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Weather & Climate in Tosa, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Tosa enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 40°F in January while summers reach 77°F in July. The area gets 187 sunny days per year. Annual precipitation totals 82.4 inches (wetter than the 38-inch national average). The city sits at an elevation of 43 feet.
Temperature
40°F Jan (4°C)
77°F Jul (25°C)
| Annual Average | 59.1°F |
| 9% above US avg | |
| January Average | 40°F (4°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 187 days/yr |
Geography
| Elevation | 43 ft (13 m) |
| Area | 366.8 sq mi (950.1 km²) |
| Population Density | 70/sq mi |
| Coordinates | 33.5048°N, 133.4448°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
132 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.8.
| Mar 24, 2001 | 16 km SSW of Kure, Japan | M6.8 | 107 km | 50 km |
| Apr 17, 2024 | 18 km W of Uwajima, Japan | M6.3 | 104 km | 32 km |
| Mar 25, 2001 | 22 km WNW of H?j?, Japan | M5.2 | 101 km | 43 km |
| Mar 13, 2019 | 22 km ESE of Anan, Japan | M5.2 | 135 km | 37 km |
| Apr 2, 1997 | 34 km WSW of ?zu, Japan | M5.1 | 115 km | 46 km |
| Apr 26, 2007 | 15 km ESE of Niihama, Japan | M5.1 | 44 km | 50 km |
| Feb 18, 2018 | 27 km SE of Saiki, Japan | M5.0 | 145 km | 42 km |
| Aug 14, 1993 | 19 km SW of ?zu, Japan | M5.0 | 98 km | 41 km |
| Jun 20, 2017 | 15 km SE of Saiki, Japan | M5.0 | 149 km | 37 km |
| Jan 3, 1991 | 22 km W of ?zu, Japan | M5.0 | 105 km | 63 km |
| Jun 18, 2021 | 1 km ENE of ?zu, Japan | M4.9 | 82 km | 42 km |
| Jan 9, 2001 | 40 km W of ?zu, Japan | M4.9 | 123 km | 49 km |
| Aug 30, 1993 | 16 km WSW of ?zu, Japan | M4.9 | 98 km | 47 km |
| Mar 11, 2019 | 6 km SE of Kihoku-ch?, Japan | M4.9 | 74 km | 44 km |
| Jun 16, 2022 | 5 km S of Komatsushimach?, Japan | M4.9 | 115 km | 40 km |
| Mar 8, 2020 | 28 km NE of Usuki, Japan | M4.9 | 136 km | 58 km |
| Aug 22, 1994 | 39 km S of Anan, Japan | M4.9 | 107 km | 38 km |
| Feb 26, 2024 | 18 km N of Yawatahama, Japan | M4.9 | 97 km | 42 km |
| Aug 15, 2016 | 26 km ENE of Kitsuki, Japan | M4.9 | 144 km | 72 km |
| May 10, 2019 | 45 km SW of Sukumo, Japan | M4.8 | 137 km | 35 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 |
| 2023 | Lan | Category 1 | 69 mph | 210 km |
| 2022 | Nanmadol | Category 2 | 98 mph | 264 km |
| 2019 | Francisco | Category 1 | 81 mph | 238 km |
| 2018 | Jebi | Category 3 | 98 mph | 83 km |
| 2018 | Trami | Category 1 | 98 mph | 95 km |
| 2018 | Cimaron | Category 1 | 92 mph | 109 km |
| 2017 | Noru | Category 1 | 69 mph | 54 km |
| 2016 | Malakas | Category 2 | 86 mph | 79 km |
| 2015 | Goni | Category 3 | 98 mph | 276 km |
| 2015 | Nangka | Category 1 | 86 mph | 97 km |
| 2014 | Phanfone | Category 2 | 92 mph | 166 km |
| 2014 | Halong | Category 1 | 86 mph | 58 km |
| 2012 | Jelawat | Category 1 | 92 mph | 169 km |
| 2011 | Roke | Category 4 | 98 mph | 212 km |
| 2011 | Ma-on | Category 1 | 86 mph | 61 km |
| 2009 | Melor | Category 1 | 92 mph | 220 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 127 km |
| 2007 | Usagi | Category 3 | 98 mph | 189 km |
| 2007 | Man-yi | Category 2 | 86 mph | 108 km |
| 2006 | Shanshan | Category 1 | 81 mph | 287 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
6 tsunamis recorded within 500 km. Highest wave on record: 25.7 m (84 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1707 | NANKAIDO | Earthquake | 25.7 m | 5,000 | 130 km |
| 1605 | NANKAIDO | Earthquake | 10.0 m | 5,000 | 147 km |
| 684 | NANKAIDO | Earthquake | 3.0 m | - | 123 km |
| 1711 | SEIONAIKAI, JAPAN | Earthquake | 2.0 m | 1,000 | 102 km |
| 1808 | E. AWA, TOKUSHIMA PREFECTURE | Earthquake | 1.5 m | - | 133 km |
| 1899 | SEIKAIDO | Earthquake | - | - | 139 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Yufu-Tsurumi (192 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 192 km |
| Sanbesan | Stratovolcano | 1,126 m (3,694 ft) | 650 | 197 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (4°C) | 2.0 in | Coldest, Driest |
| February | 41°F (5°C) | 3.5 in | |
| March | 47°F (9°C) | 5.4 in | |
| April | 57°F (14°C) | 8.6 in | |
| May | 64°F (18°C) | 9.5 in | |
| June | 70°F (21°C) | 13.0 in | Wettest |
| July | 77°F (25°C) | 12.2 in | |
| August | 79°F (26°C) | 4.3 in | Warmest |
| September | 73°F (23°C) | 11.2 in | |
| October | 63°F (17°C) | 6.5 in | |
| November | 54°F (12°C) | 3.9 in | |
| December | 44°F (7°C) | 2.2 in |
Tosa has a seasonal temperature swing of 39°F / from 40°F in January to 79°F in August. Total annual precipitation is 82.4 inches, with June being the wettest month (13.0") and January the driest (2.0").