Climate almanac
Ontario
California, United States · 34.06°, -117.65°
What is the weather like in Ontario in May?
In May, Ontario is typically 74°F (23°C) during the day and 55°F (13°C) at night. The month brings about 0.5 in (13 mm) of precipitation in total.
- Average high74°F (23°C)
- Average low55°F (13°C)
- Precipitation0.5 in (13 mm)
- Clear or mostly clear days17
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)