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Weather & Climate in Isehara, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Isehara enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 40°F in January while summers reach 81°F in July. The area gets 288 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 59.7 inches (wetter than the 38-inch national average). The area receives 2.5 inches of snow annually. The city sits at an elevation of 115 feet.
Temperature
40°F Jan (5°C)
81°F Jul (27°C)
| Annual Average | 62.0°F |
| 15% above US avg | |
| January Average | 40°F (5°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 288 days/yr |
Geography
| Elevation | 115 ft (35 m) |
| Area | 21.5 sq mi (55.6 km²) |
| Population Density | 4,821/sq mi |
| Coordinates | 35.3993°N, 139.3102°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
2,151 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 | 77 km | 14 km |
| Jun 1, 1990 | near the east coast of Honshu, Japan | M6.3 | 94 km | 67 km |
| Aug 10, 2009 | 8 km NE of Sagara, Japan | M6.2 | 120 km | 40 km |
| Apr 11, 2011 | 23 km SE of T?gane, Japan | M6.2 | 115 km | 15 km |
| Sep 11, 1996 | 23 km SSE of Hasaki, Japan | M6.2 | 149 km | 55 km |
| Apr 21, 2011 | 6 km WNW of T?gane, Japan | M6.2 | 92 km | 43 km |
| Jun 3, 2000 | 6 km SE of Narut?, Japan | M6.2 | 106 km | 62 km |
| Jul 1, 2000 | 53 km SSE of Shimoda, Japan | M6.1 | 132 km | 10 km |
| May 26, 2023 | 12 km SE of Narutō, Japan | M6.1 | 111 km | 42 km |
| Jul 15, 2000 | near the south coast of Honshu, Japan | M6.1 | 120 km | 10 km |
| May 4, 2014 | 31 km ESE of It?, Japan | M6.0 | 55 km | 153 km |
| Mar 14, 2012 | 5 km SE of Asahi, Japan | M6.0 | 129 km | 10 km |
| Mar 11, 2011 | 4 km ESE of Hasaki, Japan | M6.0 | 146 km | 48 km |
| Mar 15, 2011 | 6 km NNW of Fujinomiya, Japan | M6.0 | 68 km | 9 km |
| Aug 1, 2011 | 20 km E of ?yama, Japan | M5.9 | 117 km | 13 km |
| Jan 15, 2007 | 15 km WSW of Heda, Japan | M5.9 | 83 km | 170 km |
| Oct 6, 1995 | 68 km S of Shimoda, Japan | M5.9 | 149 km | 33 km |
| Jul 23, 2005 | 9 km WSW of Ichihara, Japan | M5.9 | 62 km | 61 km |
| Apr 10, 2005 | near the east coast of Honshu, Japan | M5.9 | 101 km | 43 km |
| Apr 29, 2012 | 5 km NNW of T?gane, Japan | M5.8 | 97 km | 44 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
42 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Halong | Category 3 | — | 298 km |
| 2025 | Nakri | Category 1 | — | 271 km |
| 2024 | Ampil | Category 3 | 98 mph | 218 km |
| 2024 | Jebi | Category 1 | 75 mph | 271 km |
| 2019 | Faxai | Category 4 | 98 mph | 37 km |
| 2019 | Hagibis | Category 2 | 92 mph | 24 km |
| 2018 | Jongdari | Category 2 | 86 mph | 156 km |
| 2018 | Shanshan | Category 1 | 81 mph | 176 km |
| 2017 | Lan | Category 1 | 98 mph | 295 km |
| 2016 | Mindulle | Category 1 | 75 mph | 124 km |
| 2014 | Phanfone | Category 1 | 81 mph | 100 km |
| 2013 | Wipha | Category 1 | 81 mph | 293 km |
| 2011 | Roke | Category 3 | 92 mph | 57 km |
| 2009 | Melor | Category 1 | 86 mph | 293 km |
| 2009 | Krovanh | Category 1 | 69 mph | 218 km |
| 2007 | Fitow | Category 1 | 81 mph | 24 km |
| 2005 | Saola | Category 2 | 86 mph | 276 km |
| 2005 | Mawar | Category 2 | 86 mph | 38 km |
| 2004 | Ma-on | Category 4 | 92 mph | 22 km |
| 2003 | Choi-wan | Category 3 | 81 mph | 276 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
20 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 | 38 km |
| 1703 | OFF SW BOSO PENINSULA | Earthquake | 11.7 m | 5,233 | 90 km |
| 1495 | KAMAKURA, SAGAMI BAY, TOKAIDO | Earthquake | 5.0 m | 200 | 38 km |
| 1732 | KUJUKURI BEACH, JAPAN | Earthquake | 2.0 m | — | 137 km |
| 1433 | OFF IZU-OSHIMA | Earthquake | 2.0 m | — | 58 km |
| 2009 | HONSHU: S COAST | Earthquake | 0.6 m | 1 | 120 km |
| 1980 | HONSHU ISLAND | Earthquake | 0.6 m | — | 67 km |
| 1978 | TOKAIDO | Earthquake | 0.4 m | 25 | 66 km |
| 1923 | RYUKYU ISLANDS | Earthquake | 0.3 m | — | 98 km |
| 1974 | TOKAIDO | Earthquake | 0.2 m | 30 | 105 km |
| 1990 | JAPAN | Earthquake | 0.2 m | — | 77 km |
| 2000 | HONSHU: S COAST | Earthquake | 0.1 m | — | 120 km |
| 2000 | KOZU-SHIMA ISLAND, HONSHU | Earthquake | 0.1 m | 1 | 132 km |
| 1857 | TOKAIDO | Earthquake | — | — | 114 km |
| 1855 | TOKAIDO | Earthquake | — | 6,757 | 52 km |
| 1782 | ODAWARA, SAGAMI BAY | Eruption + Earthquake | — | — | 49 km |
| 1642 | BOSO, JAPAN | Earthquake | — | — | 119 km |
| 1633 | SAGAMI BAY | Earthquake | — | 150 | 24 km |
| 1602 | BOSO, JAPAN | Eruption + Earthquake | — | — | 113 km |
| 1589 | SURUGA, JAPAN | Earthquake | — | — | 121 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Hakoneyama (32 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Hakoneyama | Complex | 1,438 m (4,718 ft) | 2015 | 32 km |
| Fujisan | Stratovolcano | 3,776 m (12,388 ft) | 1708 | 53 km |
| Izu-Tobu | Pyroclastic cone(s) | 1,406 m (4,613 ft) | 1989 | 59 km |
| Izu-Oshima | Stratovolcano | 758 m (2,487 ft) | 1990 | 76 km |
| Toshima | Stratovolcano | 508 m (1,667 ft) | -4550 | 98 km |
| Niijima | Lava dome(s) | 432 m (1,417 ft) | 886 | 112 km |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 118 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 127 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 130 km |
| Kozushima | Lava dome(s) | 572 m (1,877 ft) | 838 | 132 km |
| Asamayama | Complex | 2,568 m (8,425 ft) | 2019 | 133 km |
| Miyakejima | Stratovolcano | 775 m (2,543 ft) | 2010 | 147 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 153 km |
| Kusatsu-Shiranesan | Stratovolcano(es) | 2,165 m (7,103 ft) | 2018 | 153 km |
| Nikko-Shiranesan | Shield | 2,578 m (8,458 ft) | 1952 | 156 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (5°C) | 2.1 in | |
| February | 40°F (4°C) | 2.6 in | Coldest |
| March | 45°F (7°C) | 4.5 in | |
| April | 55°F (13°C) | 5.2 in | |
| May | 63°F (17°C) | 6.0 in | |
| June | 68°F (20°C) | 8.4 in | |
| July | 81°F (27°C) | 6.5 in | Warmest |
| August | 77°F (25°C) | 8.4 in | |
| September | 71°F (22°C) | 8.7 in | Wettest |
| October | 61°F (16°C) | 7.1 in | |
| November | 52°F (11°C) | 3.7 in | |
| December | 44°F (7°C) | 1.9 in | Driest |
Isehara has a seasonal temperature swing of 41°F / from 40°F in February to 81°F in July. Total annual precipitation is 65.0 inches, with September being the wettest month (8.7") and December the driest (1.9").