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Weather & Climate in Iheya, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Iheya has a warm climate with an average annual temperature of 72°F (22°C). Winters average 61°F in January while summers reach 83°F in July. The area gets 188 sunny days per year. Annual precipitation totals 81.6 inches (wetter than the 38-inch national average).
Temperature
61°F Jan (16°C)
83°F Jul (28°C)
| Annual Average | 72.1°F |
| 34% above US avg | |
| January Average | 61°F (16°C) |
| July Average | 83°F (28°C) |
| Sunny Days | 188 days/yr |
Geography
| Area | 75.2 sq mi (194.8 km²) |
| Population Density | 16/sq mi |
| Coordinates | 27.0190°N, 127.9744°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
931 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.0.
| Feb 26, 2010 | 70 km SE of Katsuren-haebaru, Japan | M7.0 | 129 km | 25 km |
| Mar 2, 2014 | 109 km NW of Nago, Japan | M6.5 | 76 km | 119 km |
| Jul 22, 2004 | 91 km E of Nago, Japan | M6.1 | 109 km | 21 km |
| Aug 7, 2007 | 136 km WNW of Nago, Japan | M6.0 | 117 km | 18 km |
| Jun 16, 1990 | 153 km N of Nago, Japan | M6.0 | 109 km | 27 km |
| Jul 8, 2008 | 107 km NNE of Nago, Japan | M6.0 | 67 km | 43 km |
| Apr 14, 1991 | 82 km NW of Nago, Japan | M6.0 | 57 km | 83 km |
| Jun 4, 1992 | 145 km WSW of Naze, Japan | M6.0 | 111 km | 17 km |
| Mar 26, 2009 | 155 km NW of Nago, Japan | M5.9 | 133 km | 160 km |
| May 1, 2023 | 69 km ESE of Katsuren-haebaru, Japan | M5.9 | 122 km | 9 km |
| Jul 31, 2007 | 134 km NW of Nago, Japan | M5.9 | 113 km | 10 km |
| Sep 28, 2009 | 146 km N of Nago, Japan | M5.8 | 102 km | 9 km |
| May 17, 1990 | 13 km W of Nago, Japan | M5.8 | 46 km | 33 km |
| Jun 2, 1996 | 102 km NNE of Nago, Japan | M5.8 | 68 km | 42 km |
| Apr 20, 2007 | 102 km NNE of Nago, Japan | M5.7 | 64 km | 42 km |
| Sep 26, 2016 | 110 km NNE of Nago, Japan | M5.7 | 78 km | 38 km |
| Aug 3, 2014 | 143 km WSW of Naze, Japan | M5.7 | 115 km | 10 km |
| Jun 13, 2013 | 90 km E of Nago, Japan | M5.6 | 105 km | 20 km |
| Jan 15, 1995 | 109 km NNE of Nago, Japan | M5.6 | 73 km | 47 km |
| Feb 8, 2022 | Ryukyu Islands, Japan | M5.6 | 145 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
101 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 5.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Shanshan | Category 4 | 109 mph | 289 km |
| 2024 | Bebinca | Category 1 | 86 mph | 210 km |
| 2023 | Khanun | Category 4 | 109 mph | 171 km |
| 2022 | Hinnamnor | Category 4 | 115 mph | 207 km |
| 2021 | In-fa | Category 1 | 86 mph | 298 km |
| 2020 | Maysak | Category 4 | 109 mph | 179 km |
| 2020 | Haishen | Category 4 | 115 mph | 261 km |
| 2020 | Bavi | Category 2 | 92 mph | 168 km |
| 2019 | Lingling | Category 4 | 109 mph | 276 km |
| 2019 | Tapah | Category 1 | 75 mph | 239 km |
| 2019 | Neoguri | Category 1 | 81 mph | 263 km |
| 2018 | Soulik | Category 2 | 98 mph | 284 km |
| 2018 | Trami | Category 2 | 98 mph | 20 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 99 km |
| 2018 | Kong-rey | Category 1 | 69 mph | 189 km |
| 2017 | Saola | Category 1 | 69 mph | 43 km |
| 2016 | Chaba | Category 5 | 132 mph | 158 km |
| 2016 | Namtheun | Category 3 | 81 mph | 280 km |
| 2016 | Malakas | Category 3 | 109 mph | 255 km |
| 2015 | Chan-hom | Category 4 | 104 mph | 254 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
3 tsunamis recorded within 500 km. Highest wave on record: 1.2 m (4 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1768 | RYUKYU ISLANDS | Earthquake | 1.2 m | — | 103 km |
| 2010 | RYUKYU ISLANDS | Earthquake | 0.1 m | — | 129 km |
| 1664 | TORISHIMA, RYUKYU ISLANDS | Astronomical | — | — | 96 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: Io-Torishima (99 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Io-Torishima | Complex | 212 m (696 ft) | 1968 | 99 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 61°F (16°C) | 4.8 in | |
| February | 61°F (16°C) | 5.0 in | Coldest |
| March | 64°F (18°C) | 6.3 in | |
| April | 69°F (21°C) | 7.8 in | |
| May | 74°F (23°C) | 9.4 in | |
| June | 79°F (26°C) | 9.7 in | Wettest |
| July | 83°F (28°C) | 6.9 in | Warmest |
| August | 83°F (28°C) | 8.6 in | |
| September | 81°F (27°C) | 7.0 in | |
| October | 76°F (25°C) | 6.4 in | |
| November | 71°F (21°C) | 5.5 in | |
| December | 65°F (18°C) | 4.2 in | Driest |
Iheya has a seasonal temperature swing of 22°F / from 61°F in February to 83°F in July. Total annual precipitation is 81.6 inches, with June being the wettest month (9.7") and December the driest (4.2").