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Weather & Climate in Itoigawa, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Itoigawa experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 33°F in January while summers reach 74°F in July. The area gets 196 sunny days per year. Annual precipitation totals 77.4 inches (wetter than the 38-inch national average). The area receives 15.4 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 49 feet.
Temperature
33°F Jan (1°C)
74°F Jul (23°C)
| Annual Average | 53.8°F |
| 0% below US avg | |
| January Average | 33°F (1°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 196 days/yr |
Geography
| Elevation | 49 ft (15 m) |
| Area | 288.1 sq mi (746.2 km²) |
| Population Density | 141/sq mi |
| Coordinates | 37.0333°N, 137.8500°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
632 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.5.
| Jan 1, 2024 | 2024 Noto Peninsula, Japan Earthquake | M7.5 | 72 km | 10 km |
| Mar 25, 2007 | 46 km NW of Nanao, Japan | M6.7 | 117 km | 8 km |
| Jul 16, 2007 | 20 km NNW of Kashiwazaki, Japan | M6.6 | 77 km | 12 km |
| Feb 7, 1993 | 69 km NNE of Nanao, Japan | M6.6 | 86 km | 11 km |
| Mar 11, 2011 | 13 km E of Arai, Japan | M6.2 | 47 km | 9 km |
| May 5, 2023 | 49 km NE of Anamizu, Japan | M6.2 | 75 km | 10 km |
| Jan 1, 2024 | 8 km SW of Anamizu, Japan | M6.2 | 92 km | 10 km |
| Jan 9, 2024 | 53 km WSW of Sado, Japan | M5.9 | 92 km | 10 km |
| Jan 1, 2024 | 42 km NE of Anamizu, Japan | M5.8 | 74 km | 10 km |
| Feb 25, 2013 | 29 km NE of Numata, Japan | M5.8 | 126 km | 10 km |
| Mar 11, 2011 | eastern Honshu, Japan | M5.7 | 41 km | 12 km |
| Jun 2, 2024 | 40 km NE of Anamizu, Japan | M5.7 | 69 km | 9 km |
| Jul 16, 2007 | 16 km NNW of Kashiwazaki, Japan | M5.7 | 76 km | 15 km |
| Jan 1, 2024 | 7 km N of Anamizu, Japan | M5.6 | 90 km | 10 km |
| May 5, 2023 | 43 km NE of Anamizu, Japan | M5.6 | 72 km | 10 km |
| Jan 1, 2024 | 54 km NE of Anamizu, Japan | M5.6 | 67 km | 10 km |
| Apr 11, 2011 | 8 km WSW of Iiyama, Japan | M5.5 | 46 km | 17 km |
| Aug 15, 1998 | 22 km WSW of Hotaka, Japan | M5.5 | 87 km | 10 km |
| Jan 1, 2024 | 56 km NE of Anamizu, Japan | M5.5 | 68 km | 10 km |
| May 17, 1990 | 7 km W of Nanao, Japan | M5.4 | 86 km | 267 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
28 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2019 | Faxai | Category 2 | 92 mph | 251 km |
| 2019 | Hagibis | Category 1 | 92 mph | 211 km |
| 2018 | Jebi | Category 1 | 86 mph | 115 km |
| 2018 | Jongdari | Category 1 | 75 mph | 290 km |
| 2014 | Phanfone | Category 1 | 75 mph | 242 km |
| 2011 | Roke | Category 1 | 92 mph | 175 km |
| 2007 | Fitow | Category 1 | 75 mph | 200 km |
| 2005 | Mawar | Category 2 | 81 mph | 259 km |
| 2004 | Ma-on | Category 3 | 92 mph | 237 km |
| 2004 | Songda | Category 1 | 75 mph | 252 km |
| 2004 | Chaba | Category 1 | 69 mph | 167 km |
| 2003 | Etau | Category 1 | 58 mph | 217 km |
| 2002 | Higos | Category 1 | 81 mph | 222 km |
| 2001 | Danas | Category 1 | 63 mph | 229 km |
| 1999 | Bart | Category 1 | 75 mph | 277 km |
| 1998 | Vicki | Category 2 | 69 mph | 48 km |
| 1998 | Zeb | Category 1 | 58 mph | 201 km |
| 1998 | Stella | Category 1 | 69 mph | 189 km |
| 1996 | Kirk | Category 1 | 63 mph | 129 km |
| 1995 | Ryan | Category 1 | 40 mph | 224 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
15 tsunamis recorded within 500 km. Highest wave on record: 11.3 m (37 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2024 | HONSHU: W COAST | Eruption + Earthquake | 11.3 m | 549 | 72 km |
| 1993 | HONSHU ISLAND | Earthquake | 0.5 m | - | 86 km |
| 1987 | HONSHU ISLAND | Earthquake | 0.2 m | - | 46 km |
| 2023 | NOTO PENINSULA, JAPAN | Earthquake | 0.1 m | 1 | 74 km |
| 2007 | HONSHU: W COAST | Earthquake | 0.1 m | 1 | 117 km |
| 2007 | HONSHU: W COAST | Earthquake | - | 15 | 82 km |
| 1892 | SW. HONSHU ISLAND | Earthquake | - | 1 | 93 km |
| 1802 | NW. HONSHU ISLAND | Earthquake | - | 19 | 84 km |
| 1799 | SW. HONSHU ISLAND | Earthquake | - | - | 121 km |
| 1762 | NW. HONSHU ISLAND | Earthquake | - | - | 140 km |
| 1751 | NW. HONSHU ISLAND | Eruption + Earthquake | - | 2,100 | 29 km |
| 1614 | NIIGATA PREFECTURE | Earthquake | - | - | 54 km |
| 1448 | SADO, JAPAN | Earthquake | - | - | 60 km |
| 887 | NIIGATA | Earthquake | - | 2,000 | 56 km |
| 863 | NW. HONSHU ISLAND | Eruption + Earthquake | - | - | 15 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Niigata-Yakeyama (21 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Niigata-Yakeyama | Lava dome | 2,400 m (7,874 ft) | 1998 | 21 km |
| Myokosan | Stratovolcano | 2,454 m (8,051 ft) | -750 | 28 km |
| Midagahara | Stratovolcano | 2,621 m (8,599 ft) | 1839 | 56 km |
| Shiga | Shield(s) | 2,041 m (6,696 ft) | Unknown | 71 km |
| Washiba-Kumonotaira | Shield(s) | 2,924 m (9,593 ft) | Unknown | 73 km |
| Kusatsu-Shiranesan | Stratovolcano(es) | 2,165 m (7,103 ft) | 2018 | 76 km |
| Asamayama | Complex | 2,568 m (8,425 ft) | 2019 | 92 km |
| Yakedake | Stratovolcano(es) | 2,455 m (8,054 ft) | 1995 | 93 km |
| Norikuradake | Stratovolcano(es) | 3,026 m (9,928 ft) | -50 | 106 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 109 km |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 113 km |
| Hiuchigatake | Stratovolcano | 2,356 m (7,730 ft) | 1544 | 128 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 131 km |
| Ontakesan | Complex | 3,067 m (10,062 ft) | 2014 | 131 km |
| Hakusan | Stratovolcano | 2,702 m (8,865 ft) | 1659 | 137 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 33°F (1°C) | 9.2 in | Wettest |
| February | 33°F (1°C) | 6.1 in | Coldest |
| March | 38°F (4°C) | 5.0 in | |
| April | 50°F (10°C) | 3.7 in | Driest |
| May | 59°F (15°C) | 3.9 in | |
| June | 67°F (19°C) | 5.9 in | |
| July | 74°F (23°C) | 7.3 in | |
| August | 77°F (25°C) | 5.5 in | Warmest |
| September | 69°F (21°C) | 7.9 in | |
| October | 58°F (14°C) | 6.2 in | |
| November | 48°F (9°C) | 7.5 in | |
| December | 38°F (4°C) | 9.1 in |
Itoigawa has a seasonal temperature swing of 44°F / from 33°F in February to 77°F in August. Total annual precipitation is 77.4 inches, with January being the wettest month (9.2") and April the driest (3.7").