Climate almanac
Johnston
Iowa, United States · 41.67°, -93.70°
What is the weather like in Johnston in August?
In August, Johnston is typically 84°F (29°C) during the day and 65°F (18°C) at night. The month brings about 3.4 in (86 mm) of precipitation in total.
- Average high84°F (29°C)
- Average low65°F (18°C)
- Precipitation3.4 in (86 mm)
- Clear or mostly clear days14
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)