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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Scene Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
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Ottawa weather is defined by cold, snowy winters and warm, humid summers, with the live forecast above showing today’s conditions. Spring and fall offer the most comfortable travel windows, though each season brings distinct packing needs and activities.
What is the best time to visit Ottawa for pleasant weather?
Late May through early October delivers the most reliable warmth, with July highs averaging 26–27°C. For snowbirds and March-break travellers, late March can still bring snow and freezing rain, while April often sees muddy thaw. Autumn foliage peaks in late September to mid-October, offering crisp, sunny days ideal for walking the Rideau Canal or Parliament Hill.
What should I pack for Ottawa’s climate?
Winter (December–February) demands a heavy parka, insulated boots, gloves and a toque, as temperatures often drop below -15°C. Summer requires light layers, rain gear and sunscreen for humid afternoons. Shoulder-season visitors should pack a waterproof jacket and sweaters; the Canada weather hub can help you check ottawa weather 7 days before departure.
Does Ottawa get extreme heat or cold?
Yes. Winter wind chills can reach -35°C, while summer humidex values occasionally exceed 40°C. Check ottawa weather hourly updates and weather warnings for sudden shifts.
How accurate are 14-day forecasts for Ottawa?
Reliability drops after 7 days. Use ottawa weather 14 day outlooks for trend awareness, but rely on ottawa weather tomorrow and weather in ottawa 10 days for trip planning.
Where can I see live Ottawa radar?
Environment Canada’s ottawa weather radar is the most accurate for real-time precipitation tracking. The ottawa weather 30 days outlook is best for long-range seasonal trends.