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Weather & Climate in Iwata, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Iwata enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 42°F in January while summers reach 77°F in July. The area gets 184 sunny days per year. Annual precipitation totals 83.9 inches (wetter than the 38-inch national average). The city sits at an elevation of 16 feet.
Temperature
42°F Jan (6°C)
77°F Jul (25°C)
| Annual Average | 60.5°F |
| 12% above US avg | |
| January Average | 42°F (6°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 184 days/yr |
Geography
| Elevation | 16 ft (5 m) |
| Area | 63.4 sq mi (164.1 km²) |
| Population Density | 2,631/sq mi |
| Coordinates | 34.7000°N, 137.8500°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
1,140 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.4.
| Feb 20, 1990 | 28 km E of Shimoda, Japan | M6.4 | 128 km | 14 km |
| Sep 3, 1991 | 115 km S of Shimoda, Japan | M6.4 | 145 km | 27 km |
| Aug 10, 2009 | 8 km NE of Sagara, Japan | M6.2 | 38 km | 40 km |
| Jul 15, 2000 | near the south coast of Honshu, Japan | M6.1 | 136 km | 10 km |
| Jul 1, 2000 | 53 km SSE of Shimoda, Japan | M6.1 | 129 km | 10 km |
| Jul 7, 1995 | 62 km SSE of Toba, Japan | M6.0 | 105 km | 333 km |
| Mar 15, 2011 | 6 km NNW of Fujinomiya, Japan | M6.0 | 92 km | 9 km |
| May 4, 2014 | 31 km ESE of It?, Japan | M6.0 | 145 km | 153 km |
| Oct 6, 1995 | 68 km S of Shimoda, Japan | M5.9 | 133 km | 33 km |
| Jan 15, 2007 | 15 km WSW of Heda, Japan | M5.9 | 75 km | 170 km |
| Aug 1, 2011 | 20 km E of ?yama, Japan | M5.9 | 54 km | 13 km |
| Jul 8, 2000 | 71 km SSE of Shimoda, Japan | M5.9 | 137 km | 10 km |
| May 23, 1997 | 38 km SSE of Tahara, Japan | M5.8 | 50 km | 11 km |
| Feb 28, 1998 | 127 km S of ?yama, Japan | M5.7 | 140 km | 291 km |
| Jul 2, 2000 | 71 km SSE of Shimoda, Japan | M5.7 | 144 km | 10 km |
| Aug 18, 2000 | 64 km SSE of Shimoda, Japan | M5.7 | 138 km | 10 km |
| Nov 18, 2013 | 25 km SE of Toba, Japan | M5.6 | 84 km | 328 km |
| Mar 16, 1997 | 5 km NE of Toyokawa, Japan | M5.6 | 41 km | 36 km |
| Oct 18, 1996 | 102 km SSE of Toba, Japan | M5.6 | 120 km | 338 km |
| Mar 6, 1996 | 13 km NNE of Gotenba, Japan | M5.6 | 132 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
52 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Halong | Category 4 | - | 284 km |
| 2025 | Nakri | Category 1 | - | 265 km |
| 2024 | Ampil | Category 3 | 98 mph | 289 km |
| 2023 | Lan | Category 2 | 81 mph | 227 km |
| 2019 | Faxai | Category 4 | 98 mph | 125 km |
| 2019 | Hagibis | Category 2 | 92 mph | 79 km |
| 2018 | Jebi | Category 2 | 98 mph | 223 km |
| 2018 | Trami | Category 1 | 92 mph | 238 km |
| 2018 | Cimaron | Category 1 | 86 mph | 288 km |
| 2018 | Shanshan | Category 1 | 75 mph | 297 km |
| 2018 | Jongdari | Category 1 | 81 mph | 69 km |
| 2017 | Lan | Category 2 | 104 mph | 157 km |
| 2017 | Noru | Category 1 | 63 mph | 264 km |
| 2016 | Mindulle | Category 1 | 75 mph | 158 km |
| 2014 | Phanfone | Category 1 | 86 mph | 18 km |
| 2013 | Wipha | Category 1 | 81 mph | 229 km |
| 2011 | Roke | Category 3 | 98 mph | 23 km |
| 2010 | Chaba | Category 1 | 75 mph | 225 km |
| 2009 | Melor | Category 1 | 86 mph | 139 km |
| 2009 | Krovanh | Category 1 | 69 mph | 231 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
20 tsunamis recorded within 500 km. Highest wave on record: 21.0 m (69 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1854 | ENSHUNADA SEA | Earthquake | 21.0 m | 1,000 | 78 km |
| 1707 | ENSHUNADA | Earthquake | 11.0 m | 2,000 | 67 km |
| 1944 | OFF SOUTHEAST COAST KII PENINSULA | Earthquake | 10.0 m | 1,223 | 104 km |
| 1498 | ENSHUNADA SEA | Earthquake | 10.0 m | 5,000 | 81 km |
| 1096 | ENSHUNADA | Earthquake | 7.0 m | - | 84 km |
| 1855 | ENSHUNADA | Earthquake | 3.0 m | - | 32 km |
| 1408 | KUMANONADA | Earthquake | 2.0 m | - | 133 km |
| 922 | KUMANONADA | Earthquake | 2.0 m | - | 146 km |
| 1945 | TOKAIDO | Earthquake | 1.0 m | 2,306 | 59 km |
| 2009 | HONSHU: S COAST | Earthquake | 0.6 m | 1 | 38 km |
| 1980 | HONSHU ISLAND | Earthquake | 0.6 m | - | 122 km |
| 1978 | TOKAIDO | Earthquake | 0.4 m | 25 | 129 km |
| 1974 | TOKAIDO | Earthquake | 0.2 m | 30 | 79 km |
| 1990 | JAPAN | Earthquake | 0.2 m | - | 128 km |
| 2000 | KOZU-SHIMA ISLAND, HONSHU | Earthquake | 0.1 m | 1 | 129 km |
| 2000 | HONSHU: S COAST | Earthquake | 0.1 m | - | 136 km |
| 1857 | TOKAIDO | Earthquake | - | - | 43 km |
| 1708 | TOKAIDO | Earthquake | - | - | 110 km |
| 1666 | AICHI PREFECTURE | Earthquake | - | - | 102 km |
| 1633 | SAGAMI BAY | Earthquake | - | 150 | 135 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Fujisan (109 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Fujisan | Stratovolcano | 3,776 m (12,388 ft) | 1708 | 109 km |
| Izu-Tobu | Pyroclastic cone(s) | 1,406 m (4,613 ft) | 1989 | 116 km |
| Hakoneyama | Complex | 1,438 m (4,718 ft) | 2015 | 122 km |
| Kozushima | Lava dome(s) | 572 m (1,877 ft) | 838 | 131 km |
| Toshima | Stratovolcano | 508 m (1,667 ft) | -4550 | 132 km |
| Niijima | Lava dome(s) | 432 m (1,417 ft) | 886 | 134 km |
| Ontakesan | Complex | 3,067 m (10,062 ft) | 2014 | 137 km |
| Izu-Oshima | Stratovolcano | 758 m (2,487 ft) | 1990 | 141 km |
| Norikuradake | Stratovolcano(es) | 3,026 m (9,928 ft) | -50 | 159 km |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 160 km |
| Miyakejima | Stratovolcano | 775 m (2,543 ft) | 2010 | 168 km |
| Yakedake | Stratovolcano(es) | 2,455 m (8,054 ft) | 1995 | 172 km |
| Mikurajima | Stratovolcano | 851 m (2,792 ft) | -4100 | 185 km |
| Hakusan | Stratovolcano | 2,702 m (8,865 ft) | 1659 | 189 km |
| Washiba-Kumonotaira | Shield(s) | 2,924 m (9,593 ft) | Unknown | 191 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (6°C) | 3.2 in | Coldest |
| February | 43°F (6°C) | 3.9 in | |
| March | 49°F (9°C) | 6.6 in | |
| April | 58°F (14°C) | 8.0 in | |
| May | 65°F (18°C) | 8.4 in | |
| June | 71°F (22°C) | 11.4 in | Wettest |
| July | 77°F (25°C) | 8.9 in | |
| August | 80°F (27°C) | 8.4 in | Warmest |
| September | 75°F (24°C) | 9.3 in | |
| October | 65°F (18°C) | 7.9 in | |
| November | 56°F (13°C) | 5.0 in | |
| December | 46°F (8°C) | 3.0 in | Driest |
Iwata has a seasonal temperature swing of 38°F / from 42°F in January to 80°F in August. Total annual precipitation is 83.9 inches, with June being the wettest month (11.4") and December the driest (3.0").