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Weather & Climate in Isahaya, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Isahaya enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 40°F in January while summers reach 77°F in July. The area gets 191 sunny days per year. Annual precipitation totals 84.9 inches (wetter than the 38-inch national average). The city sits at an elevation of 341 feet.
Temperature
40°F Jan (4°C)
77°F Jul (25°C)
| Annual Average | 59.0°F |
| 9% above US avg | |
| January Average | 40°F (4°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 191 days/yr |
Geography
| Elevation | 341 ft (104 m) |
| Area | 124.0 sq mi (321.2 km²) |
| Population Density | 1,093/sq mi |
| Coordinates | 32.8411°N, 130.0431°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
249 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.0.
| Apr 15, 2016 | 6 km ESE of Kumamoto, Japan | M7.0 | 67 km | 10 km |
| Mar 20, 2005 | 28 km NNW of Maebaru-ch??, Japan | M6.6 | 108 km | 10 km |
| Jun 11, 2006 | 15 km S of Tsukawaki, Japan | M6.3 | 108 km | 140 km |
| Apr 14, 2016 | 2 km SSE of Kumamoto, Japan | M6.2 | 62 km | 9 km |
| May 13, 1997 | 1 km WNW of Satsumasendai, Japan | M6.1 | 115 km | 33 km |
| Mar 26, 1997 | 16 km NE of Satsumasendai, Japan | M6.1 | 109 km | 10 km |
| Apr 14, 2016 | 5 km ENE of Uto, Japan | M6.0 | 65 km | 8 km |
| Apr 15, 2016 | 6 km S of Kikuchi, Japan | M5.7 | 72 km | 10 km |
| Apr 19, 2005 | 8 km NNW of Maebaru-ch??, Japan | M5.5 | 89 km | 19 km |
| Apr 2, 1997 | 19 km W of Satsumasendai, Japan | M5.5 | 113 km | 10 km |
| Apr 18, 2016 | 8 km NNE of Aso, Japan | M5.5 | 100 km | 10 km |
| Apr 15, 2016 | 10 km NE of Aso, Japan | M5.5 | 106 km | 13 km |
| Apr 15, 2016 | 5 km WSW of Aso, Japan | M5.4 | 92 km | 4 km |
| Nov 4, 2002 | Kyushu, Japan | M5.4 | 150 km | 33 km |
| Apr 14, 2016 | 14 km ESE of Kumamoto, Japan | M5.4 | 74 km | 10 km |
| Feb 12, 1994 | 4 km WSW of ?kuchi-shinohara, Japan | M5.4 | 101 km | 31 km |
| Apr 14, 2016 | 4 km NNE of Uto, Japan | M5.3 | 62 km | 10 km |
| Apr 15, 2016 | 13 km ESE of Kumamoto, Japan | M5.3 | 73 km | 10 km |
| Apr 15, 2016 | 5 km ENE of Uto, Japan | M5.3 | 65 km | 10 km |
| Apr 19, 2016 | 6 km NNE of Honmachi, Japan | M5.3 | 62 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
66 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 | 45 km |
| 2022 | Nanmadol | Category 3 | 104 mph | 43 km |
| 2022 | Hinnamnor | Category 2 | 86 mph | 235 km |
| 2020 | Haishen | Category 3 | 104 mph | 90 km |
| 2020 | Maysak | Category 2 | 98 mph | 204 km |
| 2019 | Francisco | Category 1 | 81 mph | 52 km |
| 2018 | Trami | Category 1 | 98 mph | 237 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 123 km |
| 2017 | Noru | Category 1 | 69 mph | 237 km |
| 2016 | Malakas | Category 3 | 109 mph | 188 km |
| 2016 | Chaba | Category 1 | 81 mph | 250 km |
| 2016 | Namtheun | Category 1 | 75 mph | 227 km |
| 2015 | Goni | Category 3 | 104 mph | 34 km |
| 2014 | Halong | Category 1 | 86 mph | 286 km |
| 2013 | Danas | Category 3 | 92 mph | 172 km |
| 2012 | Sanba | Category 3 | 104 mph | 202 km |
| 2012 | Damrey | Category 1 | 63 mph | 246 km |
| 2011 | Ma-on | Category 1 | 86 mph | 274 km |
| 2007 | Usagi | Category 3 | 104 mph | 137 km |
| 2007 | Man-yi | Category 2 | 86 mph | 165 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
4 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 | 26 km |
| 1828 | AMAKUSA SEA | Earthquake | — | — | 30 km |
| 1619 | YATSUSHIRO, JAPAN | Earthquake | — | — | 65 km |
| 744 | SW. KYUSHU ISLAND | Earthquake | — | 1,520 | 65 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
9 volcanoes within 200 km. Closest: Unzendake (26 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Unzendake | Complex | 1,483 m (4,865 ft) | 1996 | 26 km |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 99 km |
| Fukue | Shield(s) | 315 m (1,033 ft) | -400 | 114 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 116 km |
| Kirishimayama | Shield | 1,700 m (5,577 ft) | 2018 | 127 km |
| Yonemaru-Sumiyoshiike | Maar(s) | 40 m (131 ft) | -6200 | 130 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 135 km |
| Aira | Caldera | 1,117 m (3,665 ft) | 2020 | 150 km |
| Ata | Caldera(s) | 924 m (3,031 ft) | 885 | 187 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (4°C) | 2.8 in | Coldest |
| February | 41°F (5°C) | 3.7 in | |
| March | 47°F (8°C) | 5.7 in | |
| April | 56°F (14°C) | 7.2 in | |
| May | 64°F (18°C) | 8.2 in | |
| June | 70°F (21°C) | 14.8 in | |
| July | 77°F (25°C) | 15.4 in | Wettest |
| August | 79°F (26°C) | 8.5 in | Warmest |
| September | 73°F (23°C) | 8.9 in | |
| October | 63°F (17°C) | 4.2 in | |
| November | 53°F (12°C) | 3.2 in | |
| December | 44°F (7°C) | 2.4 in | Driest |
Isahaya has a seasonal temperature swing of 39°F / from 40°F in January to 79°F in August. Total annual precipitation is 84.9 inches, with July being the wettest month (15.4") and December the driest (2.4").