Climate almanac
Iwanai
Hokkaido, Japan · 42.97°, 140.51°
What is the weather like in Iwanai in September?
In September, Iwanai is typically 70°F (21°C) during the day and 60°F (16°C) at night. The month brings about 5.1 in (130 mm) of precipitation in total.
- Average high70°F (21°C)
- Average low60°F (16°C)
- Precipitation5.1 in (130 mm)
- Clear or mostly clear days7
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)