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Weather & Climate in Ōshima, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ōshima enjoys a temperate climate with an average annual temperature of 60°F (15°C). Winters average 44°F in January while summers reach 74°F in July. The area gets 186 sunny days per year. Annual precipitation totals 82.4 inches (wetter than the 38-inch national average). The city sits at an elevation of 230 feet.
Temperature
44°F Jan (7°C)
74°F Jul (23°C)
| Annual Average | 59.5°F |
| 10% above US avg | |
| January Average | 44°F (7°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 186 days/yr |
Geography
| Elevation | 230 ft (70 m) |
| Area | 772.9 sq mi (2,001.7 km²) |
| Population Density | 9/sq mi |
| Coordinates | 34.7482°N, 139.3624°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
2,030 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.5.
| Jul 30, 2000 | 94 km SSE of Shimoda, Japan | M6.5 | 94 km | 10 km |
| Sep 3, 1991 | 115 km S of Shimoda, Japan | M6.4 | 134 km | 27 km |
| Feb 20, 1990 | 28 km E of Shimoda, Japan | M6.4 | 11 km | 14 km |
| Jun 1, 1990 | near the east coast of Honshu, Japan | M6.3 | 124 km | 67 km |
| Aug 10, 2009 | 8 km NE of Sagara, Japan | M6.2 | 100 km | 40 km |
| Apr 21, 2011 | 6 km WNW of T?gane, Japan | M6.2 | 126 km | 43 km |
| Jun 3, 2000 | 6 km SE of Narut?, Japan | M6.2 | 134 km | 62 km |
| Apr 11, 2011 | 23 km SE of T?gane, Japan | M6.2 | 133 km | 15 km |
| May 26, 2023 | 12 km SE of Narutō, Japan | M6.1 | 137 km | 42 km |
| Jul 1, 2000 | 53 km SSE of Shimoda, Japan | M6.1 | 62 km | 10 km |
| Jul 15, 2000 | near the south coast of Honshu, Japan | M6.1 | 49 km | 10 km |
| Mar 15, 2011 | 6 km NNW of Fujinomiya, Japan | M6.0 | 92 km | 9 km |
| May 4, 2014 | 31 km ESE of It?, Japan | M6.0 | 19 km | 153 km |
| Oct 6, 1995 | 68 km S of Shimoda, Japan | M5.9 | 80 km | 33 km |
| Jul 8, 2000 | 71 km SSE of Shimoda, Japan | M5.9 | 80 km | 10 km |
| Jul 23, 2005 | 9 km WSW of Ichihara, Japan | M5.9 | 101 km | 61 km |
| Apr 10, 2005 | near the east coast of Honshu, Japan | M5.9 | 134 km | 43 km |
| Aug 1, 2011 | 20 km E of ?yama, Japan | M5.9 | 86 km | 13 km |
| Jan 15, 2007 | 15 km WSW of Heda, Japan | M5.9 | 68 km | 170 km |
| Feb 1, 1992 | 4 km SSE of Miura, Japan | M5.8 | 47 km | 100 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
53 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Halong | Category 3 | — | 227 km |
| 2025 | Nakri | Category 1 | — | 203 km |
| 2024 | Ampil | Category 3 | 98 mph | 169 km |
| 2024 | Jebi | Category 1 | 75 mph | 253 km |
| 2021 | Mindulle | Category 1 | 92 mph | 294 km |
| 2019 | Faxai | Category 4 | 98 mph | 8 km |
| 2019 | Hagibis | Category 2 | 92 mph | 63 km |
| 2018 | Jongdari | Category 2 | 86 mph | 83 km |
| 2018 | Shanshan | Category 1 | 81 mph | 159 km |
| 2017 | Lan | Category 2 | 104 mph | 249 km |
| 2016 | Mindulle | Category 1 | 75 mph | 51 km |
| 2014 | Phanfone | Category 1 | 81 mph | 90 km |
| 2013 | Wipha | Category 1 | 81 mph | 223 km |
| 2011 | Roke | Category 2 | 92 mph | 129 km |
| 2010 | Chaba | Category 1 | 75 mph | 252 km |
| 2009 | Melor | Category 1 | 86 mph | 267 km |
| 2009 | Krovanh | Category 1 | 69 mph | 147 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 266 km |
| 2007 | Fitow | Category 1 | 81 mph | 43 km |
| 2005 | Saola | Category 2 | 86 mph | 223 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
20 tsunamis recorded within 500 km. Highest wave on record: 13.0 m (43 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1923 | SAGAMI BAY | Earthquake | 13.0 m | 105,385 | 41 km |
| 1703 | OFF SW BOSO PENINSULA | Earthquake | 11.7 m | 5,233 | 40 km |
| 1498 | ENSHUNADA SEA | Earthquake | 10.0 m | 5,000 | 143 km |
| 1495 | KAMAKURA, SAGAMI BAY, TOKAIDO | Earthquake | 5.0 m | 200 | 41 km |
| 1732 | KUJUKURI BEACH, JAPAN | Earthquake | 2.0 m | — | 140 km |
| 1433 | OFF IZU-OSHIMA | Earthquake | 2.0 m | — | 21 km |
| 2009 | HONSHU: S COAST | Earthquake | 0.6 m | 1 | 100 km |
| 1980 | HONSHU ISLAND | Earthquake | 0.6 m | — | 18 km |
| 1978 | TOKAIDO | Earthquake | 0.4 m | 25 | 12 km |
| 1923 | RYUKYU ISLANDS | Earthquake | 0.3 m | — | 78 km |
| 1974 | TOKAIDO | Earthquake | 0.2 m | 30 | 63 km |
| 1982 | S. OF HONSHU ISLAND | Earthquake | 0.2 m | — | 103 km |
| 1990 | JAPAN | Earthquake | 0.2 m | — | 11 km |
| 2000 | HONSHU: S COAST | Earthquake | 0.1 m | — | 94 km |
| 2000 | HONSHU: S COAST | Earthquake | 0.1 m | — | 49 km |
| 2000 | KOZU-SHIMA ISLAND, HONSHU | Earthquake | 0.1 m | 1 | 62 km |
| 1857 | TOKAIDO | Earthquake | — | — | 97 km |
| 1855 | TOKAIDO | Earthquake | — | 6,757 | 108 km |
| 1782 | ODAWARA, SAGAMI BAY | Eruption + Earthquake | — | — | 50 km |
| 1642 | BOSO, JAPAN | Earthquake | — | — | 123 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
13 volcanoes within 200 km. Closest: Izu-Oshima (4 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Izu-Oshima | Stratovolcano | 758 m (2,487 ft) | 1990 | 4 km |
| Toshima | Stratovolcano | 508 m (1,667 ft) | -4550 | 27 km |
| Izu-Tobu | Pyroclastic cone(s) | 1,406 m (4,613 ft) | 1989 | 30 km |
| Niijima | Lava dome(s) | 432 m (1,417 ft) | 886 | 40 km |
| Kozushima | Lava dome(s) | 572 m (1,877 ft) | 838 | 62 km |
| Hakoneyama | Complex | 1,438 m (4,718 ft) | 2015 | 62 km |
| Miyakejima | Stratovolcano | 775 m (2,543 ft) | 2010 | 74 km |
| Fujisan | Stratovolcano | 3,776 m (12,388 ft) | 1708 | 89 km |
| Mikurajima | Stratovolcano | 851 m (2,792 ft) | -4100 | 100 km |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 176 km |
| Hachijojima | Stratovolcano(es) | 854 m (2,802 ft) | 1606 | 183 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 198 km |
| Asamayama | Complex | 2,568 m (8,425 ft) | 2019 | 199 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 44°F (7°C) | 3.4 in | |
| February | 44°F (7°C) | 4.1 in | Coldest |
| March | 48°F (9°C) | 6.7 in | |
| April | 56°F (13°C) | 7.0 in | |
| May | 63°F (17°C) | 7.4 in | |
| June | 68°F (20°C) | 10.3 in | Wettest |
| July | 74°F (23°C) | 7.2 in | |
| August | 77°F (25°C) | 8.4 in | Warmest |
| September | 72°F (22°C) | 10.0 in | |
| October | 64°F (18°C) | 9.1 in | |
| November | 56°F (14°C) | 5.9 in | |
| December | 49°F (9°C) | 3.2 in | Driest |
Ōshima has a seasonal temperature swing of 33°F / from 44°F in February to 77°F in August. Total annual precipitation is 82.5 inches, with June being the wettest month (10.3") and December the driest (3.2").