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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Edition Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Ottawa’s weather today, as shown in the live forecast above, brings a mix of sun and cloud with a high near 24°C. The capital is settling into a mild late-summer pattern, though humidity may nudge the humidex into the upper twenties by midday. Showers are unlikely until evening, when a cold front from the Ottawa Valley could trigger a brief thunderstorm near the Rideau Canal.
What will the temperature feel like this afternoon?
With dew points around 14°C, the air will feel comfortable for most of the morning. As the sun climbs over the Gatineau Hills, the humidex will reach about 28°C by 2 p.m. Winds from the southwest at 15 to 20 km/h will keep the urban core of Ottawa reasonably fresh, but neighbourhoods closer to the Ottawa River may notice a slight cooling breeze off the water.
Is rain expected tonight or tomorrow?
A low-pressure system tracking east of Lake Ontario will push a line of showers across the region after 9 p.m. The best chance of measurable rain arrives between 11 p.m. and 3 a.m., with totals under 5 millimetres. By tomorrow morning, skies will clear quickly, leaving a sunny start for the commute. The ottawa weather 7 days outlook shows a gradual warming trend into the weekend, with highs near 27°C by Friday.
Ottawa weather radar and longer-range view
The Canada weather hub provides live ottawa weather radar loops, showing the approaching front near Petawawa this evening. For those planning ahead, the Montreal Weather page can help track systems moving east. The ottawa weather 30 days trend indicates a typical September transition: cooler nights (8–10°C) and warm afternoons through the second week. The ottawa weather in celsius readings will stay in the low 20s for the next several days, with the 14-day forecast hinting at a possible frost risk after the 20th.
Will Ottawa see frost overnight anytime soon?
Not this week. Lows will hold near 12°C through Friday. A pattern shift around September 18 could bring the first chilly night, with lows dipping toward 5°C in rural areas like Manotick. Keep an eye on ottawa weather 14 day updates.
How accurate is the ottawa weather 7 days forecast?
Environment Canada rates the seven-day outlook as “moderate confidence” for the Ottawa region, with typical accuracy of about 75% for temperature trends. Precipitation timing becomes less reliable after day five; check the hourly updates for tomorrow’s timing.
What are the best sources for ottawa weather hourly data?
Environment and Climate Change Canada’s official site offers the most reliable hourly observations from Ottawa Airport. The live forecast above draws from that data. For mobile-friendly updates, The Weather Network’s app also gives hour-by-hour detail for your exact neighbourhood.