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Weather & Climate in Hachijō, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hachijō enjoys a temperate climate with an average annual temperature of 65°F (18°C). Winters average 52°F in January while summers reach 77°F in July. The area gets 150 sunny days per year, below the national average of 205. Annual precipitation totals 103.2 inches (wetter than the 38-inch national average). The city sits at an elevation of 75 feet.
Temperature
52°F Jan (11°C)
77°F Jul (25°C)
| Annual Average | 65.0°F |
| 20% above US avg | |
| January Average | 52°F (11°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 150 days/yr |
Geography
| Elevation | 75 ft (23 m) |
| Area | 901.5 sq mi (2,334.9 km²) |
| Population Density | 8/sq mi |
| Coordinates | 33.1028°N, 139.7788°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
1,518 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.6.
| Aug 12, 2009 | 244 km SSE of Tateyama, Japan | M6.6 | 66 km | 53 km |
| Sep 23, 1990 | 153 km SSE of ?yama, Japan | M6.5 | 107 km | 10 km |
| Jul 30, 2000 | 94 km SSE of Shimoda, Japan | M6.5 | 96 km | 10 km |
| Sep 3, 1991 | 115 km S of Shimoda, Japan | M6.4 | 111 km | 27 km |
| Sep 23, 1990 | 162 km SSE of ?yama, Japan | M6.2 | 102 km | 10 km |
| Jul 1, 2000 | 53 km SSE of Shimoda, Japan | M6.1 | 138 km | 10 km |
| Jul 15, 2000 | near the south coast of Honshu, Japan | M6.1 | 144 km | 10 km |
| Oct 6, 1995 | 68 km S of Shimoda, Japan | M5.9 | 126 km | 33 km |
| Jul 8, 2000 | 71 km SSE of Shimoda, Japan | M5.9 | 122 km | 10 km |
| Jul 4, 2001 | 285 km S of Shimoda, Japan | M5.9 | 108 km | 33 km |
| Jul 29, 2019 | 246 km SSE of Tateyama, Japan | M5.8 | 79 km | 59 km |
| Jul 9, 2005 | 194 km SSE of Tateyama, Japan | M5.8 | 104 km | 55 km |
| May 14, 2023 | 156 km SSE of Shimoda, Japan | M5.8 | 45 km | 13 km |
| Jul 30, 2000 | 90 km SSE of Shimoda, Japan | M5.7 | 101 km | 10 km |
| Jul 5, 2001 | 284 km SSE of Shimoda, Japan | M5.7 | 106 km | 33 km |
| Mar 25, 2018 | 276 km SSE of Tateyama, Japan | M5.7 | 102 km | 50 km |
| Aug 18, 2000 | 64 km SSE of Shimoda, Japan | M5.7 | 127 km | 10 km |
| Mar 28, 2021 | 154 km SSE of Tateyama, Japan | M5.7 | 75 km | 40 km |
| Jul 2, 2000 | 71 km SSE of Shimoda, Japan | M5.7 | 120 km | 10 km |
| Jun 29, 2000 | 81 km SSE of Shimoda, Japan | M5.6 | 110 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
63 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Halong | Category 4 | — | 45 km |
| 2025 | Nakri | Category 1 | — | 49 km |
| 2024 | Ampil | Category 3 | 98 mph | 95 km |
| 2024 | Jebi | Category 1 | 75 mph | 176 km |
| 2023 | Lan | Category 2 | 86 mph | 258 km |
| 2021 | Mindulle | Category 2 | 98 mph | 162 km |
| 2019 | Faxai | Category 4 | 98 mph | 74 km |
| 2019 | Hagibis | Category 3 | 98 mph | 161 km |
| 2018 | Jongdari | Category 2 | 86 mph | 102 km |
| 2018 | Shanshan | Category 1 | 81 mph | 153 km |
| 2017 | Lan | Category 1 | 98 mph | 242 km |
| 2016 | Mindulle | Category 1 | 75 mph | 136 km |
| 2014 | Phanfone | Category 1 | 81 mph | 237 km |
| 2014 | Fengshen | Category 1 | 69 mph | 180 km |
| 2013 | Pabuk | Category 2 | 69 mph | 290 km |
| 2013 | Wipha | Category 1 | 81 mph | 97 km |
| 2011 | Sonca | Category 2 | 75 mph | 275 km |
| 2011 | Roke | Category 2 | 92 mph | 262 km |
| 2010 | Chaba | Category 1 | 75 mph | 154 km |
| 2009 | Krovanh | Category 1 | 69 mph | 46 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
16 tsunamis recorded within 500 km. Highest wave on record: 6.0 m (20 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1953 | MYOJINSHO SUBMARINE VOLCANO | Astronomical | 6.0 m | — | 136 km |
| 1972 | CHICHI JIMA | Earthquake | 0.5 m | — | 89 km |
| 1952 | MYOJINSHO SUBMARINE VOLCANO | Astronomical | 0.5 m | 31 | 136 km |
| 1972 | EAST OFF HACHIJO ISLAND | Earthquake | 0.4 m | — | 98 km |
| 1952 | MYOJINSHO SUBMARINE VOLCANO | Astronomical | 0.4 m | — | 136 km |
| 1952 | MYOJINSHO SUBMARINE VOLCANO | Astronomical | 0.3 m | — | 136 km |
| 1990 | W. OF BONIN ISLANDS, IZU IS., JAPAN | Earthquake | 0.2 m | — | 107 km |
| 1982 | S. OF HONSHU ISLAND | Earthquake | 0.2 m | — | 87 km |
| 2000 | HONSHU: S COAST | Earthquake | 0.1 m | — | 96 km |
| 2000 | KOZU-SHIMA ISLAND, HONSHU | Earthquake | 0.1 m | 1 | 138 km |
| 2000 | HONSHU: S COAST | Earthquake | 0.1 m | — | 144 km |
| 1953 | MYOJINSHO SUBMARINE VOLCANO | Astronomical | 0.1 m | — | 136 km |
| 1952 | MYOJINSHO SUBMARINE VOLCANO | Astronomical | — | — | 136 km |
| 1915 | MYOJINSHO SUBMARINE VOLCANO | Astronomical | — | — | 136 km |
| 1606 | CHICHIJIMA-TOKAIDO | Astronomical | — | — | 135 km |
| 1605 | ENSHUNADA | Earthquake | — | 1,001 | 127 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
11 volcanoes within 200 km. Closest: Hachijojima (4 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Hachijojima | Stratovolcano(es) | 854 m (2,802 ft) | 1606 | 4 km |
| Aogashima | Stratovolcano | 423 m (1,388 ft) | 1785 | 72 km |
| Mikurajima | Stratovolcano | 851 m (2,792 ft) | -4100 | 87 km |
| Kita-Bayonnaise | Submarine | -360 m (-1,181 ft) | Unknown | 112 km |
| Miyakejima | Stratovolcano | 775 m (2,543 ft) | 2010 | 113 km |
| Myojinsho | Submarine | 11 m (36 ft) | 1970 | 136 km |
| Kozushima | Lava dome(s) | 572 m (1,877 ft) | 838 | 137 km |
| Niijima | Lava dome(s) | 432 m (1,417 ft) | 886 | 151 km |
| Toshima | Stratovolcano | 508 m (1,667 ft) | -4550 | 164 km |
| Izu-Oshima | Stratovolcano | 758 m (2,487 ft) | 1990 | 184 km |
| Sumisujima | Submarine | 136 m (446 ft) | 1916 | 187 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 52°F (11°C) | 5.3 in | |
| February | 52°F (11°C) | 5.8 in | Coldest |
| March | 55°F (13°C) | 7.9 in | |
| April | 61°F (16°C) | 8.4 in | |
| May | 67°F (19°C) | 10.0 in | |
| June | 72°F (22°C) | 12.8 in | |
| July | 77°F (25°C) | 7.0 in | |
| August | 79°F (26°C) | 8.2 in | Warmest |
| September | 76°F (25°C) | 11.1 in | |
| October | 70°F (21°C) | 13.1 in | Wettest |
| November | 64°F (18°C) | 8.6 in | |
| December | 57°F (14°C) | 5.2 in | Driest |
Hachijō has a seasonal temperature swing of 27°F / from 52°F in February to 79°F in August. Total annual precipitation is 103.2 inches, with October being the wettest month (13.1") and December the driest (5.2").