Climate almanac
Decatur
Indiana, United States · 40.83°, -84.93°
What is the weather like in Decatur in August?
In August, Decatur is typically 82°F (28°C) during the day and 65°F (18°C) at night. The month brings about 3.5 in (88 mm) of precipitation in total.
- Average high82°F (28°C)
- Average low65°F (18°C)
- Precipitation3.5 in (88 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)