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Weather & Climate in Sasebo, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sasebo 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 190 sunny days per year. Annual precipitation totals 82.6 inches (wetter than the 38-inch national average). The city sits at an elevation of 26 feet.
Temperature
40°F Jan (5°C)
77°F Jul (25°C)
| Annual Average | 59.0°F |
| 9% above US avg | |
| January Average | 40°F (5°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 190 days/yr |
Geography
| Elevation | 26 ft (8 m) |
| Area | 140.6 sq mi (364.1 km²) |
| Population Density | 1,479/sq mi |
| Coordinates | 33.1683°N, 129.7250°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
186 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 | 105 km | 10 km |
| Mar 20, 2005 | 28 km NNW of Maebaru-ch??, Japan | M6.6 | 80 km | 10 km |
| Jun 11, 2006 | 15 km S of Tsukawaki, Japan | M6.3 | 132 km | 140 km |
| Apr 14, 2016 | 2 km SSE of Kumamoto, Japan | M6.2 | 101 km | 9 km |
| Apr 14, 2016 | 5 km ENE of Uto, Japan | M6.0 | 107 km | 8 km |
| Apr 15, 2016 | 6 km S of Kikuchi, Japan | M5.7 | 105 km | 10 km |
| Apr 18, 2016 | 8 km NNE of Aso, Japan | M5.5 | 129 km | 10 km |
| Apr 19, 2005 | 8 km NNW of Maebaru-ch??, Japan | M5.5 | 67 km | 19 km |
| Apr 15, 2016 | 10 km NE of Aso, Japan | M5.5 | 135 km | 13 km |
| Feb 12, 1994 | 4 km WSW of ?kuchi-shinohara, Japan | M5.4 | 147 km | 31 km |
| Apr 15, 2016 | 5 km WSW of Aso, Japan | M5.4 | 124 km | 4 km |
| Apr 14, 2016 | 14 km ESE of Kumamoto, Japan | M5.4 | 113 km | 10 km |
| Apr 15, 2016 | 13 km ESE of Kumamoto, Japan | M5.3 | 112 km | 10 km |
| Apr 15, 2016 | 5 km ENE of Uto, Japan | M5.3 | 106 km | 10 km |
| Apr 14, 2016 | 4 km NNE of Uto, Japan | M5.3 | 103 km | 10 km |
| Apr 19, 2016 | 6 km NNE of Honmachi, Japan | M5.3 | 107 km | 5 km |
| Apr 15, 2016 | 13 km E of Uto, Japan | M5.2 | 114 km | 10 km |
| Apr 16, 2016 | 8 km ENE of Kumamoto, Japan | M5.2 | 105 km | 9 km |
| Apr 16, 2016 | 4 km N of Uto, Japan | M5.1 | 101 km | 9 km |
| Jun 8, 2000 | 1 km ESE of Uto, Japan | M5.0 | 105 km | 22 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
61 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Shanshan | Category 2 | 104 mph | 92 km |
| 2022 | Nanmadol | Category 2 | 104 mph | 63 km |
| 2022 | Hinnamnor | Category 2 | 86 mph | 189 km |
| 2020 | Haishen | Category 2 | 98 mph | 61 km |
| 2020 | Maysak | Category 2 | 98 mph | 170 km |
| 2019 | Francisco | Category 1 | 81 mph | 87 km |
| 2018 | Kong-rey | Category 1 | 75 mph | 294 km |
| 2018 | Trami | Category 1 | 98 mph | 284 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 86 km |
| 2017 | Noru | Category 1 | 69 mph | 284 km |
| 2016 | Malakas | Category 3 | 109 mph | 231 km |
| 2016 | Chaba | Category 2 | 81 mph | 203 km |
| 2016 | Namtheun | Category 1 | 69 mph | 264 km |
| 2015 | Goni | Category 3 | 104 mph | 75 km |
| 2014 | Neoguri | Category 1 | 69 mph | 296 km |
| 2013 | Danas | Category 3 | 92 mph | 128 km |
| 2012 | Sanba | Category 3 | 104 mph | 170 km |
| 2012 | Damrey | Category 1 | 63 mph | 267 km |
| 2007 | Usagi | Category 3 | 104 mph | 151 km |
| 2007 | Nari | Category 2 | 86 mph | 253 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 | 71 km |
| 1828 | AMAKUSA SEA | Earthquake | - | - | 65 km |
| 1619 | YATSUSHIRO, JAPAN | Earthquake | - | - | 111 km |
| 744 | SW. KYUSHU ISLAND | Earthquake | - | 1,520 | 112 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
8 volcanoes within 200 km. Closest: Unzendake (70 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Unzendake | Complex | 1,483 m (4,865 ft) | 1996 | 70 km |
| Fukue | Shield(s) | 315 m (1,033 ft) | -400 | 100 km |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 132 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 142 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 155 km |
| Kirishimayama | Shield | 1,700 m (5,577 ft) | 2018 | 174 km |
| Yonemaru-Sumiyoshiike | Maar(s) | 40 m (131 ft) | -6200 | 175 km |
| Aira | Caldera | 1,117 m (3,665 ft) | 2020 | 196 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (5°C) | 3.2 in | Coldest |
| February | 42°F (5°C) | 3.6 in | |
| March | 47°F (8°C) | 5.3 in | |
| April | 56°F (13°C) | 7.4 in | |
| May | 63°F (17°C) | 7.7 in | |
| June | 70°F (21°C) | 13.6 in | |
| July | 77°F (25°C) | 14.2 in | Wettest |
| August | 79°F (26°C) | 8.1 in | Warmest |
| September | 73°F (23°C) | 8.9 in | |
| October | 64°F (18°C) | 4.3 in | |
| November | 54°F (12°C) | 3.7 in | |
| December | 45°F (7°C) | 2.7 in | Driest |
Sasebo has a seasonal temperature swing of 39°F / from 40°F in January to 79°F in August. Total annual precipitation is 82.6 inches, with July being the wettest month (14.2") and December the driest (2.7").