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Weather & Climate in Niihama, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Niihama enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 38°F in January while summers reach 77°F in July. The area gets 202 sunny days per year. Annual precipitation totals 73.7 inches (wetter than the 38-inch national average). The city sits at an elevation of 43 feet.
Temperature
38°F Jan (3°C)
77°F Jul (25°C)
| Annual Average | 57.3°F |
| 6% above US avg | |
| January Average | 38°F (3°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 202 days/yr |
Geography
| Elevation | 43 ft (13 m) |
| Area | 90.5 sq mi (234.5 km²) |
| Population Density | 1,359/sq mi |
| Coordinates | 33.9605°N, 133.3052°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
141 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 | 73 km | 50 km |
| Mar 13, 2014 | 32 km SSW of Hikari, Japan | M6.3 | 140 km | 79 km |
| Apr 17, 2024 | 18 km W of Uwajima, Japan | M6.3 | 118 km | 32 km |
| Apr 12, 2013 | 6 km WNW of Sumoto, Japan | M5.8 | 147 km | 14 km |
| Oct 8, 2000 | 32 km N of Sh?bara, Japan | M5.4 | 134 km | 10 km |
| Sep 16, 2002 | 24 km SW of Kurayoshi, Japan | M5.3 | 148 km | 10 km |
| Sep 3, 1997 | 21 km S of Yasugich?, Japan | M5.3 | 141 km | 10 km |
| Mar 13, 2019 | 22 km ESE of Anan, Japan | M5.2 | 144 km | 37 km |
| Mar 25, 2001 | 22 km WNW of H?j?, Japan | M5.2 | 71 km | 43 km |
| Jul 17, 2021 | 29 km NE of Kitsuki, Japan | M5.2 | 142 km | 64 km |
| Apr 2, 1997 | 34 km WSW of ?zu, Japan | M5.1 | 121 km | 46 km |
| Apr 26, 2007 | 15 km ESE of Niihama, Japan | M5.1 | 15 km | 50 km |
| Aug 14, 1993 | 19 km SW of ?zu, Japan | M5.0 | 106 km | 41 km |
| Jan 3, 1991 | 22 km W of ?zu, Japan | M5.0 | 106 km | 63 km |
| Jun 3, 2011 | 9 km ENE of G?tsuch?, Japan | M5.0 | 149 km | 10 km |
| Aug 15, 2016 | 26 km ENE of Kitsuki, Japan | M4.9 | 141 km | 72 km |
| Mar 8, 2020 | 28 km NE of Usuki, Japan | M4.9 | 140 km | 58 km |
| Mar 11, 2019 | 6 km SE of Kihoku-ch?, Japan | M4.9 | 99 km | 44 km |
| Aug 30, 1993 | 16 km WSW of ?zu, Japan | M4.9 | 103 km | 47 km |
| Jan 9, 2001 | 40 km W of ?zu, Japan | M4.9 | 118 km | 49 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
52 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 | 223 km |
| 2022 | Nanmadol | Category 2 | 98 mph | 253 km |
| 2019 | Francisco | Category 1 | 81 mph | 267 km |
| 2018 | Jebi | Category 3 | 98 mph | 118 km |
| 2018 | Trami | Category 1 | 98 mph | 132 km |
| 2018 | Cimaron | Category 1 | 92 mph | 123 km |
| 2017 | Noru | Category 1 | 69 mph | 101 km |
| 2016 | Malakas | Category 1 | 86 mph | 130 km |
| 2015 | Goni | Category 3 | 98 mph | 250 km |
| 2015 | Nangka | Category 1 | 86 mph | 141 km |
| 2014 | Phanfone | Category 2 | 92 mph | 217 km |
| 2014 | Halong | Category 1 | 81 mph | 107 km |
| 2012 | Jelawat | Category 1 | 92 mph | 212 km |
| 2011 | Roke | Category 4 | 98 mph | 254 km |
| 2011 | Ma-on | Category 1 | 86 mph | 105 km |
| 2009 | Melor | Category 1 | 92 mph | 255 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 178 km |
| 2007 | Usagi | Category 3 | 98 mph | 185 km |
| 2007 | Man-yi | Category 1 | 86 mph | 148 km |
| 2006 | Shanshan | Category 1 | 81 mph | 268 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 2.0 m (7 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1711 | SEIONAIKAI, JAPAN | Earthquake | 2.0 m | 1,000 | 74 km |
| 1808 | E. AWA, TOKUSHIMA PREFECTURE | Earthquake | 1.5 m | — | 138 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
3 volcanoes within 200 km. Closest: Sanbesan (145 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Sanbesan | Stratovolcano | 1,126 m (3,694 ft) | 650 | 145 km |
| Abu | Shield(s) | 641 m (2,103 ft) | -6850 | 168 km |
| Yufu-Tsurumi | Lava dome(s) | 1,584 m (5,197 ft) | 867 | 193 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 38°F (3°C) | 2.1 in | Coldest |
| February | 39°F (4°C) | 3.0 in | |
| March | 45°F (7°C) | 4.7 in | |
| April | 55°F (13°C) | 7.2 in | |
| May | 63°F (17°C) | 7.8 in | |
| June | 69°F (21°C) | 11.9 in | Wettest |
| July | 77°F (25°C) | 10.8 in | |
| August | 78°F (26°C) | 5.6 in | Warmest |
| September | 71°F (22°C) | 9.6 in | |
| October | 61°F (16°C) | 5.7 in | |
| November | 51°F (11°C) | 3.4 in | |
| December | 42°F (6°C) | 2.1 in | Driest |
Niihama has a seasonal temperature swing of 40°F / from 38°F in January to 78°F in August. Total annual precipitation is 73.7 inches, with June being the wettest month (11.9") and December the driest (2.1").