Ottawa

What is the climate like in Ottawa?

The best time to visit Ottawa is typically August – September, with trip comfort peaking in September (7.2/10). Ottawa is warmest in July, when daily highs average 84°F (29°C), and coolest in January, when lows fall to about 20°F (-6°C). The wettest month is typically May and the driest is November; the year sees roughly 42 in (1056 mm) of precipitation.

• Best time to visitAugust – September — comfort peaks in September (7.2/10)
• Warmest monthJuly — average high 84°F (29°C)
• Coolest monthJanuary — average low 20°F (-6°C)
• Wettest monthMay (5.0 in (127 mm))
• Driest monthNovember (2.2 in (55 mm))
• Annual precipitation42 in (1056 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromOttawa 4sw, 6 km away (1892-2026)