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Weather & Climate in Koga, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Koga enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 42°F in January while summers reach 79°F in July. The area gets 216 sunny days per year. Annual precipitation totals 66.1 inches (wetter than the 38-inch national average). The city sits at an elevation of 33 feet.
Temperature
42°F Jan (6°C)
79°F Jul (26°C)
| Annual Average | 60.5°F |
| 12% above US avg | |
| January Average | 42°F (6°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 216 days/yr |
Geography
| Elevation | 33 ft (10 m) |
| Area | 16.2 sq mi (42.1 km²) |
| Population Density | 3,620/sq mi |
| Coordinates | 33.7333°N, 130.4667°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
219 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 | 108 km | 10 km |
| Mar 20, 2005 | 28 km NNW of Maebaru-ch??, Japan | M6.6 | 32 km | 10 km |
| Mar 13, 2014 | 32 km SSW of Hikari, Japan | M6.3 | 126 km | 79 km |
| Jun 11, 2006 | 15 km S of Tsukawaki, Japan | M6.3 | 92 km | 140 km |
| Apr 14, 2016 | 2 km SSE of Kumamoto, Japan | M6.2 | 107 km | 9 km |
| Apr 14, 2016 | 5 km ENE of Uto, Japan | M6.0 | 118 km | 8 km |
| Jun 25, 1997 | 17 km E of Hagi, Japan | M5.9 | 128 km | 10 km |
| Apr 15, 2016 | 6 km S of Kikuchi, Japan | M5.7 | 95 km | 10 km |
| Apr 18, 2016 | 8 km NNE of Aso, Japan | M5.5 | 99 km | 10 km |
| May 22, 1998 | 9 km NE of Bungo-Takada-shi, Japan | M5.5 | 98 km | 81 km |
| Apr 19, 2005 | 8 km NNW of Maebaru-ch??, Japan | M5.5 | 29 km | 19 km |
| Jul 12, 2015 | 12 km SSW of Usuki, Japan | M5.5 | 143 km | 53 km |
| Apr 15, 2016 | 10 km NE of Aso, Japan | M5.5 | 103 km | 13 km |
| Apr 15, 2016 | 5 km WSW of Aso, Japan | M5.4 | 104 km | 4 km |
| Apr 14, 2016 | 14 km ESE of Kumamoto, Japan | M5.4 | 115 km | 10 km |
| Apr 19, 2016 | 6 km NNE of Honmachi, Japan | M5.3 | 132 km | 5 km |
| Apr 15, 2016 | 13 km ESE of Kumamoto, Japan | M5.3 | 113 km | 10 km |
| Apr 14, 2016 | 4 km NNE of Uto, Japan | M5.3 | 115 km | 10 km |
| Apr 15, 2016 | 5 km ENE of Uto, Japan | M5.3 | 116 km | 10 km |
| Oct 28, 1991 | 13 km SSW of Ube, Japan | M5.2 | 71 km | 17 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
55 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Shanshan | Category 2 | 98 mph | 138 km |
| 2022 | Nanmadol | Category 2 | 98 mph | 19 km |
| 2022 | Hinnamnor | Category 2 | 86 mph | 200 km |
| 2020 | Haishen | Category 2 | 98 mph | 133 km |
| 2020 | Maysak | Category 2 | 92 mph | 206 km |
| 2019 | Francisco | Category 1 | 81 mph | 94 km |
| 2018 | Trami | Category 1 | 98 mph | 285 km |
| 2018 | Prapiroon | Category 1 | 75 mph | 117 km |
| 2017 | Noru | Category 1 | 69 mph | 265 km |
| 2016 | Malakas | Category 2 | 86 mph | 248 km |
| 2016 | Chaba | Category 1 | 75 mph | 230 km |
| 2015 | Goni | Category 3 | 104 mph | 19 km |
| 2014 | Halong | Category 1 | 81 mph | 276 km |
| 2013 | Danas | Category 1 | 75 mph | 182 km |
| 2012 | Sanba | Category 3 | 98 mph | 222 km |
| 2011 | Ma-on | Category 1 | 86 mph | 277 km |
| 2007 | Usagi | Category 3 | 98 mph | 77 km |
| 2007 | Man-yi | Category 2 | 86 mph | 223 km |
| 2007 | Nari | Category 1 | 75 mph | 295 km |
| 2006 | Shanshan | Category 2 | 98 mph | 30 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
8 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 | 110 km |
| 1596 | BEPPU BAY, KYUSHU | Eruption + Earthquake | 8.0 m | 708 | 124 km |
| 1828 | AMAKUSA SEA | Earthquake | — | — | 137 km |
| 1715 | SEIKAIDO | Earthquake | — | — | 124 km |
| 1698 | SEIKAIDO-NANKAIDO | Earthquake | — | — | 124 km |
| 1619 | YATSUSHIRO, JAPAN | Earthquake | — | — | 138 km |
| 1597 | BEPPU BAY, JAPAN | Eruption + Earthquake | — | 40 | 116 km |
| 744 | SW. KYUSHU ISLAND | Earthquake | — | 1,520 | 148 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
6 volcanoes within 200 km. Closest: Yufu-Tsurumi (99 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 99 km |
| Kujusan | Stratovolcano(es) | 1,791 m (5,876 ft) | 1996 | 102 km |
| Unzendake | Complex | 1,483 m (4,865 ft) | 1996 | 109 km |
| Asosan | Caldera | 1,592 m (5,223 ft) | 2020 | 112 km |
| Abu | Shield(s) | 641 m (2,103 ft) | -6850 | 135 km |
| Fukue | Shield(s) | 315 m (1,033 ft) | -400 | 192 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (6°C) | 3.0 in | Coldest |
| February | 43°F (6°C) | 3.2 in | |
| March | 48°F (9°C) | 4.2 in | |
| April | 57°F (14°C) | 5.6 in | |
| May | 65°F (18°C) | 5.8 in | |
| June | 71°F (22°C) | 10.5 in | |
| July | 79°F (26°C) | 11.0 in | Wettest |
| August | 81°F (27°C) | 6.1 in | Warmest |
| September | 74°F (23°C) | 7.7 in | |
| October | 64°F (18°C) | 3.6 in | |
| November | 55°F (13°C) | 3.1 in | |
| December | 47°F (8°C) | 2.4 in | Driest |
Koga has a seasonal temperature swing of 38°F / from 42°F in January to 81°F in August. Total annual precipitation is 66.1 inches, with July being the wettest month (11.0") and December the driest (2.4").