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Weather & Climate in Sasayama, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sasayama enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 36°F in January while summers reach 76°F in July. The area gets 222 sunny days per year, above the national average. Annual precipitation totals 62.7 inches (wetter than the 38-inch national average). The city sits at an elevation of 663 feet.
Temperature
36°F Jan (2°C)
76°F Jul (24°C)
| Annual Average | 55.6°F |
| 3% above US avg | |
| January Average | 36°F (2°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 222 days/yr |
Geography
| Elevation | 663 ft (202 m) |
| Area | 195.9 sq mi (507.3 km²) |
| Population Density | 204/sq mi |
| Coordinates | 35.0667°N, 135.2167°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
299 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.9.
| Jan 16, 1995 | 8 km S of Akashi, Japan | M6.9 | 57 km | 22 km |
| Apr 11, 1990 | 11 km ENE of Maizuru, Japan | M6.1 | 50 km | 362 km |
| Jun 1, 1998 | 17 km SW of Owase, Japan | M5.8 | 148 km | 399 km |
| Apr 12, 2013 | 6 km WNW of Sumoto, Japan | M5.8 | 85 km | 14 km |
| Aug 7, 1992 | 21 km N of Miyazu, Japan | M5.8 | 74 km | 358 km |
| Aug 20, 1999 | 22 km SE of Kainan, Japan | M5.7 | 117 km | 66 km |
| Jun 17, 2018 | near the south coast of western Honshu, Japan | M5.5 | 47 km | 10 km |
| Oct 30, 2000 | western Honshu, Japan | M5.5 | 125 km | 35 km |
| Apr 21, 2000 | 27 km NNE of Maizuru, Japan | M5.5 | 71 km | 347 km |
| Sep 24, 2003 | 5 km WNW of Ayabe, Japan | M5.4 | 28 km | 372 km |
| Sep 16, 2002 | 24 km SW of Kurayoshi, Japan | M5.3 | 144 km | 10 km |
| Jan 11, 2001 | 15 km E of Tottori, Japan | M5.3 | 87 km | 33 km |
| Mar 13, 2019 | 22 km ESE of Anan, Japan | M5.2 | 143 km | 37 km |
| Apr 22, 1998 | 18 km SE of Hikone, Japan | M5.2 | 110 km | 33 km |
| Jan 30, 1996 | 67 km NNE of Miyazu, Japan | M5.2 | 119 km | 361 km |
| Apr 15, 2007 | 11 km ENE of Ueno-ebisumachi, Japan | M5.1 | 98 km | 16 km |
| May 28, 1994 | 12 km WNW of Nagahama, Japan | M5.1 | 92 km | 49 km |
| Mar 16, 1999 | 10 km WNW of Kitahama, Japan | M5.1 | 57 km | 33 km |
| Jun 10, 2009 | 7 km WSW of Ise, Japan | M5.1 | 146 km | 352 km |
| Jan 16, 1995 | 20 km SW of Akashi, Japan | M5.0 | 68 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
48 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2023 | Lan | Category 2 | 75 mph | 158 km |
| 2018 | Jebi | Category 3 | 98 mph | 59 km |
| 2018 | Trami | Category 1 | 92 mph | 143 km |
| 2018 | Cimaron | Category 1 | 86 mph | 70 km |
| 2018 | Jongdari | Category 1 | 81 mph | 183 km |
| 2017 | Lan | Category 1 | 98 mph | 260 km |
| 2017 | Noru | Category 1 | 69 mph | 119 km |
| 2016 | Malakas | Category 1 | 81 mph | 298 km |
| 2015 | Nangka | Category 1 | 81 mph | 245 km |
| 2014 | Phanfone | Category 1 | 86 mph | 188 km |
| 2014 | Halong | Category 1 | 81 mph | 290 km |
| 2012 | Jelawat | Category 1 | 92 mph | 276 km |
| 2011 | Roke | Category 3 | 98 mph | 195 km |
| 2011 | Ma-on | Category 1 | 86 mph | 173 km |
| 2009 | Melor | Category 1 | 86 mph | 174 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 225 km |
| 2007 | Usagi | Category 1 | 52 mph | 297 km |
| 2005 | Mawar | Category 2 | 86 mph | 294 km |
| 2004 | Ma-on | Category 4 | 92 mph | 288 km |
| 2004 | Songda | Category 2 | 86 mph | 236 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
11 tsunamis recorded within 500 km. Highest wave on record: 11.3 m (37 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1927 | SW. HONSHU ISLAND | Eruption + Earthquake | 11.3 m | 3,022 | 60 km |
| 1711 | SEIONAIKAI, JAPAN | Earthquake | 2.0 m | 1,000 | 140 km |
| 1510 | OSAKA BAY | Earthquake | 2.0 m | — | 55 km |
| 1909 | ANEGAWA, JAPAN | Earthquake | 1.8 m | 41 | 105 km |
| 1808 | E. AWA, TOKUSHIMA PREFECTURE | Earthquake | 1.5 m | — | 135 km |
| 1995 | KOBE, JAPAN | Earthquake | 0.3 m | 6,434 | 55 km |
| 1791 | OASAKA BAY | Earthquake | — | — | 65 km |
| 1666 | AICHI PREFECTURE | Earthquake | — | — | 144 km |
| 1586 | ISE BAY | Earthquake | — | 8,000 | 144 km |
| 745 | OSAKA BAY, JAPAN | Earthquake | — | — | 52 km |
| 701 | SEA OF JAPAN | Earthquake | — | — | 72 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: Hakusan (185 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Hakusan | Stratovolcano | 2,702 m (8,865 ft) | 1659 | 185 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 36°F (2°C) | 3.2 in | Coldest |
| February | 36°F (2°C) | 3.5 in | |
| March | 42°F (5°C) | 4.5 in | |
| April | 53°F (11°C) | 5.4 in | |
| May | 61°F (16°C) | 5.8 in | |
| June | 68°F (20°C) | 8.4 in | Wettest |
| July | 76°F (24°C) | 7.6 in | |
| August | 78°F (25°C) | 5.2 in | Warmest |
| September | 70°F (21°C) | 8.1 in | |
| October | 59°F (15°C) | 4.8 in | |
| November | 49°F (10°C) | 3.5 in | |
| December | 40°F (5°C) | 2.7 in | Driest |
Sasayama has a seasonal temperature swing of 42°F / from 36°F in January to 78°F in August. Total annual precipitation is 62.7 inches, with June being the wettest month (8.4") and December the driest (2.7").