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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Perspective 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 residents should plan for a shift in conditions as the live forecast above shows the day’s high followed by cooler air moving in overnight. Lake Ontario’s proximity will moderate temperatures along the river, while inland neighbourhoods may see a sharper drop before dawn.
What is driving today’s weather pattern?
A broad ridge of high pressure that brought mild air yesterday is giving way to a trough sliding south from the Ottawa Valley. This boundary will increase cloud cover through the afternoon and introduce a chance of light showers by evening. Winds are expected to turn northerly after midnight, ushering in a noticeably cooler air mass for tomorrow morning. Those checking weather in Ottawa 10 days will see this pattern breaking down by mid-week as a more westerly flow returns.
How will conditions affect your plans?
The transition means the evening commute should be dry, but if you’re heading out late, keep a light jacket handy—temperatures will fall steadily after sunset. Tomorrow starts with a crisp feel, especially in low-lying areas near the Rideau Canal. If you’re comparing weather in Ottawa tomorrow to the live forecast above, expect afternoon highs to settle a few degrees lower. The Ottawa weather 30 day outlook suggests this cool snap will be brief, with seasonable warmth returning by Thursday.
Is there a weather warning for Ottawa today?
No watches or warnings are currently in effect for the Ottawa area. The weather warning page is updated whenever Environment Canada issues a statement, so check that link if conditions change.
Where can I see weather yesterday Ottawa data?
Historical observations for Ottawa are available through Environment Canada’s climate archive. The Canada weather hub provides links to daily records, including high, low and precipitation totals for the previous day.
How accurate is the ottawa weather 14 day forecast?
Seven- to 14-day outlooks show general trends rather than exact highs and lows. For the most reliable planning, use the live forecast above alongside the ottawa weather hourly breakdown, which updates several times a day.