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Weather & Climate in Iyo, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Iyo enjoys a temperate climate with an average annual temperature of 60°F (15°C). Winters average 40°F in January while summers reach 79°F in July. The area gets 212 sunny days per year. Annual precipitation totals 68.4 inches (wetter than the 38-inch national average). The city sits at an elevation of 46 feet.
Temperature
40°F Jan (4°C)
79°F Jul (26°C)
| Annual Average | 59.5°F |
| 10% above US avg | |
| January Average | 40°F (4°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 212 days/yr |
Geography
| Elevation | 46 ft (14 m) |
| Area | 75.1 sq mi (194.4 km²) |
| Population Density | 468/sq mi |
| Coordinates | 33.7514°N, 132.7014°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
180 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 | 40 km | 50 km |
| Jan 21, 2022 | 27 km SSE of Saiki, Japan | M6.3 | 129 km | 39 km |
| Apr 17, 2024 | 18 km W of Uwajima, Japan | M6.3 | 64 km | 32 km |
| Mar 13, 2014 | 32 km SSW of Hikari, Japan | M6.3 | 81 km | 79 km |
| Jun 25, 1997 | 17 km E of Hagi, Japan | M5.9 | 124 km | 10 km |
| Apr 25, 2001 | 18 km SE of Saiki, Japan | M5.7 | 121 km | 33 km |
| Mar 27, 2006 | 45 km SSE of Saiki, Japan | M5.5 | 138 km | 35 km |
| May 22, 1998 | 9 km NE of Bungo-Takada-shi, Japan | M5.5 | 111 km | 81 km |
| Jul 12, 2015 | 12 km SSW of Usuki, Japan | M5.5 | 120 km | 53 km |
| Mar 2, 2017 | 39 km SSE of Saiki, Japan | M5.3 | 136 km | 44 km |
| Oct 28, 1991 | 13 km SSW of Ube, Japan | M5.2 | 137 km | 17 km |
| Jul 17, 2021 | 29 km NE of Kitsuki, Japan | M5.2 | 83 km | 64 km |
| Mar 25, 2001 | 22 km WNW of H?j?, Japan | M5.2 | 33 km | 43 km |
| Apr 15, 2016 | 11 km WSW of Beppu, Japan | M5.1 | 135 km | 10 km |
| Apr 15, 2016 | 13 km SW of Saiki, Japan | M5.1 | 130 km | 10 km |
| Apr 2, 1997 | 34 km WSW of ?zu, Japan | M5.1 | 62 km | 46 km |
| Apr 26, 2007 | 15 km ESE of Niihama, Japan | M5.1 | 71 km | 50 km |
| Feb 18, 2018 | 27 km SE of Saiki, Japan | M5.0 | 118 km | 42 km |
| Jun 20, 2017 | 15 km SE of Saiki, Japan | M5.0 | 116 km | 37 km |
| Jun 3, 2011 | 9 km ENE of G?tsuch?, Japan | M5.0 | 146 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
54 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Shanshan | Category 2 | 98 mph | 263 km |
| 2023 | Lan | Category 1 | 69 mph | 277 km |
| 2022 | Nanmadol | Category 2 | 98 mph | 195 km |
| 2019 | Francisco | Category 1 | 81 mph | 215 km |
| 2018 | Jebi | Category 3 | 98 mph | 157 km |
| 2018 | Trami | Category 1 | 98 mph | 164 km |
| 2018 | Cimaron | Category 1 | 92 mph | 176 km |
| 2017 | Noru | Category 1 | 69 mph | 124 km |
| 2016 | Malakas | Category 2 | 86 mph | 129 km |
| 2015 | Goni | Category 3 | 104 mph | 204 km |
| 2015 | Nangka | Category 1 | 86 mph | 170 km |
| 2014 | Phanfone | Category 2 | 92 mph | 228 km |
| 2014 | Halong | Category 1 | 81 mph | 100 km |
| 2012 | Jelawat | Category 1 | 92 mph | 241 km |
| 2011 | Roke | Category 4 | 98 mph | 285 km |
| 2011 | Ma-on | Category 1 | 86 mph | 125 km |
| 2009 | Melor | Category 1 | 92 mph | 293 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 191 km |
| 2007 | Usagi | Category 3 | 98 mph | 130 km |
| 2007 | Man-yi | Category 2 | 86 mph | 117 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
8 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 | 143 km |
| 1596 | BEPPU BAY, KYUSHU | Eruption + Earthquake | 8.0 m | 708 | 106 km |
| 1872 | SW. HONSHU ISLAND | Earthquake | 3.0 m | 804 | 143 km |
| 1711 | SEIONAIKAI, JAPAN | Earthquake | 2.0 m | 1,000 | 134 km |
| 1899 | SEIKAIDO | Earthquake | - | - | 123 km |
| 1715 | SEIKAIDO | Earthquake | - | - | 106 km |
| 1698 | SEIKAIDO-NANKAIDO | Earthquake | - | - | 106 km |
| 1597 | BEPPU BAY, JAPAN | Eruption + Earthquake | - | 40 | 114 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Abu (131 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Abu | Shield(s) | 641 m (2,103 ft) | -6850 | 131 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 132 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 154 km |
| Sanbesan | Stratovolcano | 1,126 m (3,694 ft) | 650 | 155 km |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 177 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (4°C) | 2.2 in | Coldest |
| February | 41°F (5°C) | 3.0 in | |
| March | 47°F (8°C) | 4.5 in | |
| April | 57°F (14°C) | 6.7 in | |
| May | 65°F (18°C) | 6.9 in | |
| June | 71°F (22°C) | 10.7 in | Wettest |
| July | 79°F (26°C) | 9.1 in | |
| August | 80°F (27°C) | 6.2 in | Warmest |
| September | 74°F (23°C) | 8.3 in | |
| October | 63°F (17°C) | 5.2 in | |
| November | 53°F (12°C) | 3.2 in | |
| December | 44°F (7°C) | 2.2 in | Driest |
Iyo has a seasonal temperature swing of 40°F / from 40°F in January to 80°F in August. Total annual precipitation is 68.4 inches, with June being the wettest month (10.7") and December the driest (2.2").