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Weather & Climate in Iwase, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Iwase enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 36°F in January while summers reach 74°F in July. The area gets 241 sunny days per year, above the national average. Annual precipitation totals 52.2 inches (wetter than the 38-inch national average). The city sits at an elevation of 161 feet.
Temperature
36°F Jan (2°C)
74°F Jul (23°C)
| Annual Average | 55.6°F |
| 3% above US avg | |
| January Average | 36°F (2°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 241 days/yr |
Geography
| Elevation | 161 ft (49 m) |
| Area | 74.3 sq mi (192.5 km²) |
| Population Density | 526/sq mi |
| Coordinates | 36.3500°N, 140.1000°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
3,369 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.9.
| Mar 11, 2011 | 47 km E of ?arai, Japan | M7.9 | 91 km | 43 km |
| May 7, 2008 | 78 km NE of Hasaki, Japan | M6.9 | 130 km | 27 km |
| Apr 11, 2011 | 17 km SSW of Ishikawa, Japan | M6.6 | 77 km | 11 km |
| Mar 11, 2011 | 81 km NE of Hasaki, Japan | M6.5 | 133 km | 7 km |
| Jun 1, 1990 | near the east coast of Honshu, Japan | M6.3 | 95 km | 67 km |
| Jul 30, 2011 | 13 km SSE of Iwaki, Japan | M6.3 | 101 km | 38 km |
| Apr 11, 2011 | 23 km SE of T?gane, Japan | M6.2 | 112 km | 15 km |
| May 7, 2008 | 80 km NE of Hasaki, Japan | M6.2 | 131 km | 19 km |
| Jun 3, 2000 | 6 km SE of Narut?, Japan | M6.2 | 95 km | 62 km |
| Sep 11, 1996 | 23 km SSE of Hasaki, Japan | M6.2 | 118 km | 55 km |
| Mar 11, 2011 | 70 km ESE of Kitaibaraki, Japan | M6.2 | 126 km | 40 km |
| Apr 21, 2011 | 6 km WNW of T?gane, Japan | M6.2 | 88 km | 43 km |
| May 26, 2023 | 12 km SE of Narutō, Japan | M6.1 | 99 km | 42 km |
| Sep 15, 2011 | 68 km E of ?arai, Japan | M6.1 | 111 km | 28 km |
| Mar 12, 2011 | 29 km SSE of Namie, Japan | M6.1 | 137 km | 38 km |
| Aug 5, 1990 | 43 km E of ?arai, Japan | M6.1 | 87 km | 27 km |
| May 7, 2008 | 95 km ENE of Hasaki, Japan | M6.1 | 150 km | 23 km |
| Aug 6, 1991 | 19 km E of Hasaki, Japan | M6.0 | 110 km | 29 km |
| Jul 20, 2000 | 31 km ESE of Hitachi, Japan | M6.0 | 81 km | 47 km |
| Mar 11, 2011 | 4 km ESE of Hasaki, Japan | M6.0 | 99 km | 48 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
31 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Ampil | Category 3 | 98 mph | 228 km |
| 2024 | Jebi | Category 1 | 75 mph | 230 km |
| 2019 | Faxai | Category 3 | 98 mph | 64 km |
| 2019 | Hagibis | Category 2 | 92 mph | 71 km |
| 2018 | Shanshan | Category 1 | 75 mph | 195 km |
| 2018 | Jongdari | Category 1 | 81 mph | 269 km |
| 2016 | Lionrock | Category 1 | 81 mph | 230 km |
| 2016 | Mindulle | Category 1 | 75 mph | 234 km |
| 2014 | Phanfone | Category 1 | 75 mph | 223 km |
| 2011 | Roke | Category 2 | 92 mph | 95 km |
| 2007 | Fitow | Category 1 | 81 mph | 116 km |
| 2005 | Mawar | Category 2 | 81 mph | 75 km |
| 2004 | Ma-on | Category 3 | 92 mph | 88 km |
| 2002 | Higos | Category 2 | 86 mph | 53 km |
| 2001 | Danas | Category 1 | 81 mph | 27 km |
| 2000 | Sonamu | Category 1 | 63 mph | 274 km |
| 2000 | Kirogi | Category 1 | 86 mph | 109 km |
| 1998 | Vicki | Category 2 | 63 mph | 236 km |
| 1998 | Stella | Category 1 | 69 mph | 40 km |
| 1996 | Violet | Category 1 | 81 mph | 167 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
16 tsunamis recorded within 500 km. Highest wave on record: 13.0 m (43 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1923 | SAGAMI BAY | Earthquake | 13.0 m | 105,385 | 149 km |
| 1495 | KAMAKURA, SAGAMI BAY, TOKAIDO | Earthquake | 5.0 m | 200 | 149 km |
| 1732 | KUJUKURI BEACH, JAPAN | Earthquake | 2.0 m | - | 143 km |
| 1670 | BOSO, JAPAN | Earthquake | 2.0 m | - | 125 km |
| 1938 | JAPAN TRENCH | Earthquake | 0.8 m | - | 123 km |
| 1938 | SANRIKU | Earthquake | 0.8 m | - | 144 km |
| 1982 | IBARAKI, JAPAN | Earthquake | 0.4 m | - | 145 km |
| 1896 | KASHIMA, JAPAN | Earthquake | 0.3 m | - | 82 km |
| 1935 | JAPAN | Earthquake | 0.2 m | - | 120 km |
| 1855 | TOKAIDO | Earthquake | - | 6,757 | 82 km |
| 1782 | ODAWARA, SAGAMI BAY | Eruption + Earthquake | - | - | 144 km |
| 1642 | BOSO, JAPAN | Earthquake | - | - | 136 km |
| 1602 | BOSO, JAPAN | Eruption + Earthquake | - | - | 144 km |
| 1257 | SAGAMI BAY, JAPAN | Earthquake | - | - | 139 km |
| 1241 | KAMAKURA, SAGAMI BAY | Earthquake | - | - | 143 km |
| 818 | TOKAIDO | Eruption + Earthquake | - | - | 147 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Takaharayama (68 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Takaharayama | Stratovolcano | 1,795 m (5,889 ft) | -4570 | 68 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 71 km |
| Omanago Group | Lava dome(s) | 2,341 m (7,680 ft) | -3050 | 73 km |
| Nikko-Shiranesan | Shield | 2,578 m (8,458 ft) | 1952 | 82 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 84 km |
| Nasudake | Stratovolcano(es) | 1,915 m (6,283 ft) | 1963 | 87 km |
| Hiuchigatake | Stratovolcano | 2,356 m (7,730 ft) | 1544 | 99 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 113 km |
| Numazawa | Shield | 835 m (2,740 ft) | -3400 | 131 km |
| Bandaisan | Stratovolcano | 1,816 m (5,958 ft) | 1888 | 139 km |
| Asamayama | Complex | 2,568 m (8,425 ft) | 2019 | 141 km |
| Kusatsu-Shiranesan | Stratovolcano(es) | 2,165 m (7,103 ft) | 2018 | 144 km |
| Adatarayama | Stratovolcano(es) | 1,728 m (5,669 ft) | 1996 | 145 km |
| Shiga | Shield(s) | 2,041 m (6,696 ft) | Unknown | 146 km |
| Azumayama | Stratovolcano(es) | 1,949 m (6,394 ft) | 1977 | 155 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 36°F (2°C) | 1.3 in | Coldest, Driest |
| February | 37°F (3°C) | 2.0 in | |
| March | 43°F (6°C) | 3.3 in | |
| April | 53°F (12°C) | 4.4 in | |
| May | 61°F (16°C) | 5.0 in | |
| June | 67°F (20°C) | 6.5 in | |
| July | 74°F (23°C) | 5.9 in | |
| August | 77°F (25°C) | 5.9 in | Warmest |
| September | 70°F (21°C) | 7.2 in | Wettest |
| October | 60°F (15°C) | 6.3 in | |
| November | 50°F (10°C) | 2.9 in | |
| December | 40°F (5°C) | 1.5 in |
Iwase has a seasonal temperature swing of 41°F / from 36°F in January to 77°F in August. Total annual precipitation is 52.3 inches, with September being the wettest month (7.2") and January the driest (1.3").