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Weather & Climate in Isa, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Isa enjoys a temperate climate with an average annual temperature of 58°F (15°C). Winters average 39°F in January while summers reach 76°F in July. The area gets 176 sunny days per year. Annual precipitation totals 98.9 inches (wetter than the 38-inch national average). The city sits at an elevation of 600 feet.
Temperature
39°F Jan (4°C)
76°F Jul (25°C)
| Annual Average | 58.2°F |
| 8% above US avg | |
| January Average | 39°F (4°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 176 days/yr |
Geography
| Elevation | 600 ft (183 m) |
| Area | 163.6 sq mi (423.8 km²) |
| Population Density | 149/sq mi |
| Coordinates | 32.0672°N, 130.6118°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
634 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.1.
| Aug 8, 2024 | 2024 Hyuganada Sea, Japan Earthquake | M7.1 | 91 km | 24 km |
| Apr 15, 2016 | 6 km ESE of Kumamoto, Japan | M7.0 | 82 km | 10 km |
| Jan 13, 2025 | 15 km SE of Miyazaki, Japan | M6.8 | 93 km | 39 km |
| Oct 19, 1996 | 5 km SE of Miyazaki, Japan | M6.7 | 83 km | 22 km |
| Dec 2, 1996 | 17 km SW of Miyazaki, Japan | M6.7 | 73 km | 49 km |
| Jun 11, 2006 | 15 km S of Tsukawaki, Japan | M6.3 | 129 km | 140 km |
| May 9, 2019 | 43 km ESE of Miyazaki, Japan | M6.2 | 121 km | 22 km |
| Sep 3, 2009 | 32 km WSW of Makurazaki, Japan | M6.2 | 118 km | 163 km |
| Apr 14, 2016 | 2 km SSE of Kumamoto, Japan | M6.2 | 81 km | 9 km |
| May 13, 1997 | 1 km WNW of Satsumasendai, Japan | M6.1 | 41 km | 33 km |
| Apr 2, 2025 | 56 km ENE of Nishinoomote, Japan | M6.1 | 149 km | 29 km |
| Mar 26, 1997 | 16 km NE of Satsumasendai, Japan | M6.1 | 24 km | 10 km |
| Dec 16, 1998 | 22 km S of Kushima, Japan | M6.0 | 108 km | 42 km |
| Apr 14, 2016 | 5 km ENE of Uto, Japan | M6.0 | 71 km | 8 km |
| Jun 25, 2000 | 33 km S of Kushima, Japan | M6.0 | 113 km | 10 km |
| Apr 30, 1994 | 8 km SSE of Kushima, Japan | M5.9 | 97 km | 26 km |
| Sep 23, 1992 | 17 km SSW of Makurazaki, Japan | M5.8 | 110 km | 161 km |
| Apr 5, 2009 | 10 km N of Miyazaki, Japan | M5.8 | 76 km | 26 km |
| Aug 28, 2014 | 53 km E of Takanabe, Japan | M5.8 | 137 km | 20 km |
| Apr 15, 2016 | 6 km S of Kikuchi, Japan | M5.7 | 97 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
71 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Shanshan | Category 3 | 109 mph | 39 km |
| 2022 | Nanmadol | Category 3 | 104 mph | 21 km |
| 2020 | Haishen | Category 3 | 104 mph | 134 km |
| 2020 | Maysak | Category 2 | 92 mph | 284 km |
| 2019 | Francisco | Category 1 | 81 mph | 67 km |
| 2018 | Jebi | Category 3 | 98 mph | 263 km |
| 2018 | Trami | Category 2 | 98 mph | 143 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 207 km |
| 2017 | Noru | Category 1 | 75 mph | 137 km |
| 2016 | Malakas | Category 3 | 109 mph | 97 km |
| 2016 | Namtheun | Category 2 | 81 mph | 156 km |
| 2015 | Goni | Category 3 | 104 mph | 47 km |
| 2014 | Phanfone | Category 2 | 98 mph | 235 km |
| 2014 | Halong | Category 1 | 86 mph | 198 km |
| 2013 | Danas | Category 1 | 75 mph | 268 km |
| 2012 | Sanba | Category 3 | 104 mph | 257 km |
| 2012 | Guchol | Category 1 | 81 mph | 280 km |
| 2012 | Damrey | Category 1 | 63 mph | 215 km |
| 2011 | Ma-on | Category 1 | 86 mph | 209 km |
| 2007 | Usagi | Category 3 | 104 mph | 105 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
20 tsunamis recorded within 500 km. Highest wave on record: 55.0 m (180 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1792 | SHIMABARA BAY, KYUSHU ISLAND | Landslide | 55.0 m | 15,000 | 81 km |
| 1780 | SW. KYUSHU ISLAND | Astronomical | 6.0 m | - | 53 km |
| 1662 | HIUGANADA | Earthquake | 5.0 m | 200 | 137 km |
| 1914 | SEIKAIDO | Eruption | 3.0 m | 63 | 54 km |
| 1769 | SW. KYUSHU ISLAND | Earthquake | 2.5 m | - | 133 km |
| 1941 | SEIKAIDO | Earthquake | 1.2 m | 2 | 141 km |
| 1939 | SEIKAIDO | Earthquake | 0.8 m | 1 | 133 km |
| 1931 | SEIKAIDO | Earthquake | 0.8 m | 1 | 141 km |
| 1961 | SEIKAIDO | Earthquake | 0.7 m | 2 | 124 km |
| 1996 | KYUSHU ISLAND | Earthquake | 0.6 m | - | 83 km |
| 2024 | HYUGANADA SEA | Earthquake | 0.5 m | - | 95 km |
| 1970 | SEIKAIDO | Earthquake | 0.3 m | - | 104 km |
| 1899 | SEIKAIDO | Earthquake | 0.3 m | - | 132 km |
| 2025 | HYUGANADA SEA | Earthquake | 0.2 m | - | 95 km |
| 1996 | SEA OF JAPAN | Earthquake | 0.2 m | - | 73 km |
| 1984 | KYUSHU, JAPAN | Earthquake | 0.2 m | - | 130 km |
| 1969 | RYUKYU ISLANDS | Earthquake | 0.1 m | - | 141 km |
| 1987 | KYUSHU ISLAND | Earthquake | 0.0 m | 2 | 116 km |
| 1828 | AMAKUSA SEA | Earthquake | - | - | 89 km |
| 1781 | SW. KYUSHU ISLAND | Astronomical | - | 38 | 54 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
11 volcanoes within 200 km. Closest: Kirishimayama (28 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Kirishimayama | Shield | 1,700 m (5,577 ft) | 2018 | 28 km |
| Yonemaru-Sumiyoshiike | Maar(s) | 40 m (131 ft) | -6200 | 33 km |
| Aira | Caldera | 1,117 m (3,665 ft) | 2020 | 53 km |
| Unzendake | Complex | 1,483 m (4,865 ft) | 1996 | 83 km |
| Ata | Caldera(s) | 924 m (3,031 ft) | 885 | 94 km |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 102 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 128 km |
| Kikai | Caldera | 704 m (2,310 ft) | 2020 | 145 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 154 km |
| Fukue | Shield(s) | 315 m (1,033 ft) | -400 | 178 km |
| Kuchinoerabujima | Stratovolcano(es) | 657 m (2,156 ft) | 2020 | 185 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 3.4 in | Coldest |
| February | 41°F (5°C) | 4.4 in | |
| March | 47°F (8°C) | 6.6 in | |
| April | 56°F (13°C) | 8.8 in | |
| May | 63°F (17°C) | 10.2 in | |
| June | 70°F (21°C) | 18.2 in | Wettest |
| July | 76°F (25°C) | 17.8 in | |
| August | 77°F (25°C) | 10.1 in | Warmest |
| September | 72°F (22°C) | 8.6 in | |
| October | 63°F (17°C) | 4.6 in | |
| November | 53°F (11°C) | 3.5 in | |
| December | 43°F (6°C) | 2.8 in | Driest |
Isa has a seasonal temperature swing of 39°F / from 39°F in January to 77°F in August. Total annual precipitation is 98.9 inches, with June being the wettest month (18.2") and December the driest (2.8").