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Weather & Climate in Nanyō, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Nanyō experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 29°F in January while summers reach 73°F in July. The area gets 237 sunny days per year, above the national average. Annual precipitation totals 54.5 inches (wetter than the 38-inch national average). The area receives 12.5 inches of snow annually. The city sits at an elevation of 696 feet.
Temperature
29°F Jan (-1°C)
73°F Jul (23°C)
| Annual Average | 51.8°F |
| 4% below US avg | |
| January Average | 29°F (-1°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 237 days/yr |
Geography
| Elevation | 696 ft (212 m) |
| Area | 84.1 sq mi (217.9 km²) |
| Population Density | 362/sq mi |
| Coordinates | 38.0432°N, 140.1128°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
1,410 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.3.
| Mar 16, 2022 | 57 km ENE of Namie, Japan | M7.3 | 134 km | 41 km |
| Apr 7, 2011 | 29 km ESE of Ishinomaki, Japan | M7.1 | 132 km | 42 km |
| Mar 20, 2021 | 30 km E of Ishinomaki, Japan | M7.0 | 142 km | 43 km |
| Jun 13, 2008 | 24 km WSW of Mizusawa, Japan | M6.9 | 129 km | 8 km |
| May 1, 2021 | 30 km SSE of Onagawa Ch?, Japan | M6.9 | 131 km | 43 km |
| Apr 11, 2011 | 17 km SSW of Ishikawa, Japan | M6.6 | 119 km | 11 km |
| Mar 14, 2010 | 59 km ENE of Namie, Japan | M6.5 | 134 km | 32 km |
| Jun 18, 2019 | 31 km WSW of Tsuruoka, Japan | M6.4 | 86 km | 12 km |
| Jul 24, 2011 | 43 km NE of Namie, Japan | M6.3 | 117 km | 40 km |
| Mar 11, 2011 | 30 km NNE of Namie, Japan | M6.3 | 101 km | 32 km |
| Aug 4, 2019 | 61 km ENE of Namie, Japan | M6.3 | 135 km | 38 km |
| Jul 30, 2011 | 13 km SSE of Iwaki, Japan | M6.3 | 143 km | 38 km |
| Aug 19, 2011 | 61 km ENE of Namie, Japan | M6.2 | 141 km | 47 km |
| Mar 12, 2011 | 55 km SE of Ishinomaki, Japan | M6.1 | 141 km | 15 km |
| May 13, 2011 | 31 km ESE of Namie, Japan | M6.1 | 130 km | 35 km |
| Mar 12, 2011 | 29 km SSE of Namie, Japan | M6.1 | 128 km | 38 km |
| Jul 25, 2003 | 7 km NW of Matsushima, Japan | M6.1 | 88 km | 6 km |
| May 18, 2013 | 50 km NE of Namie, Japan | M6.0 | 124 km | 39 km |
| Mar 11, 2011 | 17 km ESE of Namie, Japan | M6.0 | 116 km | 49 km |
| Aug 10, 1996 | 25 km NE of Shinj?, Japan | M6.0 | 103 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
16 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2019 | Faxai | Category 2 | 92 mph | 197 km |
| 2019 | Hagibis | Category 1 | 81 mph | 132 km |
| 2011 | Roke | Category 1 | 81 mph | 252 km |
| 2007 | Fitow | Category 1 | 75 mph | 284 km |
| 2005 | Mawar | Category 2 | 75 mph | 241 km |
| 2004 | Ma-on | Category 2 | 69 mph | 185 km |
| 2002 | Higos | Category 1 | 75 mph | 63 km |
| 2001 | Danas | Category 1 | 63 mph | 185 km |
| 2000 | Kirogi | Category 1 | 69 mph | 168 km |
| 1998 | Vicki | Category 2 | 63 mph | 80 km |
| 1998 | Stella | Category 1 | 63 mph | 208 km |
| 1996 | Violet | Category 1 | 81 mph | 256 km |
| 1995 | Ryan | Category 1 | 40 mph | 262 km |
| 1993 | Vernon | Category 1 | 75 mph | 154 km |
| 1981 | Thad | Category 1 | - | 227 km |
| 1981 | Gay | Category 1 | 75 mph | 276 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
12 tsunamis recorded within 500 km. Highest wave on record: 9.0 m (30 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1833 | NW. HONSHU ISLAND | Earthquake | 9.0 m | 85 | 127 km |
| 1964 | NW. HONSHU ISLAND | Earthquake | 5.8 m | 36 | 86 km |
| 2008 | ARATOZAWA, JAPAN | Eruption + Earthquake | 2.5 m | 23 | 129 km |
| 2016 | E. COAST HONSHU ISLAND | Earthquake | 1.4 m | - | 133 km |
| 1804 | NW. HONSHU ISLAND | Earthquake | 1.0 m | 450 | 113 km |
| 2022 | OFF FUKUSHIMA PREFECTURE | Earthquake | 0.3 m | 4 | 134 km |
| 2019 | NIIGATA | Earthquake | 0.1 m | - | 87 km |
| 2021 | OFF FUKUSHIMA PREFECTURE | Earthquake | 0.1 m | 1 | 147 km |
| 2011 | E. COAST HONSHU ISLAND | Earthquake | 0.1 m | 3 | 132 km |
| 1894 | YAMAGATA, JAPAN | Earthquake | - | 726 | 99 km |
| 1762 | NW. HONSHU ISLAND | Earthquake | - | - | 124 km |
| 850 | NW. HONSHU ISLAND | Eruption + Earthquake | - | - | 108 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Zaozan [Zaosan] (31 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Zaozan [Zaosan] | Complex | 1,841 m (6,040 ft) | 1940 | 31 km |
| Azumayama | Stratovolcano(es) | 1,949 m (6,394 ft) | 1977 | 36 km |
| Adatarayama | Stratovolcano(es) | 1,728 m (5,669 ft) | 1996 | 47 km |
| Bandaisan | Stratovolcano | 1,816 m (5,958 ft) | 1888 | 49 km |
| Numazawa | Shield | 835 m (2,740 ft) | -3400 | 82 km |
| Naruko | Caldera | 470 m (1,542 ft) | 837 | 94 km |
| Nasudake | Stratovolcano(es) | 1,915 m (6,283 ft) | 1963 | 103 km |
| Chokaisan | Stratovolcano(es) | 2,236 m (7,336 ft) | 1974 | 118 km |
| Kurikomayama | Stratovolcano | 1,627 m (5,338 ft) | 1950 | 118 km |
| Takaharayama | Stratovolcano | 1,795 m (5,889 ft) | -4570 | 131 km |
| Hiuchigatake | Stratovolcano | 2,356 m (7,730 ft) | 1544 | 141 km |
| Omanago Group | Lava dome(s) | 2,341 m (7,680 ft) | -3050 | 149 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 152 km |
| Nikko-Shiranesan | Shield | 2,578 m (8,458 ft) | 1952 | 153 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 184 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-1°C) | 4.4 in | Coldest |
| February | 30°F (-1°C) | 3.5 in | |
| March | 36°F (2°C) | 3.4 in | |
| April | 49°F (9°C) | 3.4 in | Driest |
| May | 59°F (15°C) | 3.4 in | |
| June | 67°F (19°C) | 4.8 in | |
| July | 73°F (23°C) | 6.4 in | Wettest |
| August | 76°F (24°C) | 5.9 in | Warmest |
| September | 67°F (20°C) | 5.9 in | |
| October | 56°F (13°C) | 4.5 in | |
| November | 45°F (7°C) | 4.4 in | |
| December | 35°F (2°C) | 4.6 in |
Nanyō has a seasonal temperature swing of 46°F / from 29°F in January to 76°F in August. Total annual precipitation is 54.5 inches, with July being the wettest month (6.4") and April the driest (3.4").