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Weather & Climate in Suwa, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Suwa experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 26°F in January while summers reach 68°F in July. The area gets 239 sunny days per year, above the national average. Annual precipitation totals 53.2 inches (wetter than the 38-inch national average). The area receives 7.9 inches of snow annually. The city sits at an elevation of 2,500 feet.
Temperature
26°F Jan (-3°C)
68°F Jul (20°C)
| Annual Average | 47.7°F |
| 12% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 239 days/yr |
Geography
| Elevation | 2,500 ft (762 m) |
| Area | 42.2 sq mi (109.2 km²) |
| Population Density | 1,162/sq mi |
| Coordinates | 36.0380°N, 138.1131°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
621 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.2.
| Aug 10, 2009 | 8 km NE of Sagara, Japan | M6.2 | 145 km | 40 km |
| Mar 11, 2011 | 13 km E of Arai, Japan | M6.2 | 111 km | 9 km |
| Mar 15, 2011 | 6 km NNW of Fujinomiya, Japan | M6.0 | 95 km | 9 km |
| Jan 15, 2007 | 15 km WSW of Heda, Japan | M5.9 | 136 km | 170 km |
| Feb 25, 2013 | 29 km NE of Numata, Japan | M5.8 | 135 km | 10 km |
| Apr 16, 2011 | 6 km ENE of Tanuma, Japan | M5.8 | 143 km | 77 km |
| Mar 11, 2011 | eastern Honshu, Japan | M5.7 | 102 km | 12 km |
| Mar 16, 1997 | 5 km NE of Toyokawa, Japan | M5.6 | 145 km | 36 km |
| Mar 6, 1996 | 13 km NNE of Gotenba, Japan | M5.6 | 104 km | 33 km |
| Feb 15, 2005 | 2 km NNW of Iwatsuki, Japan | M5.5 | 142 km | 46 km |
| Mar 15, 2012 | 3 km ENE of ?me, Japan | M5.5 | 108 km | 104 km |
| Apr 11, 2011 | 8 km WSW of Iiyama, Japan | M5.5 | 87 km | 17 km |
| Dec 21, 1996 | 3 km E of Sugito, Japan | M5.5 | 149 km | 45 km |
| Aug 15, 1998 | 22 km WSW of Hotaka, Japan | M5.5 | 49 km | 10 km |
| Apr 3, 2001 | 10 km NE of Mori, Japan | M5.4 | 127 km | 33 km |
| Aug 26, 2010 | 25 km ENE of Katsuyama, Japan | M5.4 | 121 km | 278 km |
| Jan 4, 2001 | 20 km WSW of Shiozawa, Japan | M5.3 | 115 km | 21 km |
| Jun 5, 1990 | 13 km NE of Gotenba, Japan | M5.3 | 109 km | 122 km |
| Oct 5, 2011 | 24 km W of ?machi, Japan | M5.3 | 68 km | 10 km |
| Dec 7, 1990 | 17 km SSW of Kashiwazaki, Japan | M5.3 | 136 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
32 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2019 | Faxai | Category 3 | 98 mph | 165 km |
| 2019 | Hagibis | Category 2 | 92 mph | 126 km |
| 2018 | Jebi | Category 2 | 98 mph | 195 km |
| 2018 | Jongdari | Category 1 | 81 mph | 194 km |
| 2016 | Mindulle | Category 1 | 75 mph | 231 km |
| 2014 | Phanfone | Category 1 | 81 mph | 129 km |
| 2011 | Roke | Category 2 | 92 mph | 99 km |
| 2009 | Melor | Category 1 | 86 mph | 265 km |
| 2007 | Fitow | Category 1 | 81 mph | 109 km |
| 2005 | Mawar | Category 2 | 81 mph | 163 km |
| 2004 | Ma-on | Category 3 | 92 mph | 142 km |
| 2004 | Chaba | Category 1 | 69 mph | 235 km |
| 2003 | Etau | Category 1 | 58 mph | 179 km |
| 2002 | Higos | Category 2 | 86 mph | 162 km |
| 2001 | Danas | Category 1 | 81 mph | 156 km |
| 2000 | Kirogi | Category 1 | 86 mph | 248 km |
| 1998 | Vicki | Category 2 | 86 mph | 92 km |
| 1998 | Zeb | Category 1 | 58 mph | 222 km |
| 1998 | Stella | Category 1 | 69 mph | 137 km |
| 1997 | Opal | Category 1 | 69 mph | 289 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
9 tsunamis recorded within 500 km. Highest wave on record: 0.6 m (2 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2009 | HONSHU: S COAST | Earthquake | 0.6 m | 1 | 145 km |
| 1857 | TOKAIDO | Earthquake | - | - | 139 km |
| 1799 | SW. HONSHU ISLAND | Earthquake | - | - | 149 km |
| 1751 | NW. HONSHU ISLAND | Eruption + Earthquake | - | 2,100 | 129 km |
| 1633 | SAGAMI BAY | Earthquake | - | 150 | 135 km |
| 1589 | SURUGA, JAPAN | Earthquake | - | - | 138 km |
| 1241 | KAMAKURA, SAGAMI BAY | Earthquake | - | - | 149 km |
| 863 | NW. HONSHU ISLAND | Eruption + Earthquake | - | - | 119 km |
| 818 | TOKAIDO | Eruption + Earthquake | - | - | 142 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Yokodake (19 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 19 km |
| Norikuradake | Stratovolcano(es) | 3,026 m (9,928 ft) | -50 | 51 km |
| Yakedake | Stratovolcano(es) | 2,455 m (8,054 ft) | 1995 | 52 km |
| Asamayama | Complex | 2,568 m (8,425 ft) | 2019 | 55 km |
| Ontakesan | Complex | 3,067 m (10,062 ft) | 2014 | 59 km |
| Washiba-Kumonotaira | Shield(s) | 2,924 m (9,593 ft) | Unknown | 62 km |
| Kusatsu-Shiranesan | Stratovolcano(es) | 2,165 m (7,103 ft) | 2018 | 74 km |
| Midagahara | Stratovolcano | 2,621 m (8,599 ft) | 1839 | 76 km |
| Shiga | Shield(s) | 2,041 m (6,696 ft) | Unknown | 81 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 82 km |
| Fujisan | Stratovolcano | 3,776 m (12,388 ft) | 1708 | 94 km |
| Myokosan | Stratovolcano | 2,454 m (8,051 ft) | -750 | 95 km |
| Niigata-Yakeyama | Lava dome | 2,400 m (7,874 ft) | 1998 | 98 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 113 km |
| Hakusan | Stratovolcano | 2,702 m (8,865 ft) | 1659 | 121 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 1.4 in | Coldest |
| February | 27°F (-3°C) | 2.0 in | |
| March | 33°F (1°C) | 3.3 in | |
| April | 46°F (8°C) | 4.3 in | |
| May | 55°F (13°C) | 4.8 in | |
| June | 62°F (16°C) | 7.6 in | |
| July | 68°F (20°C) | 7.2 in | |
| August | 70°F (21°C) | 6.5 in | Warmest |
| September | 63°F (17°C) | 8.0 in | Wettest |
| October | 51°F (11°C) | 4.5 in | |
| November | 41°F (5°C) | 2.4 in | |
| December | 32°F (-0°C) | 1.2 in | Driest |
Suwa has a seasonal temperature swing of 45°F / from 26°F in January to 70°F in August. Total annual precipitation is 53.2 inches, with September being the wettest month (8.0") and December the driest (1.2").