Iwanai, Japan
Hokkaido · Japan
Iwanai is a small city in Hokkaido, Japan with a population of 13,210. Elevation: 20 ft (6 m). Average temperature: 43°F (6°C).
Population source: Wikidata (dated census and official estimates), GeoNames. Climate: WorldClim 2.1 normals (1970-2000), NASA POWER. Updated August 2026
Discover Iwanai, Japan
Explore over 40 sections covering people, economy, housing, health, crime, climate, community, costs, trends, schools, colleges, hospitals, treatment centers, industries, museums, libraries, breweries, farmers markets, grocery stores, pharmacies, campgrounds, parks, trails, stadiums, ski resorts, daycare centers, nursing homes, churches, fire stations, cell towers, bridges, power plants, EV stations, prisons, radio stations, airports, police stations, post offices, Amtrak stations, superfund sites, UNESCO sites, and more.
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People
Climate
| Population | 13,210 |
| Population Density | 104 / sq mi |
| Elevation | 20 ft (6 m) |
| Coordinates | 42.9744°, 140.5089° |
| Timezone | Asia/Tokyo |
| Country | 🇯🇵 Japan |
| State / Province | Hokkaido |
| Average Temperature | 43°F (6°C) |
| January Average | 20°F (-7°C) |
| July Average | 66°F (19°C) |
| Annual Precipitation | 55.6 inches (1,413 mm) |
| Annual Snowfall | 19.1 inches (49 cm) |
About Iwanai
Iwanai is a small city in Japan (Hokkaido) with a population of 13,210. The city sits at an elevation of 20 feet (6 meters) above sea level. The average annual temperature is 43°F (6°C). Temperatures range from 20°F in January to 66°F in July. Annual precipitation averages 55.6 inches. The timezone is Asia/Tokyo.
Climate in Iwanai
Iwanai has an average annual temperature of 8.9°C (48°F). The hottest month is Aug (21.5°C), the coldest is Jan (-2.4°C). Average annual precipitation is 1263 mm.
Temperature
| Annual Average | 43.2°F |
| 20% below Japan avg | |
| January Average | 20°F (-7°C) |
| July Average | 66°F (19°C) |
Geography
| Elevation | 20 ft (6 m) |
| Area | 126.6 sq mi (327.8 km²) |
| Population Density | 104/sq mi |
| Coordinates | 42.9744°N, 140.5089°E |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Tsunami History
6 tsunamis recorded within 500 km. Highest wave on record: 32.0 m (105 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1993 | SEA OF JAPAN | Earthquake | 32.0 m | 231 | 108 km |
| 1640 | SE. HOKKAIDO ISLAND | Explosion | 8.0 m | 700 | 102 km |
| 1947 | W. HOKKAIDO ISLAND | Earthquake | 2.0 m | - | 100 km |
| 1993 | JAPAN | Earthquake | 0.2 m | - | 123 km |
| 1834 | W. HOKKAIDO ISLAND | Earthquake | - | - | 81 km |
| 1792 | W. HOKKAIDO ISLAND | Earthquake | - | - | 59 km |
Nearby Volcanoes
10 volcanoes within 200 km. Closest: Niseko (17 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Niseko | Stratovolcano(es) | 1,308 m (4,291 ft) | -4900 | 17 km |
| Yoteizan | Stratovolcano | 1,888 m (6,194 ft) | -1050 | 30 km |
| Toya | Stratovolcano | 733 m (2,405 ft) | 2001 | 55 km |
| Kuttara | Stratovolcano(es) | 549 m (1,801 ft) | 1820 | 76 km |
| Shikotsu | Caldera | 1,320 m (4,331 ft) | 1979 | 78 km |
| Hokkaido-Komagatake | Stratovolcano | 1,131 m (3,711 ft) | 2000 | 102 km |
| Esan | Lava dome(s) | 618 m (2,028 ft) | 1874 | 141 km |
| Tokachidake | Stratovolcano(es) | 2,077 m (6,814 ft) | 2004 | 183 km |
| Oshima-Oshima | Stratovolcano | 732 m (2,402 ft) | 1790 | 188 km |
| Osorezan | Stratovolcano | 878 m (2,881 ft) | 1787 | 195 km |
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 5.8 in | Coldest |
| February | 21°F (-6°C) | 4.3 in | |
| March | 28°F (-2°C) | 3.3 in | |
| April | 39°F (4°C) | 3.0 in | Driest |
| May | 49°F (10°C) | 3.0 in | |
| June | 57°F (14°C) | 3.2 in | |
| July | 66°F (19°C) | 4.5 in | |
| August | 68°F (20°C) | 6.0 in | Warmest, Wettest |
| September | 60°F (15°C) | 6.0 in | |
| October | 48°F (9°C) | 5.1 in | |
| November | 37°F (3°C) | 5.8 in | |
| December | 26°F (-3°C) | 5.8 in |
Iwanai has a seasonal temperature swing of 47°F / from 20°F in January to 68°F in August. Total annual precipitation is 55.6 inches, with August being the wettest month (6.0") and April the driest (3.0").
Schools in Iwanai
8 public schools (OpenStreetMap data).
| School | Level | Enrollment | Teachers | Student/Teacher |
|---|---|---|---|---|
| 町立岩内第二中学校 | - | - | - | - |
| 町立岩内西小学校 | - | - | - | - |
| 町立岩内東小学校 | - | - | - | - |
| 町立西陵小学校 | - | - | - | - |
| 町立北辰小学校 | - | - | - | - |
| 北海道共和高等学校 | - | - | - | - |
| 町立岩内第一中学校 | - | - | - | - |
| 北海道岩内高等学校 | - | - | - | - |
Radio Stations near Iwanai
0 stations within ~55 km.
| Station | Genre | Quality |
|---|
Museums in Iwanai
| Name | Type | Address | Phone | Annual Revenue |
|---|---|---|---|---|
| 共和町かかし古里感 | ||||
| 原子力PRセンターとまりん館 | ||||
| 有島記念館 | ||||
| 木田金次郎美術館 | ||||
| 荒井記念美術館 | ||||
| 西村計雄記念美術館 |
Libraries in Iwanai
| Name | Address | Staff | Annual Visits | Circulation | Collection | Programs |
|---|---|---|---|---|---|---|
| ニセコ町学習交流センタ－ 「あそぶっく」 | 0.0 |
Hotels in Iwanai
6 hotels within city radius - OpenStreetMap data
Restaurants in Iwanai
16 restaurants within city radius - OpenStreetMap data
Cafes in Iwanai
3 cafes within city radius - OpenStreetMap data
Dentists in Iwanai
1 dentists within city radius - OpenStreetMap data
Bus Stations in Iwanai
1 bus stations within city radius - OpenStreetMap data
Gas Stations in Iwanai
2 gas stations within city radius - OpenStreetMap data
Banks in Iwanai
4 banks within city radius - OpenStreetMap data
Breweries in Iwanai
| Name | Type | Address | Phone | Website |
|---|---|---|---|---|
| Niseko Brewing |
Ski Resorts Near Iwanai
21 ski resorts within range.
| Resort | Slopes (km) | Lifts | Peak (m) | Price | Season | Night | Park |
|---|---|---|---|---|---|---|---|
| Asahigaoka Ski Resort | 0.0 | - | - | $0 | - | - | - |
| Shakotan Town | 0.0 | - | - | $0 | - | - | - |
| Shiomidai Schanze Otaru Ski Jump | 0.0 | - | - | $0 | - | - | - |
| Otaru Tenguyama Ski Area | 0.0 | - | - | $0 | - | - | - |
| Snowcruse ONZE | 0.0 | - | - | $0 | - | - | - |
| Asarigawa Onsen Ski Resort | 0.0 | - | - | $0 | - | - | - |
| Consadole Niki Ski Park | 0.0 | - | - | $0 | - | - | - |
| Sapporo Teine | 0.0 | - | - | $0 | - | - | - |
| Sapporo Kokusai Skiing Resort | 0.0 | - | - | $0 | - | - | - |
| Kiroro Resort | 0.0 | - | - | $0 | - | - | - |
| Iwanai Resort | 0.0 | - | - | $0 | - | - | - |
| Muroran-shi Ski Area | 0.0 | - | - | $0 | - | - | - |
| Chisennupri | 0.0 | - | - | $0 | - | - | - |
| Niseko United | 0.0 | - | - | $0 | - | - | - |
| Niseko Moiwa Ski Resort | 0.0 | - | - | $0 | - | - | - |
| Suttsu Town Ski Area | 0.0 | - | - | $0 | - | - | - |
| Rusutsu Resort Ski Area | 0.0 | - | - | $0 | - | - | - |
| Funamidai Ski Area | 0.0 | - | - | $0 | - | - | - |
| Orofure Ski Area | 0.0 | - | - | $0 | - | - | - |
| Sanlaiva | 0.0 | - | - | $0 | - | - | - |
| Pirika Ski Resort | 0.0 | - | - | $0 | - | - | - |
Airports Near Iwanai
5 airports within the area.
| Airport | IATA | Type |
|---|---|---|
| JASDF Yakumo Airbase | - | Small Airport |
| JGSDF Camp Horobetsu Airfield | - | Small Airport |
| Otaki Airfield | - | Small Airport |
| Shiraoi Gliderport | - | Small Airport |
| Yoichi Agricultural Airfield / Appleport Yoichi | - | Small Airport |
Post Offices in Iwanai
6 post offices.
| Post Office | Address |
|---|---|
| 前田郵便局 | |
| 岩内大浜簡易郵便局 | |
| 岩内宮園簡易郵便局 | |
| 岩内東山簡易郵便局 | |
| 岩内郵便局 | |
| 島野郵便局 |
Churches & Religious Organizations in Iwanai
16 religious organizations (IRS tax-exempt data).
| Name | Address |
|---|---|
| Iwanai Konpira Shrine | |
| 伊夜日子神社 | |
| 光照寺 | |
| 全修寺 | |
| 八幡神社 | |
| 創価学会 | |
| 地蔵寺 | |
| 岩内神社 | |
| 帰厚院 | |
| 敷島内神社 | |
| 智恵光寺 | |
| 本弘寺 | |
| 蓮華寺 | |
| 野束神社 | |
| 阿弥陀寺 | |
| 鳳翔寺 |
Explore Near Iwanai
Waterfalls Near Iwanai
4 waterfalls from OpenStreetMap and USGS geographic data found near Iwanai.
| Name | Description |
|---|---|
| 梯子滝 | |
| 車滝 | |
| 雲間の滝 | |
| 鳴神の滝 |
Quick Facts
🇯🇵 About Japan
Public Holidays in Japan
16 public holidays this year
Frequently Asked Questions About Iwanai
What is the population of Iwanai?
Iwanai has a population of 13,210 residents and is located in Japan. The population density is 104 people per square mile, spread across 126.6 square miles.
What is the weather like in Iwanai?
Iwanai has a cool climate with an average annual temperature of 43°F (6°C). Winter temperatures average 20°F in January, while summers reach an average of 66°F in July. Annual rainfall totals 55.6 inches, with 19.1 inches of snow.
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