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Weather & Climate in Hamamatsu, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hamamatsu enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 42°F in January while summers reach 78°F in July. The area gets 192 sunny days per year. Annual precipitation totals 79.6 inches (wetter than the 38-inch national average). The city sits at an elevation of 10 feet.
Temperature
42°F Jan (6°C)
78°F Jul (26°C)
| Annual Average | 60.9°F |
| 13% above US avg | |
| January Average | 42°F (6°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 192 days/yr |
Geography
| Elevation | 10 ft (3 m) |
| Area | 1,310.2 sq mi (3,393.5 km²) |
| Population Density | 604/sq mi |
| Coordinates | 34.7000°N, 137.7333°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
939 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 | 139 km | 14 km |
| Aug 10, 2009 | 8 km NE of Sagara, Japan | M6.2 | 49 km | 40 km |
| Jul 1, 2000 | 53 km SSE of Shimoda, Japan | M6.1 | 139 km | 10 km |
| Jul 15, 2000 | near the south coast of Honshu, Japan | M6.1 | 146 km | 10 km |
| Jul 7, 1995 | 62 km SSE of Toba, Japan | M6.0 | 98 km | 333 km |
| Mar 15, 2011 | 6 km NNW of Fujinomiya, Japan | M6.0 | 100 km | 9 km |
| Jan 15, 2007 | 15 km WSW of Heda, Japan | M5.9 | 86 km | 170 km |
| Aug 1, 2011 | 20 km E of ?yama, Japan | M5.9 | 64 km | 13 km |
| Jul 8, 2000 | 71 km SSE of Shimoda, Japan | M5.9 | 147 km | 10 km |
| Oct 6, 1995 | 68 km S of Shimoda, Japan | M5.9 | 142 km | 33 km |
| May 23, 1997 | 38 km SSE of Tahara, Japan | M5.8 | 43 km | 11 km |
| Aug 18, 2000 | 64 km SSE of Shimoda, Japan | M5.7 | 147 km | 10 km |
| Feb 28, 1998 | 127 km S of ?yama, Japan | M5.7 | 143 km | 291 km |
| Apr 20, 2006 | 16 km SE of It?, Japan | M5.6 | 136 km | 23 km |
| Jul 23, 2000 | 63 km SSE of Shimoda, Japan | M5.6 | 142 km | 10 km |
| Nov 18, 2013 | 25 km SE of Toba, Japan | M5.6 | 75 km | 328 km |
| Oct 18, 1996 | 102 km SSE of Toba, Japan | M5.6 | 117 km | 338 km |
| Mar 4, 1997 | 9 km SSW of It?, Japan | M5.6 | 121 km | 10 km |
| Mar 6, 1996 | 13 km NNE of Gotenba, Japan | M5.6 | 140 km | 33 km |
| May 3, 1998 | 14 km SW of It?, Japan | M5.6 | 116 km | 34 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
53 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Halong | Category 4 | - | 289 km |
| 2025 | Nakri | Category 1 | - | 270 km |
| 2024 | Ampil | Category 3 | 98 mph | 299 km |
| 2023 | Lan | Category 2 | 81 mph | 218 km |
| 2019 | Faxai | Category 4 | 98 mph | 134 km |
| 2019 | Hagibis | Category 2 | 92 mph | 89 km |
| 2018 | Jebi | Category 2 | 98 mph | 214 km |
| 2018 | Trami | Category 1 | 92 mph | 228 km |
| 2018 | Cimaron | Category 1 | 86 mph | 278 km |
| 2018 | Jongdari | Category 1 | 81 mph | 62 km |
| 2017 | Lan | Category 2 | 104 mph | 153 km |
| 2017 | Noru | Category 1 | 69 mph | 254 km |
| 2016 | Mindulle | Category 1 | 75 mph | 168 km |
| 2014 | Phanfone | Category 1 | 86 mph | 12 km |
| 2013 | Wipha | Category 1 | 81 mph | 233 km |
| 2011 | Roke | Category 3 | 98 mph | 23 km |
| 2010 | Chaba | Category 1 | 75 mph | 227 km |
| 2009 | Melor | Category 1 | 86 mph | 130 km |
| 2009 | Krovanh | Category 1 | 69 mph | 240 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 154 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 | 79 km |
| 1707 | ENSHUNADA | Earthquake | 11.0 m | 2,000 | 67 km |
| 1944 | OFF SOUTHEAST COAST KII PENINSULA | Earthquake | 10.0 m | 1,223 | 97 km |
| 1498 | ENSHUNADA SEA | Earthquake | 10.0 m | 5,000 | 85 km |
| 1096 | ENSHUNADA | Earthquake | 7.0 m | - | 81 km |
| 1855 | ENSHUNADA | Earthquake | 3.0 m | - | 25 km |
| 1408 | KUMANONADA | Earthquake | 2.0 m | - | 126 km |
| 922 | KUMANONADA | Earthquake | 2.0 m | - | 138 km |
| 1945 | TOKAIDO | Earthquake | 1.0 m | 2,306 | 49 km |
| 2009 | HONSHU: S COAST | Earthquake | 0.6 m | 1 | 49 km |
| 1980 | HONSHU ISLAND | Earthquake | 0.6 m | - | 133 km |
| 1978 | TOKAIDO | Earthquake | 0.4 m | 25 | 140 km |
| 1974 | TOKAIDO | Earthquake | 0.2 m | 30 | 89 km |
| 1990 | JAPAN | Earthquake | 0.2 m | - | 139 km |
| 2000 | HONSHU: S COAST | Earthquake | 0.1 m | - | 146 km |
| 2000 | KOZU-SHIMA ISLAND, HONSHU | Earthquake | 0.1 m | 1 | 139 km |
| 1857 | TOKAIDO | Earthquake | - | - | 53 km |
| 1708 | TOKAIDO | Earthquake | - | - | 103 km |
| 1666 | AICHI PREFECTURE | Earthquake | - | - | 92 km |
| 1633 | SAGAMI BAY | Earthquake | - | 150 | 145 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Fujisan (117 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Fujisan | Stratovolcano | 3,776 m (12,388 ft) | 1708 | 117 km |
| Izu-Tobu | Pyroclastic cone(s) | 1,406 m (4,613 ft) | 1989 | 127 km |
| Hakoneyama | Complex | 1,438 m (4,718 ft) | 2015 | 132 km |
| Ontakesan | Complex | 3,067 m (10,062 ft) | 2014 | 135 km |
| Kozushima | Lava dome(s) | 572 m (1,877 ft) | 838 | 141 km |
| Toshima | Stratovolcano | 508 m (1,667 ft) | -4550 | 143 km |
| Niijima | Lava dome(s) | 432 m (1,417 ft) | 886 | 145 km |
| Izu-Oshima | Stratovolcano | 758 m (2,487 ft) | 1990 | 152 km |
| Norikuradake | Stratovolcano(es) | 3,026 m (9,928 ft) | -50 | 157 km |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 163 km |
| Yakedake | Stratovolcano(es) | 2,455 m (8,054 ft) | 1995 | 170 km |
| Miyakejima | Stratovolcano | 775 m (2,543 ft) | 2010 | 178 km |
| Hakusan | Stratovolcano | 2,702 m (8,865 ft) | 1659 | 184 km |
| Washiba-Kumonotaira | Shield(s) | 2,924 m (9,593 ft) | Unknown | 190 km |
| Mikurajima | Stratovolcano | 851 m (2,792 ft) | -4100 | 195 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (6°C) | 2.6 in | Coldest, Driest |
| February | 43°F (6°C) | 3.4 in | |
| March | 49°F (9°C) | 5.9 in | |
| April | 58°F (15°C) | 7.6 in | |
| May | 65°F (19°C) | 8.3 in | |
| June | 72°F (22°C) | 10.9 in | Wettest |
| July | 78°F (26°C) | 9.2 in | |
| August | 80°F (27°C) | 8.6 in | Warmest |
| September | 75°F (24°C) | 8.5 in | |
| October | 65°F (19°C) | 7.3 in | |
| November | 56°F (13°C) | 4.5 in | |
| December | 46°F (8°C) | 2.7 in |
Hamamatsu has a seasonal temperature swing of 38°F / from 42°F in January to 80°F in August. Total annual precipitation is 79.6 inches, with June being the wettest month (10.9") and January the driest (2.6").