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Weather & Climate in Okayama, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Okayama enjoys a temperate climate with an average annual temperature of 60°F (15°C). Winters average 40°F in January while summers reach 80°F in July. The area gets 234 sunny days per year, above the national average. Annual precipitation totals 56.3 inches (wetter than the 38-inch national average). The city sits at an elevation of 16 feet.
Temperature
40°F Jan (4°C)
80°F Jul (27°C)
| Annual Average | 59.5°F |
| 10% above US avg | |
| January Average | 40°F (4°C) |
| July Average | 80°F (27°C) |
| Sunny Days | 234 days/yr |
Geography
| Elevation | 16 ft (5 m) |
| Area | 454.5 sq mi (1,177.0 km²) |
| Population Density | 1,595/sq mi |
| Coordinates | 34.6500°N, 133.9333°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
162 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.9.
| Jan 16, 1995 | 8 km S of Akashi, Japan | M6.9 | 100 km | 22 km |
| Mar 24, 2001 | 16 km SSW of Kure, Japan | M6.8 | 144 km | 50 km |
| Oct 6, 2000 | 8 km ESE of Matsue, Japan | M6.7 | 115 km | 10 km |
| Apr 12, 2013 | 6 km WNW of Sumoto, Japan | M5.8 | 88 km | 14 km |
| Apr 8, 2018 | 8 km NNE of ?dach?-?da, Japan | M5.7 | 143 km | 10 km |
| Aug 28, 1991 | 9 km SSW of Yasugich?, Japan | M5.5 | 101 km | 13 km |
| Oct 8, 2000 | 32 km N of Sh?bara, Japan | M5.4 | 98 km | 10 km |
| Sep 24, 2003 | 5 km WNW of Ayabe, Japan | M5.4 | 137 km | 372 km |
| Sep 16, 2002 | 24 km SW of Kurayoshi, Japan | M5.3 | 72 km | 10 km |
| Jan 11, 2001 | 15 km E of Tottori, Japan | M5.3 | 101 km | 33 km |
| Sep 3, 1997 | 21 km S of Yasugich?, Japan | M5.3 | 91 km | 10 km |
| Oct 8, 2000 | 8 km SSW of Yonago, Japan | M5.2 | 98 km | 10 km |
| Mar 25, 2001 | 22 km WNW of H?j?, Japan | M5.2 | 146 km | 43 km |
| Mar 13, 2019 | 22 km ESE of Anan, Japan | M5.2 | 126 km | 37 km |
| Apr 26, 2007 | 15 km ESE of Niihama, Japan | M5.1 | 94 km | 50 km |
| Jul 5, 2011 | 12 km NNW of Gob?, Japan | M5.0 | 133 km | 16 km |
| Jan 16, 1995 | 20 km SW of Akashi, Japan | M5.0 | 83 km | 10 km |
| Jun 16, 2022 | 5 km S of Komatsushimach?, Japan | M4.9 | 98 km | 40 km |
| Aug 22, 1994 | 39 km S of Anan, Japan | M4.9 | 136 km | 38 km |
| Sep 28, 1990 | 24 km NNW of Kariya, Japan | M4.9 | 44 km | 26 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
45 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2023 | Lan | Category 2 | 81 mph | 194 km |
| 2018 | Jebi | Category 3 | 98 mph | 97 km |
| 2018 | Trami | Category 1 | 92 mph | 167 km |
| 2018 | Cimaron | Category 1 | 86 mph | 70 km |
| 2018 | Jongdari | Category 1 | 75 mph | 290 km |
| 2017 | Noru | Category 1 | 69 mph | 128 km |
| 2016 | Malakas | Category 1 | 86 mph | 210 km |
| 2015 | Goni | Category 1 | 81 mph | 274 km |
| 2015 | Nangka | Category 1 | 81 mph | 187 km |
| 2014 | Phanfone | Category 2 | 92 mph | 228 km |
| 2014 | Halong | Category 1 | 81 mph | 193 km |
| 2012 | Jelawat | Category 1 | 92 mph | 245 km |
| 2011 | Roke | Category 3 | 98 mph | 265 km |
| 2011 | Ma-on | Category 1 | 86 mph | 132 km |
| 2009 | Melor | Category 1 | 86 mph | 255 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 224 km |
| 2007 | Usagi | Category 2 | 92 mph | 217 km |
| 2007 | Man-yi | Category 1 | 81 mph | 241 km |
| 2005 | Nabi | Category 1 | 75 mph | 245 km |
| 2004 | Songda | Category 2 | 86 mph | 174 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
7 tsunamis recorded within 500 km. Highest wave on record: 11.3 m (37 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1927 | SW. HONSHU ISLAND | Eruption + Earthquake | 11.3 m | 3,022 | 150 km |
| 1711 | SEIONAIKAI, JAPAN | Earthquake | 2.0 m | 1,000 | 39 km |
| 1510 | OSAKA BAY | Earthquake | 2.0 m | — | 134 km |
| 1808 | E. AWA, TOKUSHIMA PREFECTURE | Earthquake | 1.5 m | — | 115 km |
| 1995 | KOBE, JAPAN | Earthquake | 0.3 m | 6,434 | 104 km |
| 1791 | OASAKA BAY | Earthquake | — | — | 135 km |
| 745 | OSAKA BAY, JAPAN | Earthquake | — | — | 125 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Sanbesan (132 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Sanbesan | Stratovolcano | 1,126 m (3,694 ft) | 650 | 132 km |
| Oki-Dogo | Shield | 151 m (495 ft) | Unknown | 178 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (4°C) | 1.6 in | Coldest |
| February | 40°F (5°C) | 2.2 in | |
| March | 46°F (8°C) | 3.5 in | |
| April | 56°F (13°C) | 5.4 in | |
| May | 65°F (18°C) | 5.7 in | |
| June | 72°F (22°C) | 8.9 in | Wettest |
| July | 80°F (27°C) | 8.0 in | |
| August | 82°F (28°C) | 4.5 in | Warmest |
| September | 74°F (23°C) | 8.6 in | |
| October | 63°F (17°C) | 4.3 in | |
| November | 53°F (12°C) | 2.7 in | |
| December | 44°F (7°C) | 1.2 in | Driest |
Okayama has a seasonal temperature swing of 42°F / from 40°F in January to 82°F in August. Total annual precipitation is 56.3 inches, with June being the wettest month (8.9") and December the driest (1.2").