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Weather & Climate in Sai, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sai experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 26°F in January while summers reach 66°F in July. The area gets 242 sunny days per year, above the national average. Annual precipitation totals 51.7 inches (wetter than the 38-inch national average). The area receives 13.6 inches of snow annually. The city sits at an elevation of 72 feet.
Temperature
26°F Jan (-3°C)
66°F Jul (19°C)
| Annual Average | 46.8°F |
| 13% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 242 days/yr |
Geography
| Elevation | 72 ft (22 m) |
| Area | 129.3 sq mi (334.9 km²) |
| Population Density | 15/sq mi |
| Coordinates | 41.4302°N, 140.8643°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
894 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.5.
| Aug 7, 1993 | 69 km WNW of Kamiiso, Japan | M6.5 | 105 km | 14 km |
| Aug 13, 2001 | 87 km ENE of Misawa, Japan | M6.4 | 128 km | 38 km |
| Jan 24, 2018 | 99 km ENE of Misawa, Japan | M6.3 | 136 km | 31 km |
| Jul 12, 1992 | 70 km ENE of Mutsu, Japan | M6.2 | 97 km | 64 km |
| Jun 11, 2023 | 20 km WSW of Biratori, Japan | M6.2 | 149 km | 121 km |
| Aug 24, 1992 | 9 km NNW of Honch?, Japan | M6.2 | 63 km | 121 km |
| Jun 8, 2015 | 74 km ENE of Mutsu, Japan | M6.1 | 98 km | 42 km |
| Aug 10, 2014 | 78 km E of Mutsu, Japan | M6.1 | 110 km | 41 km |
| Oct 14, 2002 | 87 km E of Mutsu, Japan | M6.1 | 119 km | 61 km |
| May 5, 2023 | 68 km ENE of Mutsu, Japan | M5.9 | 94 km | 59 km |
| May 23, 2012 | 72 km E of Mutsu, Japan | M5.9 | 102 km | 46 km |
| Jan 30, 1998 | 70 km ENE of Mutsu, Japan | M5.8 | 97 km | 33 km |
| Apr 29, 2008 | 70 km ENE of Mutsu, Japan | M5.8 | 97 km | 47 km |
| Sep 13, 2010 | 68 km ENE of Mutsu, Japan | M5.8 | 94 km | 45 km |
| Mar 11, 2011 | 18 km E of Misawa, Japan | M5.8 | 105 km | 45 km |
| Feb 26, 2005 | 78 km ENE of Hachinohe, Japan | M5.7 | 149 km | 68 km |
| Mar 7, 2017 | 62 km ENE of Mutsu, Japan | M5.7 | 87 km | 56 km |
| Apr 3, 2002 | 60 km ENE of Mutsu, Japan | M5.7 | 83 km | 71 km |
| Feb 6, 1995 | 80 km E of Mutsu, Japan | M5.7 | 112 km | 61 km |
| Jul 26, 1999 | 26 km ENE of Misawa, Japan | M5.7 | 99 km | 104 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
3 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 2002 | Higos | Category 1 | 69 mph | 113 km |
| 1998 | Vicki | Category 1 | 58 mph | 157 km |
| 1995 | Ryan | Category 1 | 40 mph | 295 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
15 tsunamis recorded within 500 km. Highest wave on record: 90.0 m (295 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1741 | W. HOKKAIDO ISLAND | Explosion | 90.0 m | 2,000 | 125 km |
| 1640 | SE. HOKKAIDO ISLAND | Explosion | 8.0 m | 700 | 73 km |
| 1763 | SANRIKU | Earthquake | 5.0 m | - | 118 km |
| 1793 | W. OFF AOMORI | Earthquake | 1.8 m | 12 | 100 km |
| 1982 | HOKKAIDO ISLAND | Earthquake | 1.3 m | 110 | 148 km |
| 1983 | N. HONSHU ISLAND | Earthquake | 1.0 m | - | 148 km |
| 2025 | OFF NORTHEAST COAST HONSHU | Earthquake | 0.7 m | - | 119 km |
| 1912 | SANRIKU | Earthquake | 0.5 m | - | 141 km |
| 1945 | SANRIKU | Earthquake | 0.4 m | 2 | 119 km |
| 1931 | SANRIKU | Earthquake | 0.4 m | - | 139 km |
| 1993 | JAPAN | Earthquake | 0.2 m | - | 105 km |
| 1766 | SANRIKU | Earthquake | - | 1,700 | 61 km |
| 1763 | SANRIKU, HACHIONHE | Earthquake | - | - | 125 km |
| 1763 | N. SANRIKU | Earthquake | - | - | 145 km |
| 1341 | JUSANKO, TSUGARU AOMORI PREFECTURE | Earthquake | - | 2,600 | 124 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Osorezan (27 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Osorezan | Stratovolcano | 878 m (2,881 ft) | 1787 | 27 km |
| Esan | Lava dome(s) | 618 m (2,028 ft) | 1874 | 49 km |
| Hokkaido-Komagatake | Stratovolcano | 1,131 m (3,711 ft) | 2000 | 72 km |
| Hakkodasan | Stratovolcano(es) | 1,585 m (5,200 ft) | 1550 | 86 km |
| Iwakisan | Stratovolcano | 1,625 m (5,331 ft) | 1863 | 98 km |
| Towada | Caldera | 1,011 m (3,317 ft) | 915 | 102 km |
| Kuttara | Stratovolcano(es) | 549 m (1,801 ft) | 1820 | 121 km |
| Toya | Stratovolcano | 733 m (2,405 ft) | 2001 | 124 km |
| Oshima-Oshima | Stratovolcano | 732 m (2,402 ft) | 1790 | 125 km |
| Shikotsu | Caldera | 1,320 m (4,331 ft) | 1979 | 146 km |
| Yoteizan | Stratovolcano | 1,888 m (6,194 ft) | -1050 | 155 km |
| Niseko | Stratovolcano(es) | 1,308 m (4,291 ft) | -4900 | 162 km |
| Akita-Yakeyama | Stratovolcano | 1,366 m (4,482 ft) | 1997 | 163 km |
| Hachimantai | Stratovolcano | 1,613 m (5,292 ft) | -5350 | 164 km |
| Iwatesan | Complex | 2,038 m (6,686 ft) | 1919 | 176 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 3.7 in | Coldest |
| February | 27°F (-3°C) | 3.1 in | |
| March | 32°F (0°C) | 3.0 in | Driest |
| April | 43°F (6°C) | 3.4 in | |
| May | 52°F (11°C) | 3.5 in | |
| June | 58°F (15°C) | 3.9 in | |
| July | 66°F (19°C) | 5.3 in | |
| August | 70°F (21°C) | 6.2 in | Warmest |
| September | 63°F (17°C) | 6.7 in | Wettest |
| October | 52°F (11°C) | 4.5 in | |
| November | 41°F (5°C) | 4.6 in | |
| December | 31°F (-0°C) | 3.8 in |
Sai has a seasonal temperature swing of 43°F / from 26°F in January to 70°F in August. Total annual precipitation is 51.7 inches, with September being the wettest month (6.7") and March the driest (3.0").