Iwanai, Hokkaido Climate
Japan
Pop. 13,210 Elev. 6 m / 20 ft
TZ: Asia/Tokyo (UTC+9) ·
Summers in Iwanai are mild, with July highs around 80°F (27°C), while winters are cold with January lows of 25°F (-4°C). Wind chill can push winter lows to 17°F (-8°C). Expect around 63 rainy days annually (44.1 in / 1121 mm total), with snow on 43 days and 206 in (5226 mm) of annual accumulation. The city averages 47 sunny days per year and around 52 thunderstorm days. Ocean water temperatures reach 78°F (26°C) in summer.
| Temperature | 27°C (80°F) high | -4°C (25°F) low |
| Feels like | -8°C (17°F) low | |
| Rain | 63 days | 1121 mm (44.1 in) /yr |
| Snow | 43 days | 5226 mm (205.8 in) /yr |
| Sky | 47 sunny | 52 stormy |
| Wind | 1.7 m/s (3.9 mph) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: May, Jun, Jul
Sky & Air by Month
Cloud cover (%)
64
Jan 65
Feb 72
Mar 72
Apr 61
May 64
Jun 64
Jul 68
Aug 60
Sep 67
Oct 66
Nov 79
Dec Humidity (%)
80
Jan 76
Feb 74
Mar 81
Apr 75
May 81
Jun 83
Jul 85
Aug 79
Sep 76
Oct 77
Nov 79
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 72 km Sapporo Okadama Airport (OKD)
Ski resort 3 km 岩内
National park 111 km 大沼国定公園
Mountain peak
(1,843 m) 29 km 北岳
Hospital 2 km 大浜病院
Hiking trail 27 km 倶知安コース · Kutchan trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 0°C 31°F | -4°C 25°F | 9 mm 0.4 in | 1162 mm45.8 in | 3 |
| February | 0°C 32°F | -4°C 25°F | 7 mm 0.3 in | 1405 mm55.3 in | 1 |
| March | 3°C 37°F | -1°C 30°F | 42 mm 1.7 in | 817 mm32.2 in | 2 |
| April | 9°C 48°F | 4°C 39°F | 95 mm 3.7 in | 30 mm1.2 in | 5 |
| May | 16°C 61°F | 9°C 48°F | 58 mm 2.3 in | — | 6 |
| June | 21°C 70°F | 15°C 59°F | 100 mm 3.9 in | — | 6 |
| July | 27°C 80°F | 21°C 69°F | 103 mm 4.1 in | — | 7 |
| August | 26°C 78°F | 20°C 68°F | 203 mm 8.0 in | — | 3 |
| September | 23°C 73°F | 16°C 61°F | 213 mm 8.4 in | — | 8 |
| October | 13°C 56°F | 8°C 46°F | 131 mm 5.2 in | 52 mm2.0 in | 4 |
| November | 7°C 45°F | 2°C 36°F | 111 mm 4.4 in | 425 mm16.7 in | 2 |
| December | 1°C 34°F | -4°C 25°F | 48 mm 1.9 in | 1335 mm52.5 in | 0 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 3 | 7 |
| February | 1 | 5 |
| March | 2 | 5 |
| April | 5 | 0 |
| May | 6 | 0 |
| June | 6 | 2 |
| July | 7 | 3 |
| August | 3 | 8 |
| September | 8 | 4 |
| October | 4 | 3 |
| November | 2 | 10 |
| December | 0 | 5 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 9°C 49°F | 1°C 33°F |
| February | 9°C 48°F | 1°C 33°F |
| March | 8°C 46°F | 1°C 33°F |
| April | 9°C 48°F | 2°C 36°F |
| May | 13°C 56°F | 5°C 42°F |
| June | 19°C 67°F | 11°C 52°F |
| July | 24°C 76°F | 19°C 66°F |
| August | 26°C 78°F | 23°C 73°F |
| September | 25°C 76°F | 21°C 69°F |
| October | 21°C 70°F | 15°C 59°F |
| November | 14°C 57°F | 8°C 47°F |
| December | 11°C 52°F | 4°C 40°F |