Ontario

What is the climate like in Ontario?

The best time to visit Ontario is typically April – October, with trip comfort peaking in June (8.7/10). Ontario is warmest in July, when daily highs average 99°F (37°C), and coolest in January, when lows fall to about 27°F (-3°C). The wettest month is typically December and the driest is July; the year sees roughly 11 in (285 mm) of precipitation.

• Best time to visitApril – October — comfort peaks in June (8.7/10)
• Warmest monthJuly — average high 99°F (37°C)
• Coolest monthJanuary — average low 27°F (-3°C)
• Wettest monthDecember (1.8 in (46 mm))
• Driest monthJuly (0.1 in (2 mm))
• Annual precipitation11 in (285 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromPayette, 6 km away (1892-2026)