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Weather & Climate in Muroran, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Muroran experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 29°F in January while summers reach 65°F in July. The area gets 250 sunny days per year, above the national average. Annual precipitation totals 47.3 inches (wetter than the 38-inch national average). The area receives 9.8 inches of snow annually. The city sits at an elevation of 26 feet.
Temperature
29°F Jan (-2°C)
65°F Jul (18°C)
| Annual Average | 47.5°F |
| 12% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 65°F (18°C) |
| Sunny Days | 250 days/yr |
Geography
| Elevation | 26 ft (8 m) |
| Area | 31.3 sq mi (81.0 km²) |
| Population Density | 3,075/sq mi |
| Coordinates | 42.3172°N, 140.9881°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
961 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.5.
| Aug 7, 1993 | 69 km WNW of Kamiiso, Japan | M6.5 | 102 km | 14 km |
| Nov 26, 1991 | 33 km SSE of Shizunai-furukawach?, Japan | M6.4 | 130 km | 56 km |
| Jul 12, 1992 | 70 km ENE of Mutsu, Japan | M6.2 | 129 km | 64 km |
| Jun 11, 2023 | 20 km WSW of Biratori, Japan | M6.2 | 78 km | 121 km |
| Aug 24, 1992 | 9 km NNW of Honch?, Japan | M6.2 | 47 km | 121 km |
| Jun 8, 2015 | 74 km ENE of Mutsu, Japan | M6.1 | 120 km | 42 km |
| May 23, 2012 | 72 km E of Mutsu, Japan | M5.9 | 142 km | 46 km |
| May 5, 2023 | 68 km ENE of Mutsu, Japan | M5.9 | 122 km | 59 km |
| Apr 29, 2008 | 70 km ENE of Mutsu, Japan | M5.8 | 129 km | 47 km |
| Sep 13, 2010 | 68 km ENE of Mutsu, Japan | M5.8 | 123 km | 45 km |
| Jan 30, 1998 | 70 km ENE of Mutsu, Japan | M5.8 | 128 km | 33 km |
| Mar 7, 2017 | 62 km ENE of Mutsu, Japan | M5.7 | 117 km | 56 km |
| Apr 3, 2002 | 60 km ENE of Mutsu, Japan | M5.7 | 112 km | 71 km |
| Jan 11, 1995 | 45 km SSE of Shizunai-furukawach?, Japan | M5.6 | 131 km | 57 km |
| Apr 18, 2007 | 21 km E of Tomakomai, Japan | M5.5 | 81 km | 120 km |
| May 18, 2007 | 73 km ENE of Mutsu, Japan | M5.5 | 115 km | 58 km |
| Feb 28, 2009 | 37 km NW of Shizunai-furukawach?, Japan | M5.5 | 97 km | 105 km |
| Jul 8, 2014 | 13 km N of Shiraoi, Japan | M5.5 | 49 km | 10 km |
| Feb 14, 2002 | 70 km ENE of Mutsu, Japan | M5.5 | 128 km | 61 km |
| Jun 25, 2008 | 45 km SSE of Shizunai-furukawach?, Japan | M5.5 | 131 km | 56 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
2 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 2002 | Higos | Category 1 | 69 mph | 205 km |
| 1998 | Vicki | Category 1 | 58 mph | 250 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
5 tsunamis recorded within 500 km. Highest wave on record: 8.0 m (26 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1640 | SE. HOKKAIDO ISLAND | Explosion | 8.0 m | 700 | 37 km |
| 1982 | HOKKAIDO ISLAND | Earthquake | 1.3 m | 110 | 114 km |
| 1993 | JAPAN | Earthquake | 0.2 m | - | 102 km |
| 1834 | W. HOKKAIDO ISLAND | Earthquake | - | - | 114 km |
| 1792 | W. HOKKAIDO ISLAND | Earthquake | - | - | 135 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
12 volcanoes within 200 km. Closest: Kuttara (24 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Kuttara | Stratovolcano(es) | 549 m (1,801 ft) | 1820 | 24 km |
| Toya | Stratovolcano | 733 m (2,405 ft) | 2001 | 28 km |
| Hokkaido-Komagatake | Stratovolcano | 1,131 m (3,711 ft) | 2000 | 38 km |
| Shikotsu | Caldera | 1,320 m (4,331 ft) | 1979 | 52 km |
| Yoteizan | Stratovolcano | 1,888 m (6,194 ft) | -1050 | 59 km |
| Esan | Lava dome(s) | 618 m (2,028 ft) | 1874 | 59 km |
| Niseko | Stratovolcano(es) | 1,308 m (4,291 ft) | -4900 | 68 km |
| Osorezan | Stratovolcano | 878 m (2,881 ft) | 1787 | 116 km |
| Oshima-Oshima | Stratovolcano | 732 m (2,402 ft) | 1790 | 161 km |
| Hakkodasan | Stratovolcano(es) | 1,585 m (5,200 ft) | 1550 | 185 km |
| Tokachidake | Stratovolcano(es) | 2,077 m (6,814 ft) | 2004 | 185 km |
| Iwakisan | Stratovolcano | 1,625 m (5,331 ft) | 1863 | 193 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 2.6 in | Coldest |
| February | 29°F (-2°C) | 2.1 in | Driest |
| March | 33°F (1°C) | 2.3 in | |
| April | 42°F (6°C) | 3.1 in | |
| May | 51°F (10°C) | 3.7 in | |
| June | 57°F (14°C) | 4.0 in | |
| July | 65°F (18°C) | 5.7 in | |
| August | 69°F (21°C) | 7.2 in | Warmest, Wettest |
| September | 64°F (18°C) | 6.4 in | |
| October | 54°F (12°C) | 4.0 in | |
| November | 43°F (6°C) | 3.5 in | |
| December | 34°F (1°C) | 2.8 in |
Muroran has a seasonal temperature swing of 41°F / from 29°F in January to 69°F in August. Total annual precipitation is 47.3 inches, with August being the wettest month (7.2") and February the driest (2.1").