Climate almanac
Ontario
California, US · 34.06°, -117.65°
What is the climate like in Ontario?
The best time to visit Ontario is typically April – November, with trip comfort peaking in July (9.3/10). Ontario is warmest in August, when daily highs average 89°F (31°C), and coolest in January, when lows fall to about 45°F (7°C). The wettest month is typically January and the driest is July; the year sees roughly 18 in of precipitation.
- Best time to visitApril – November — comfort peaks in July (9.3/10)
- Warmest monthAugust — average high 89°F (31°C)
- Coolest monthJanuary — average low 45°F (7°C)
- Wettest monthJanuary (3.7 in)
- Driest monthJuly (0.0 in)
- Annual precipitation18 in