Weather & Climate in Isogo, Japan

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Isogo 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 56 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	56 ft (17 m)
Area	221.7 sq mi (574.2 km²)
Population Density	75/sq mi
Coordinates	35.4082°N, 139.6191°W
Timezone	Asia/Tokyo

Precipitation & Snow

Annual Rainfall 59.7"

57% above US avg

Snowfall 2.5"

Wettest Month (Sep) 8.50"

Driest Month (Dec) 2.05"

Air Quality

Earthquake History

2,465 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	85 km	14 km
Jun 1, 1990	near the east coast of Honshu, Japan	M6.3	66 km	67 km
Sep 11, 1996	23 km SSE of Hasaki, Japan	M6.2	121 km	55 km
Jun 3, 2000	6 km SE of Narut?, Japan	M6.2	78 km	62 km
Apr 11, 2011	23 km SE of T?gane, Japan	M6.2	87 km	15 km
Apr 21, 2011	6 km WNW of T?gane, Japan	M6.2	65 km	43 km
Aug 10, 2009	8 km NE of Sagara, Japan	M6.2	144 km	40 km
Jun 5, 2012	75 km ESE of ?hara, Japan	M6.1	147 km	15 km
Jul 15, 2000	near the south coast of Honshu, Japan	M6.1	126 km	10 km
May 26, 2023	12 km SE of Narutō, Japan	M6.1	83 km	42 km
Jul 1, 2000	53 km SSE of Shimoda, Japan	M6.1	139 km	10 km
Mar 15, 2011	6 km NNW of Fujinomiya, Japan	M6.0	95 km	9 km
Mar 14, 2012	5 km SE of Asahi, Japan	M6.0	102 km	10 km
Mar 11, 2011	4 km ESE of Hasaki, Japan	M6.0	119 km	48 km
Aug 6, 1991	19 km E of Hasaki, Japan	M6.0	134 km	29 km
May 4, 2014	31 km ESE of It?, Japan	M6.0	58 km	153 km
Apr 10, 2005	near the east coast of Honshu, Japan	M5.9	74 km	43 km
Jun 24, 2020	36 km SE of Hasaki, Japan	M5.9	132 km	29 km
Jan 15, 2007	15 km WSW of Heda, Japan	M5.9	106 km	170 km
Aug 1, 2011	20 km E of ?yama, Japan	M5.9	138 km	13 km

Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.

Hurricane History

44 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.

Year	Name	Category	Max Wind	Closest
2025	Halong	Category 3	-	293 km
2025	Nakri	Category 1	-	264 km
2024	Ampil	Category 3	98 mph	199 km
2024	Jebi	Category 1	75 mph	244 km
2019	Faxai	Category 4	98 mph	14 km
2019	Hagibis	Category 2	92 mph	29 km
2018	Jongdari	Category 2	86 mph	158 km
2018	Shanshan	Category 1	81 mph	151 km
2016	Lionrock	Category 1	75 mph	275 km
2016	Mindulle	Category 1	75 mph	124 km
2014	Phanfone	Category 1	81 mph	124 km
2013	Wipha	Category 1	81 mph	300 km
2011	Roke	Category 2	92 mph	67 km
2009	Krovanh	Category 1	69 mph	214 km
2007	Fitow	Category 1	81 mph	44 km
2005	Saola	Category 2	86 mph	254 km
2005	Mawar	Category 2	86 mph	20 km
2004	Ma-on	Category 4	92 mph	27 km
2003	Choi-wan	Category 3	81 mph	265 km
2002	Higos	Category 2	92 mph	23 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	36 km
1703	OFF SW BOSO PENINSULA	Earthquake	11.7 m	5,233	81 km
1495	KAMAKURA, SAGAMI BAY, TOKAIDO	Earthquake	5.0 m	200	36 km
1732	KUJUKURI BEACH, JAPAN	Earthquake	2.0 m	-	110 km
1670	BOSO, JAPAN	Earthquake	2.0 m	-	126 km
1433	OFF IZU-OSHIMA	Earthquake	2.0 m	-	58 km
2009	HONSHU: S COAST	Earthquake	0.6 m	1	144 km
1980	HONSHU ISLAND	Earthquake	0.6 m	-	78 km
1978	TOKAIDO	Earthquake	0.4 m	25	74 km
1923	RYUKYU ISLANDS	Earthquake	0.3 m	-	77 km
1974	TOKAIDO	Earthquake	0.2 m	30	123 km
1990	JAPAN	Earthquake	0.2 m	-	85 km
2000	HONSHU: S COAST	Earthquake	0.1 m	-	126 km
2000	KOZU-SHIMA ISLAND, HONSHU	Earthquake	0.1 m	1	139 km
1857	TOKAIDO	Earthquake	-	-	138 km
1855	TOKAIDO	Earthquake	-	6,757	32 km
1782	ODAWARA, SAGAMI BAY	Eruption + Earthquake	-	-	35 km
1642	BOSO, JAPAN	Earthquake	-	-	92 km
1633	SAGAMI BAY	Earthquake	-	150	45 km
1602	BOSO, JAPAN	Eruption + Earthquake	-	-	87 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

15 volcanoes within 200 km. Closest: Hakoneyama (58 km).

Name	Type	Elevation	Last Eruption	Distance
Hakoneyama	Complex	1,438 m (4,718 ft)	2015	58 km
Izu-Tobu	Pyroclastic cone(s)	1,406 m (4,613 ft)	1989	74 km
Izu-Oshima	Stratovolcano	758 m (2,487 ft)	1990	79 km
Fujisan	Stratovolcano	3,776 m (12,388 ft)	1708	81 km
Toshima	Stratovolcano	508 m (1,667 ft)	-4550	104 km
Niijima	Lava dome(s)	432 m (1,417 ft)	886	117 km
Akagisan	Stratovolcano	1,828 m (5,997 ft)	Unknown	134 km
Harunasan	Stratovolcano	1,449 m (4,754 ft)	550	138 km
Kozushima	Lava dome(s)	572 m (1,877 ft)	838	139 km
Yokodake	Stratovolcano(es)	2,480 m (8,136 ft)	1200	139 km
Miyakejima	Stratovolcano	775 m (2,543 ft)	2010	146 km
Asamayama	Complex	2,568 m (8,425 ft)	2019	149 km
Nantaisan	Stratovolcano	2,486 m (8,156 ft)	-9540	151 km
Omanago Group	Lava dome(s)	2,341 m (7,680 ft)	-3050	155 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)	2.2 in	Coldest
February	43°F (6°C)	2.8 in
March	48°F (9°C)	5.0 in
April	58°F (14°C)	5.6 in
May	65°F (18°C)	6.2 in
June	71°F (22°C)	8.4 in
July	81°F (27°C)	6.4 in	Warmest
August	80°F (27°C)	6.9 in
September	74°F (23°C)	8.5 in	Wettest
October	64°F (18°C)	7.7 in
November	55°F (13°C)	4.2 in
December	46°F (8°C)	2.1 in	Driest

Isogo has a seasonal temperature swing of 41°F / from 40°F in January to 81°F in July. Total annual precipitation is 65.8 inches, with September being the wettest month (8.5") and December the driest (2.1").

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