Climate almanac
Ontario
California, United States · 34.06°, -117.65°
What is the weather like in Ontario in August?
In August, Ontario is typically 89°F (31°C) during the day and 67°F (19°C) at night. The month brings about 0.4 in (10 mm) of precipitation in total.
- Average high89°F (31°C)
- Average low67°F (19°C)
- Precipitation0.4 in (10 mm)
- Clear or mostly clear days28
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)