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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Toronto Post 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 temperature sits within the range shown in the live forecast above, with a humidex making it feel several degrees warmer. The afternoon high is near seasonal for early autumn, while a light northwesterly breeze keeps conditions comfortable.
What is the humidex and why does it matter?
The humidex combines temperature and humidity to reflect how hot it actually feels. In Ottawa today, the humidex is 3–5°C above the air temperature, meaning outdoor activity requires more frequent breaks and hydration. Values above 35°C trigger heat warning criteria in eastern Ontario.
Will the evening cool down?
Sunset brings a 7–9°C drop from the daytime high, with overnight lows near 10°C. Clear skies and low humidity after dark will make for a crisp, calm night. No precipitation is expected.
Is this weather typical for Ottawa in early October?
Yes. Average daytime highs for early October in Ottawa range from 13–17°C, with lows near 5–8°C. Today’s values are slightly above that normal, but within the expected variability for the season.
Should I expect any frost tonight?
No. Overnight lows near 10°C are well above the frost threshold of 0°C. Gardens and sensitive plants are not at risk tonight, though frost becomes more likely by late October.
Where can I find up-to-date warnings for Ottawa?
Environment and Climate Change Canada issues all official weather warnings. For Ottawa-specific alerts, visit our Weather Warning page or check the ECCC website directly.