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Weather & Climate in Minamibōsō, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Minamibōsō enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 42°F in January while summers reach 75°F in July. The area gets 208 sunny days per year. Annual precipitation totals 70.5 inches (wetter than the 38-inch national average). The city sits at an elevation of 217 feet.
Temperature
42°F Jan (6°C)
75°F Jul (24°C)
| Annual Average | 59.3°F |
| 10% above US avg | |
| January Average | 42°F (6°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 208 days/yr |
Geography
| Elevation | 217 ft (66 m) |
| Area | 714.9 sq mi (1,851.5 km²) |
| Population Density | 50/sq mi |
| Coordinates | 35.0313°N, 139.9265°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
2,888 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 | 135 km | 10 km |
| Feb 20, 1990 | 28 km E of Shimoda, Japan | M6.4 | 71 km | 14 km |
| Jun 1, 1990 | near the east coast of Honshu, Japan | M6.3 | 66 km | 67 km |
| Apr 11, 2011 | 23 km SE of T?gane, Japan | M6.2 | 73 km | 15 km |
| Sep 11, 1996 | 23 km SSE of Hasaki, Japan | M6.2 | 108 km | 55 km |
| Jun 3, 2000 | 6 km SE of Narut?, Japan | M6.2 | 76 km | 62 km |
| Apr 21, 2011 | 6 km WNW of T?gane, Japan | M6.2 | 70 km | 43 km |
| Jun 5, 2012 | 75 km ESE of ?hara, Japan | M6.1 | 110 km | 15 km |
| May 26, 2023 | 12 km SE of Narutō, Japan | M6.1 | 78 km | 42 km |
| Jul 1, 2000 | 53 km SSE of Shimoda, Japan | M6.1 | 116 km | 10 km |
| Jul 15, 2000 | near the south coast of Honshu, Japan | M6.1 | 100 km | 10 km |
| Nov 20, 1996 | 115 km SE of Katsuura, Japan | M6.1 | 134 km | 33 km |
| May 4, 2014 | 31 km ESE of It?, Japan | M6.0 | 48 km | 153 km |
| Aug 6, 1991 | 19 km E of Hasaki, Japan | M6.0 | 127 km | 29 km |
| Mar 15, 2011 | 6 km NNW of Fujinomiya, Japan | M6.0 | 125 km | 9 km |
| Mar 14, 2012 | 5 km SE of Asahi, Japan | M6.0 | 101 km | 10 km |
| Mar 11, 2011 | 4 km ESE of Hasaki, Japan | M6.0 | 115 km | 48 km |
| Jan 15, 2007 | 15 km WSW of Heda, Japan | M5.9 | 118 km | 170 km |
| Apr 10, 2005 | near the east coast of Honshu, Japan | M5.9 | 77 km | 43 km |
| Oct 6, 1995 | 68 km S of Shimoda, Japan | M5.9 | 132 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
47 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Halong | Category 3 | — | 249 km |
| 2025 | Nakri | Category 1 | — | 218 km |
| 2024 | Ampil | Category 3 | 98 mph | 149 km |
| 2024 | Jebi | Category 1 | 75 mph | 209 km |
| 2021 | Mindulle | Category 1 | 92 mph | 263 km |
| 2019 | Faxai | Category 4 | 98 mph | 31 km |
| 2019 | Hagibis | Category 2 | 92 mph | 79 km |
| 2018 | Jongdari | Category 2 | 86 mph | 124 km |
| 2018 | Shanshan | Category 1 | 81 mph | 110 km |
| 2016 | Mindulle | Category 1 | 75 mph | 90 km |
| 2016 | Lionrock | Category 1 | 81 mph | 261 km |
| 2014 | Phanfone | Category 1 | 81 mph | 140 km |
| 2013 | Wipha | Category 1 | 81 mph | 269 km |
| 2011 | Roke | Category 2 | 92 mph | 117 km |
| 2009 | Krovanh | Category 1 | 69 mph | 170 km |
| 2007 | Fitow | Category 1 | 81 mph | 91 km |
| 2005 | Saola | Category 2 | 86 mph | 206 km |
| 2005 | Mawar | Category 2 | 86 mph | 32 km |
| 2004 | Ma-on | Category 4 | 92 mph | 60 km |
| 2003 | Choi-wan | Category 3 | 81 mph | 216 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 | 40 km |
| 1703 | OFF SW BOSO PENINSULA | Earthquake | 11.7 m | 5,233 | 39 km |
| 1677 | OFF SE. BOSO PENINSULA | Earthquake | 8.0 m | 500 | 143 km |
| 1495 | KAMAKURA, SAGAMI BAY, TOKAIDO | Earthquake | 5.0 m | 200 | 40 km |
| 1732 | KUJUKURI BEACH, JAPAN | Earthquake | 2.0 m | — | 82 km |
| 1670 | BOSO, JAPAN | Earthquake | 2.0 m | — | 111 km |
| 1433 | OFF IZU-OSHIMA | Earthquake | 2.0 m | — | 42 km |
| 1980 | HONSHU ISLAND | Earthquake | 0.6 m | — | 72 km |
| 1978 | TOKAIDO | Earthquake | 0.4 m | 25 | 66 km |
| 1923 | RYUKYU ISLANDS | Earthquake | 0.3 m | — | 29 km |
| 1974 | TOKAIDO | Earthquake | 0.2 m | 30 | 122 km |
| 1982 | S. OF HONSHU ISLAND | Earthquake | 0.2 m | — | 141 km |
| 1990 | JAPAN | Earthquake | 0.2 m | — | 71 km |
| 2000 | HONSHU: S COAST | Earthquake | 0.1 m | — | 135 km |
| 2000 | HONSHU: S COAST | Earthquake | 0.1 m | — | 100 km |
| 2000 | KOZU-SHIMA ISLAND, HONSHU | Earthquake | 0.1 m | 1 | 116 km |
| 1855 | TOKAIDO | Earthquake | — | 6,757 | 70 km |
| 1782 | ODAWARA, SAGAMI BAY | Eruption + Earthquake | — | — | 22 km |
| 1642 | BOSO, JAPAN | Earthquake | — | — | 64 km |
| 1633 | SAGAMI BAY | Earthquake | — | 150 | 69 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Izu-Oshima (59 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Izu-Oshima | Stratovolcano | 758 m (2,487 ft) | 1990 | 59 km |
| Izu-Tobu | Pyroclastic cone(s) | 1,406 m (4,613 ft) | 1989 | 77 km |
| Toshima | Stratovolcano | 508 m (1,667 ft) | -4550 | 82 km |
| Hakoneyama | Complex | 1,438 m (4,718 ft) | 2015 | 85 km |
| Niijima | Lava dome(s) | 432 m (1,417 ft) | 886 | 93 km |
| Miyakejima | Stratovolcano | 775 m (2,543 ft) | 2010 | 111 km |
| Kozushima | Lava dome(s) | 572 m (1,877 ft) | 838 | 115 km |
| Fujisan | Stratovolcano | 3,776 m (12,388 ft) | 1708 | 115 km |
| Mikurajima | Stratovolcano | 851 m (2,792 ft) | -4100 | 132 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 182 km |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 187 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 188 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 197 km |
| Asamayama | Complex | 2,568 m (8,425 ft) | 2019 | 199 km |
| Omanago Group | Lava dome(s) | 2,341 m (7,680 ft) | -3050 | 200 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (6°C) | 2.9 in | Coldest |
| February | 42°F (6°C) | 3.7 in | |
| March | 47°F (8°C) | 6.1 in | |
| April | 56°F (14°C) | 6.1 in | |
| May | 63°F (17°C) | 6.2 in | |
| June | 69°F (21°C) | 8.5 in | |
| July | 75°F (24°C) | 5.4 in | |
| August | 78°F (26°C) | 6.0 in | Warmest |
| September | 73°F (23°C) | 8.7 in | Wettest |
| October | 64°F (18°C) | 8.7 in | |
| November | 55°F (13°C) | 5.4 in | |
| December | 47°F (8°C) | 2.7 in | Driest |
Minamibōsō has a seasonal temperature swing of 36°F / from 42°F in January to 78°F in August. Total annual precipitation is 70.5 inches, with September being the wettest month (8.7") and December the driest (2.7").