What is the weather like in Ottawa?
Ottawa has a humid continental climate — famous for its extremes. Summers are warm and sunny with temperatures regularly reaching 30°C, while winters are genuinely cold, with temperatures regularly falling below -20°C with wind chill. Spring and fall are beautiful but brief. If you're moving to or visiting Ottawa, understanding the seasons is essential.
Summer (June–August)
Ottawa summers are excellent. Average highs sit in the 25–30°C range through July and August. Humidity is moderate. June can still be cool in the evenings; August is peak warmth. The Rideau Canal pathway, Ottawa River beach at Westboro, and outdoor festivals make summer the city's social peak. Expect some thunderstorm activity in July and August — Ottawa gets proper summer storms.
Dress for: Light clothing, sunscreen. Pack a layer for evenings.
Fall (September–November)
Fall is arguably Ottawa's most beautiful season. September is warm and golden. October brings spectacular leaf colour along the Canal, in the Gatineau Hills, and across the city's tree-lined streets. Average highs drop from ~22°C in September to ~5°C by November. The first frost typically arrives in mid-October; the first snow can fall in November.
Dress for: Layers. Jacket weather from mid-September; winter coat by November.
Winter (December–March)
Ottawa winters are serious. Average January highs are around -8°C, with lows regularly hitting -15°C to -25°C with wind chill. Snow accumulates — Ottawa averages around 235 cm of snow per year. The Rideau Canal Skateway opens when ice reaches 30 cm thickness, usually in January, and runs through February. Winterlude celebrates rather than hides from the cold.
Ottawa winters require real winter gear: insulated parka, waterproof boots, hat, and gloves are non-negotiable. The cold is manageable and locals adapt well.
Dress for: Full winter kit — insulated coat, waterproof boots rated to -30°C, hat, gloves, neck warmer.
Spring (April–May)
Spring arrives gradually — March is still cold and often snowy. April sees the thaw, with temperatures climbing from freezing to around 15°C by month's end. May is lovely — tulips bloom, patios open, and the city comes back to life. Late spring can be rainy.
Dress for: Transitional layers. Waterproof jacket is essential for April showers.
What to Expect
| Season | Avg High | Avg Low | |---|---|---| | Winter (Jan) | -8°C | -16°C | | Spring (Apr) | 12°C | 2°C | | Summer (Jul) | 27°C | 17°C | | Fall (Oct) | 12°C | 4°C |
For seasonal events tied to the weather, see Ottawa events this weekend.
Frequently Asked Questions
How cold does Ottawa get in winter? Ottawa averages lows of -15°C to -20°C with wind chill in January. Extreme cold events push below -30°C with wind chill. It's one of Canada's coldest capital cities.
Does it snow a lot in Ottawa? Yes — Ottawa averages around 235 cm (about 7.7 feet) of snow per year. Heavy snowfalls are common from December through March.
What is the best time of year to visit Ottawa? May (Tulip Festival), June–July (festivals and warm weather), and September–October (fall colours) are the most popular times. Winter visits around Winterlude in February are also popular.
Does Ottawa get very hot in summer? Yes — Ottawa experiences real summer heat. July and August regularly see highs of 28–32°C with humidity. The odd heat wave can push into the mid-30s.
