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Weather & Climate in Yamaguchi, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Yamaguchi enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 38°F in January while summers reach 76°F in July. The area gets 200 sunny days per year. Annual precipitation totals 74.9 inches (wetter than the 38-inch national average). The city sits at an elevation of 515 feet.
Temperature
38°F Jan (3°C)
76°F Jul (24°C)
| Annual Average | 56.8°F |
| 5% above US avg | |
| January Average | 38°F (3°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 200 days/yr |
Geography
| Elevation | 515 ft (157 m) |
| Area | 395.1 sq mi (1,023.3 km²) |
| Population Density | 491/sq mi |
| Coordinates | 34.1833°N, 131.4667°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
176 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.8.
| Mar 24, 2001 | 16 km SSW of Kure, Japan | M6.8 | 98 km | 50 km |
| Mar 20, 2005 | 28 km NNW of Maebaru-ch??, Japan | M6.6 | 130 km | 10 km |
| Jun 11, 2006 | 15 km S of Tsukawaki, Japan | M6.3 | 120 km | 140 km |
| Apr 17, 2024 | 18 km W of Uwajima, Japan | M6.3 | 133 km | 32 km |
| Mar 13, 2014 | 32 km SSW of Hikari, Japan | M6.3 | 65 km | 79 km |
| Jun 25, 1997 | 17 km E of Hagi, Japan | M5.9 | 27 km | 10 km |
| May 22, 1998 | 9 km NE of Bungo-Takada-shi, Japan | M5.5 | 63 km | 81 km |
| Apr 15, 2016 | 10 km NE of Aso, Japan | M5.5 | 134 km | 13 km |
| Apr 19, 2005 | 8 km NNW of Maebaru-ch??, Japan | M5.5 | 134 km | 19 km |
| Apr 18, 2016 | 8 km NNE of Aso, Japan | M5.5 | 134 km | 10 km |
| Jul 12, 2015 | 12 km SSW of Usuki, Japan | M5.5 | 132 km | 53 km |
| Apr 15, 2016 | 5 km WSW of Aso, Japan | M5.4 | 147 km | 4 km |
| Mar 25, 2001 | 22 km WNW of H?j?, Japan | M5.2 | 101 km | 43 km |
| Jul 17, 2021 | 29 km NE of Kitsuki, Japan | M5.2 | 71 km | 64 km |
| Oct 28, 1991 | 13 km SSW of Ube, Japan | M5.2 | 46 km | 17 km |
| Apr 15, 2016 | 11 km WSW of Beppu, Japan | M5.1 | 104 km | 10 km |
| Apr 2, 1997 | 34 km WSW of ?zu, Japan | M5.1 | 116 km | 46 km |
| Aug 14, 1993 | 19 km SW of ?zu, Japan | M5.0 | 126 km | 41 km |
| Jun 3, 2011 | 9 km ENE of G?tsuch?, Japan | M5.0 | 122 km | 10 km |
| Jan 3, 1991 | 22 km W of ?zu, Japan | M5.0 | 109 km | 63 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
50 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Shanshan | Category 1 | 86 mph | 216 km |
| 2022 | Nanmadol | Category 2 | 98 mph | 103 km |
| 2022 | Hinnamnor | Category 1 | 81 mph | 236 km |
| 2020 | Haishen | Category 2 | 98 mph | 218 km |
| 2020 | Maysak | Category 1 | 92 mph | 276 km |
| 2019 | Francisco | Category 1 | 81 mph | 164 km |
| 2018 | Jebi | Category 3 | 98 mph | 280 km |
| 2018 | Trami | Category 1 | 92 mph | 253 km |
| 2018 | Cimaron | Category 1 | 92 mph | 294 km |
| 2018 | Prapiroon | Category 1 | 69 mph | 213 km |
| 2017 | Noru | Category 1 | 69 mph | 230 km |
| 2016 | Malakas | Category 1 | 86 mph | 237 km |
| 2015 | Goni | Category 3 | 104 mph | 84 km |
| 2015 | Nangka | Category 1 | 86 mph | 294 km |
| 2014 | Halong | Category 1 | 81 mph | 215 km |
| 2013 | Danas | Category 1 | 69 mph | 279 km |
| 2011 | Ma-on | Category 1 | 86 mph | 230 km |
| 2007 | Usagi | Category 2 | 92 mph | 18 km |
| 2007 | Man-yi | Category 1 | 86 mph | 206 km |
| 2006 | Shanshan | Category 1 | 92 mph | 100 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
6 tsunamis recorded within 500 km. Highest wave on record: 10.0 m (33 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1026 | OFF MASUDA, SHIMANE PREFECTURE | Earthquake | 10.0 m | 1,001 | 75 km |
| 1596 | BEPPU BAY, KYUSHU | Eruption + Earthquake | 8.0 m | 708 | 101 km |
| 1872 | SW. HONSHU ISLAND | Earthquake | 3.0 m | 804 | 94 km |
| 1715 | SEIKAIDO | Earthquake | — | — | 101 km |
| 1698 | SEIKAIDO-NANKAIDO | Earthquake | — | — | 101 km |
| 1597 | BEPPU BAY, JAPAN | Eruption + Earthquake | — | 40 | 99 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
6 volcanoes within 200 km. Closest: Abu (37 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Abu | Shield(s) | 641 m (2,103 ft) | -6850 | 37 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 101 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 124 km |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 148 km |
| Sanbesan | Stratovolcano | 1,126 m (3,694 ft) | 650 | 150 km |
| Unzendake | Complex | 1,483 m (4,865 ft) | 1996 | 192 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 38°F (3°C) | 3.1 in | Coldest |
| February | 39°F (4°C) | 3.6 in | |
| March | 44°F (7°C) | 5.3 in | |
| April | 54°F (12°C) | 7.4 in | |
| May | 62°F (16°C) | 7.2 in | |
| June | 68°F (20°C) | 11.9 in | |
| July | 76°F (24°C) | 12.5 in | Wettest |
| August | 78°F (25°C) | 6.3 in | Warmest |
| September | 71°F (21°C) | 7.8 in | |
| October | 61°F (16°C) | 4.1 in | |
| November | 51°F (11°C) | 3.2 in | |
| December | 42°F (6°C) | 2.5 in | Driest |
Yamaguchi has a seasonal temperature swing of 40°F / from 38°F in January to 78°F in August. Total annual precipitation is 74.9 inches, with July being the wettest month (12.5") and December the driest (2.5").