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Weather & Climate in Onagawa Chō, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Onagawa Chō experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 33°F in January while summers reach 69°F in July. The area gets 254 sunny days per year, above the national average. Annual precipitation totals 45.2 inches. The area receives 3.3 inches of snow annually. The city sits at an elevation of 13 feet.
Temperature
33°F Jan (1°C)
69°F Jul (21°C)
| Annual Average | 51.7°F |
| 4% below US avg | |
| January Average | 33°F (1°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 254 days/yr |
Geography
| Elevation | 13 ft (4 m) |
| Area | 25.2 sq mi (65.3 km²) |
| Population Density | 255/sq mi |
| Coordinates | 38.4466°N, 141.4479°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
2,976 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M9.1.
| Mar 11, 2011 | 2011 Great Tohoku Earthquake, Japan | M9.1 | 82 km | 29 km |
| Mar 9, 2011 | 120 km SE of ?funato, Japan | M7.3 | 121 km | 32 km |
| Mar 16, 2022 | 57 km ENE of Namie, Japan | M7.3 | 82 km | 41 km |
| Apr 7, 2011 | 29 km ESE of Ishinomaki, Japan | M7.1 | 23 km | 42 km |
| Feb 13, 2021 | 73 km ENE of Namie, Japan | M7.1 | 85 km | 44 km |
| May 26, 2003 | 27 km SSW of ?funato, Japan | M7.0 | 46 km | 68 km |
| Oct 31, 2003 | 133 km ESE of Ishinomaki, Japan | M7.0 | 124 km | 10 km |
| Jul 19, 2008 | 107 km E of Namie, Japan | M7.0 | 120 km | 22 km |
| Mar 20, 2021 | 30 km E of Ishinomaki, Japan | M7.0 | 17 km | 43 km |
| May 1, 2021 | 30 km SSE of Onagawa Ch?, Japan | M6.9 | 30 km | 43 km |
| Jun 13, 2008 | 24 km WSW of Mizusawa, Japan | M6.9 | 81 km | 8 km |
| May 12, 2015 | 32 km SE of ?funato, Japan | M6.8 | 72 km | 35 km |
| Feb 16, 1996 | 123 km E of Namie, Japan | M6.7 | 147 km | 41 km |
| Mar 11, 2011 | 50 km ESE of ?tsuchi, Japan | M6.6 | 125 km | 26 km |
| Mar 12, 2011 | 146 km E of Namie, Japan | M6.5 | 142 km | 20 km |
| Mar 9, 2011 | 128 km SE of ?funato, Japan | M6.5 | 120 km | 15 km |
| Mar 14, 2010 | 59 km ENE of Namie, Japan | M6.5 | 79 km | 32 km |
| Dec 2, 2001 | 3 km NW of Hanamaki, Japan | M6.5 | 111 km | 124 km |
| Nov 3, 2002 | 30 km SE of ?funato, Japan | M6.4 | 67 km | 39 km |
| Aug 4, 2019 | 61 km ENE of Namie, Japan | M6.3 | 78 km | 38 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
18 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Ampil | Category 3 | 98 mph | 298 km |
| 2024 | Jebi | Category 1 | 75 mph | 229 km |
| 2019 | Faxai | Category 2 | 92 mph | 157 km |
| 2019 | Hagibis | Category 1 | 75 mph | 41 km |
| 2005 | Mawar | Category 1 | 58 mph | 241 km |
| 2004 | Ma-on | Category 2 | 63 mph | 182 km |
| 2002 | Higos | Category 1 | 75 mph | 63 km |
| 2001 | Danas | Category 1 | 63 mph | 246 km |
| 2000 | Sonamu | Category 1 | 63 mph | 228 km |
| 2000 | Kirogi | Category 1 | 69 mph | 87 km |
| 1998 | Vicki | Category 1 | 58 mph | 178 km |
| 1998 | Stella | Category 1 | 63 mph | 294 km |
| 1996 | Violet | Category 1 | 81 mph | 179 km |
| 1996 | Dan | Category 1 | 52 mph | 300 km |
| 1995 | Oscar | Category 3 | 98 mph | 250 km |
| 1993 | Vernon | Category 1 | 69 mph | 139 km |
| 1981 | Thad | Category 1 | — | 297 km |
| 1981 | Gay | Category 1 | 75 mph | 259 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
20 tsunamis recorded within 500 km. Highest wave on record: 39.3 m (129 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2011 | HONSHU ISLAND | Earthquake | 39.3 m | 18,423 | 82 km |
| 1835 | SANRIKU | Earthquake | 5.0 m | — | 73 km |
| 1861 | OFF MIYAGI | Earthquake | 3.9 m | — | 48 km |
| 2008 | ARATOZAWA, JAPAN | Eruption + Earthquake | 2.5 m | 23 | 81 km |
| 1846 | SANRIKU | Earthquake | 2.0 m | — | 148 km |
| 2016 | E. COAST HONSHU ISLAND | Earthquake | 1.4 m | — | 117 km |
| 1938 | OFF FUKUSHIMA PREFECTURE | Earthquake | 1.3 m | — | 110 km |
| 1962 | SANRIKU | Earthquake | 1.0 m | — | 120 km |
| 1915 | SANRIKU | Earthquake | 1.0 m | — | 128 km |
| 1897 | SANRIKU | Earthquake | 1.0 m | — | 55 km |
| 1804 | NW. HONSHU ISLAND | Earthquake | 1.0 m | 450 | 146 km |
| 1959 | SANRIKU | Earthquake | 0.8 m | — | 124 km |
| 1936 | SANRIKU | Earthquake | 0.7 m | — | 71 km |
| 2011 | HONSHU ISLAND | Earthquake | 0.6 m | — | 121 km |
| 1978 | SANRIKU | Earthquake | 0.6 m | 28 | 58 km |
| 1938 | SANRIKU | Earthquake | 0.6 m | — | 140 km |
| 1981 | E. HONSHU ISLAND | Earthquake | 0.4 m | — | 115 km |
| 2003 | E. HONSHU ISLAND | Earthquake | 0.3 m | — | 124 km |
| 2022 | OFF FUKUSHIMA PREFECTURE | Earthquake | 0.3 m | 4 | 82 km |
| 2008 | OFF EAST COAST OF HONSHU ISLAND | Earthquake | 0.2 m | — | 120 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
13 volcanoes within 200 km. Closest: Naruko (70 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Naruko | Caldera | 470 m (1,542 ft) | 837 | 70 km |
| Kurikomayama | Stratovolcano | 1,627 m (5,338 ft) | 1950 | 81 km |
| Zaozan [Zaosan] | Complex | 1,841 m (6,040 ft) | 1940 | 94 km |
| Azumayama | Stratovolcano(es) | 1,949 m (6,394 ft) | 1977 | 132 km |
| Adatarayama | Stratovolcano(es) | 1,728 m (5,669 ft) | 1996 | 135 km |
| Chokaisan | Stratovolcano(es) | 2,236 m (7,336 ft) | 1974 | 141 km |
| Bandaisan | Stratovolcano | 1,816 m (5,958 ft) | 1888 | 153 km |
| Akita-Komagatake | Stratovolcano(es) | 1,637 m (5,371 ft) | 1971 | 157 km |
| Iwatesan | Complex | 2,038 m (6,686 ft) | 1919 | 161 km |
| Hachimantai | Stratovolcano | 1,613 m (5,292 ft) | -5350 | 176 km |
| Akita-Yakeyama | Stratovolcano | 1,366 m (4,482 ft) | 1997 | 179 km |
| Nasudake | Stratovolcano(es) | 1,915 m (6,283 ft) | 1963 | 197 km |
| Numazawa | Shield | 835 m (2,740 ft) | -3400 | 199 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 33°F (1°C) | 1.4 in | Coldest |
| February | 33°F (1°C) | 1.9 in | |
| March | 38°F (3°C) | 2.8 in | |
| April | 48°F (9°C) | 4.0 in | |
| May | 56°F (13°C) | 4.3 in | |
| June | 62°F (17°C) | 4.9 in | |
| July | 69°F (21°C) | 5.3 in | |
| August | 73°F (23°C) | 5.3 in | Warmest |
| September | 67°F (19°C) | 6.5 in | Wettest |
| October | 57°F (14°C) | 4.8 in | |
| November | 47°F (8°C) | 2.7 in | |
| December | 38°F (4°C) | 1.3 in | Driest |
Onagawa Chō has a seasonal temperature swing of 40°F / from 33°F in January to 73°F in August. Total annual precipitation is 45.2 inches, with September being the wettest month (6.5") and December the driest (1.3").