Iwanai

What is the climate like in Iwanai?

The best time to visit Iwanai is typically September, the year's most comfortable month (6.3/10). Iwanai is warmest in August, when daily highs average 76°F (24°C), and coolest in January, when lows fall to about 22°F (-6°C). The wettest month is typically August and the driest is April; the year sees roughly 60 in (1522 mm) of precipitation.

• Best time to visitSeptember — the year's comfort peak (6.3/10)
• Warmest monthAugust — average high 76°F (24°C)
• Coolest monthJanuary — average low 22°F (-6°C)
• Wettest monthAugust (7.4 in (188 mm))
• Driest monthApril (3.2 in (80 mm))
• Annual precipitation60 in (1522 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromKutchan, 21 km away (1951-2026)