All Countries
Weather & Climate in Iwakuni, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Iwakuni enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 41°F in January while summers reach 78°F in July. The area gets 211 sunny days per year. Annual precipitation totals 69.0 inches (wetter than the 38-inch national average). The city sits at an elevation of 13 feet.
Temperature
41°F Jan (5°C)
78°F Jul (25°C)
| Annual Average | 59.2°F |
| 10% above US avg | |
| January Average | 41°F (5°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 211 days/yr |
Geography
| Elevation | 13 ft (4 m) |
| Area | 337.4 sq mi (873.7 km²) |
| Population Density | 383/sq mi |
| Coordinates | 34.1630°N, 132.2200°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
146 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 | 30 km | 50 km |
| Apr 17, 2024 | 18 km W of Uwajima, Japan | M6.3 | 102 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 | 62 km | 10 km |
| Apr 8, 2018 | 8 km NNE of ?dach?-?da, Japan | M5.7 | 126 km | 10 km |
| Apr 25, 2001 | 18 km SE of Saiki, Japan | M5.7 | 150 km | 33 km |
| May 22, 1998 | 9 km NE of Bungo-Takada-shi, Japan | M5.5 | 89 km | 81 km |
| Jul 12, 2015 | 12 km SSW of Usuki, Japan | M5.5 | 134 km | 53 km |
| Oct 8, 2000 | 32 km N of Sh?bara, Japan | M5.4 | 132 km | 10 km |
| Sep 3, 1997 | 21 km S of Yasugich?, Japan | M5.3 | 149 km | 10 km |
| Jul 17, 2021 | 29 km NE of Kitsuki, Japan | M5.2 | 71 km | 64 km |
| Mar 25, 2001 | 22 km WNW of H?j?, Japan | M5.2 | 34 km | 43 km |
| Oct 28, 1991 | 13 km SSW of Ube, Japan | M5.2 | 99 km | 17 km |
| Apr 2, 1997 | 34 km WSW of ?zu, Japan | M5.1 | 90 km | 46 km |
| Apr 15, 2016 | 11 km WSW of Beppu, Japan | M5.1 | 128 km | 10 km |
| Apr 15, 2016 | 13 km SW of Saiki, Japan | M5.1 | 150 km | 10 km |
| Apr 26, 2007 | 15 km ESE of Niihama, Japan | M5.1 | 117 km | 50 km |
| Aug 14, 1993 | 19 km SW of ?zu, Japan | M5.0 | 90 km | 41 km |
| Jun 3, 2011 | 9 km ENE of G?tsuch?, Japan | M5.0 | 97 km | 10 km |
| Jun 20, 2017 | 15 km SE of Saiki, Japan | M5.0 | 145 km | 37 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 | 257 km |
| 2022 | Nanmadol | Category 2 | 98 mph | 162 km |
| 2022 | Hinnamnor | Category 1 | 81 mph | 294 km |
| 2020 | Haishen | Category 2 | 98 mph | 287 km |
| 2019 | Francisco | Category 1 | 81 mph | 206 km |
| 2018 | Jebi | Category 3 | 98 mph | 215 km |
| 2018 | Trami | Category 1 | 92 mph | 220 km |
| 2018 | Cimaron | Category 1 | 92 mph | 226 km |
| 2018 | Prapiroon | Category 1 | 69 mph | 281 km |
| 2017 | Noru | Category 1 | 69 mph | 187 km |
| 2016 | Malakas | Category 1 | 86 mph | 193 km |
| 2015 | Goni | Category 3 | 104 mph | 148 km |
| 2015 | Nangka | Category 1 | 86 mph | 232 km |
| 2014 | Phanfone | Category 2 | 92 mph | 292 km |
| 2014 | Halong | Category 1 | 81 mph | 164 km |
| 2011 | Ma-on | Category 1 | 86 mph | 186 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 254 km |
| 2007 | Usagi | Category 2 | 92 mph | 85 km |
| 2007 | Man-yi | Category 1 | 86 mph | 171 km |
| 2006 | Shanshan | Category 1 | 92 mph | 169 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 | 81 km |
| 1596 | BEPPU BAY, KYUSHU | Eruption + Earthquake | 8.0 m | 708 | 107 km |
| 1872 | SW. HONSHU ISLAND | Earthquake | 3.0 m | 804 | 84 km |
| 1715 | SEIKAIDO | Earthquake | — | — | 107 km |
| 1698 | SEIKAIDO-NANKAIDO | Earthquake | — | — | 107 km |
| 1597 | BEPPU BAY, JAPAN | Eruption + Earthquake | — | 40 | 112 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Abu (68 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Abu | Shield(s) | 641 m (2,103 ft) | -6850 | 68 km |
| Sanbesan | Stratovolcano | 1,126 m (3,694 ft) | 650 | 115 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 125 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 150 km |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 176 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 2.2 in | Coldest |
| February | 41°F (5°C) | 3.1 in | |
| March | 46°F (8°C) | 5.0 in | |
| April | 56°F (13°C) | 7.3 in | |
| May | 64°F (18°C) | 7.3 in | |
| June | 70°F (21°C) | 11.5 in | Wettest |
| July | 78°F (25°C) | 9.7 in | |
| August | 80°F (26°C) | 5.7 in | Warmest |
| September | 73°F (23°C) | 7.7 in | |
| October | 64°F (18°C) | 4.5 in | |
| November | 54°F (12°C) | 3.1 in | |
| December | 45°F (7°C) | 1.8 in | Driest |
Iwakuni has a seasonal temperature swing of 39°F / from 41°F in January to 80°F in August. Total annual precipitation is 69.0 inches, with June being the wettest month (11.5") and December the driest (1.8").