 35 km |
| Sep 3, 2009 | 32 km WSW of Makurazaki, Japan | M6.2 | 103 km | 163 km |
| Feb 17, 1990 | 80 km SSE of Koshima, Japan | M6.1 | 95 km | 66 km |
| Sep 13, 1994 | 110 km NNE of Naze, Japan | M6.1 | 142 km | 34 km |
| Apr 2, 2025 | 56 km ENE of Nishinoomote, Japan | M6.1 | 106 km | 29 km |
| Dec 16, 1998 | 22 km S of Kushima, Japan | M6.0 | 117 km | 42 km |
| Jun 25, 2000 | 33 km S of Kushima, Japan | M6.0 | 103 km | 10 km |
| Apr 9, 2011 | 110 km SE of Nishinoomote, Japan | M5.9 | 117 km | 11 km |
| Apr 30, 1994 | 8 km SSE of Kushima, Japan | M5.9 | 130 km | 26 km |
| Sep 23, 1992 | 17 km SSW of Makurazaki, Japan | M5.8 | 92 km | 161 km |
| Sep 13, 2024 | 59 km SE of Koshima, Japan | M5.7 | 69 km | 30 km |
| Sep 9, 1996 | 8 km NE of Koseda, Japan | M5.7 | 9 km | 33 km |
| Apr 29, 2017 | 40 km ENE of Nishinoomote, Japan | M5.7 | 87 km | 31 km |
| Aug 16, 1994 | 100 km SSW of Yudomari, Japan | M5.7 | 122 km | 39 km |
| May 31, 2005 | 10 km SSW of Kushima, Japan | M5.7 | 124 km | 34 km |
| May 15, 2019 | 59 km SSE of Koshima, Japan | M5.7 | 74 km | 29 km |
| Apr 23, 1992 | 119 km SE of Koshima, Japan | M5.7 | 127 km | 40 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
83 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 | 54 km |
| 2024 | Bebinca | Category 1 | 75 mph | 297 km |
| 2022 | Nanmadol | Category 4 | 115 mph | 5 km |
| 2020 | Haishen | Category 3 | 104 mph | 94 km |
| 2020 | Chan-hom | Category 1 | 81 mph | 264 km |
| 2019 | Francisco | Category 1 | 81 mph | 197 km |
| 2018 | Jebi | Category 3 | 104 mph | 207 km |
| 2018 | Soulik | Category 3 | 98 mph | 175 km |
| 2018 | Trami | Category 2 | 98 mph | 27 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 266 km |
| 2017 | Saola | Category 1 | 69 mph | 247 km |
| 2017 | Noru | Category 1 | 92 mph | 5 km |
| 2016 | Malakas | Category 3 | 109 mph | 91 km |
| 2016 | Namtheun | Category 3 | 81 mph | 63 km |
| 2015 | Goni | Category 4 | 115 mph | 113 km |
| 2014 | Phanfone | Category 3 | 104 mph | 112 km |
| 2014 | Halong | Category 1 | 86 mph | 150 km |
| 2012 | Sanba | Category 3 | 104 mph | 265 km |
| 2012 | Jelawat | Category 2 | 104 mph | 201 km |
| 2012 | Guchol | Category 1 | 86 mph | 137 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
7 tsunamis recorded within 500 km. Highest wave on record: 6.0 m (20 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1780 | SW. KYUSHU ISLAND | Astronomical | 6.0 m | - | 135 km |
| 1914 | SEIKAIDO | Eruption | 3.0 m | 63 | 133 km |
| 1996 | KYUSHU ISLAND | Earthquake | 0.2 m | - | 47 km |
| 1961 | RYUKYU ISLANDS | Earthquake | 0.2 m | - | 141 km |
| 1781 | SW. KYUSHU ISLAND | Astronomical | - | 38 | 133 km |
| 1780 | SW. KYUSHU ISLAND | Astronomical | - | - | 135 km |
| 766 | N. KAGOSHIMA BAY | Astronomical | - | - | 135 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
10 volcanoes within 200 km. Closest: Kuchinoerabujima (42 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Kuchinoerabujima | Stratovolcano(es) | 657 m (2,156 ft) | 2020 | 42 km |
| Kikai | Caldera | 704 m (2,310 ft) | 2020 | 56 km |
| Kuchinoshima | Stratovolcano(es) | 628 m (2,060 ft) | 1190 | 84 km |
| Ata | Caldera(s) | 924 m (3,031 ft) | 885 | 93 km |
| Nakanoshima | Stratovolcano(es) | 979 m (3,212 ft) | 1914 | 96 km |
| Suwanosejima | Stratovolcano(es) | 796 m (2,612 ft) | 2020 | 123 km |
| Aira | Caldera | 1,117 m (3,665 ft) | 2020 | 134 km |
| Akusekijima | Stratovolcano(es) | 555 m (1,821 ft) | Unknown | 145 km |
| Yonemaru-Sumiyoshiike | Maar(s) | 40 m (131 ft) | -6200 | 154 km |
| Kirishimayama | Shield | 1,700 m (5,577 ft) | 2018 | 173 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 46°F (8°C) | 6.1 in | Coldest |
| February | 47°F (8°C) | 7.1 in | |
| March | 52°F (11°C) | 9.4 in | |
| April | 59°F (15°C) | 11.0 in | |
| May | 64°F (18°C) | 14.4 in | |
| June | 70°F (21°C) | 19.8 in | Wettest |
| July | 76°F (24°C) | 12.3 in | |
| August | 76°F (25°C) | 11.5 in | Warmest |
| September | 73°F (23°C) | 11.2 in | |
| October | 66°F (19°C) | 7.8 in | |
| November | 58°F (14°C) | 7.0 in | |
| December | 50°F (10°C) | 5.6 in | Driest |
Koseda has a seasonal temperature swing of 31°F / from 46°F in January to 76°F in August. Total annual precipitation is 123.4 inches, with June being the wettest month (19.8") and December the driest (5.6").