Home › Weather › Harriston Weather
Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the True North Brief Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above for Harriston’s current temperature and conditions; the trend over the next few hours tells you whether afternoon showers or a wind shift are on the way.
What are the key numbers for Harriston today?
Based on the live forecast above, Harriston sits in a humid continental climate zone. Daytime highs in summer typically range from 24–28 °C, while winter highs often fall between –4 and –8 °C. The prevailing westerly flow brings variable cloud and a chance of lake-effect snow from Lake Huron when winds turn northwest.
How does Harriston weather change through the week?
The harriston ontario weather 7 day outlook usually reflects a pattern of frontal passages every two to three days. Follow the hourly data in the live forecast above to spot the timing of rain or snow. For a broader view across the province, see the Canada weather hub and Toronto Weather page for comparison with southern Ontario trends.
Does Harriston get lake-effect snow?
Yes. When cold northwesterly winds sweep across Lake Huron, Harriston can receive bands of lake-effect snow. The harriston weather radar at Environment Canada shows these narrow, intense bands forming downwind of the lake.
Where can I find a reliable weather network for Harriston?
The weather network Harriston page on The Weather Network provides hourly and seven‑day forecasts. Environment and Climate Change Canada’s official site is the authoritative source for warnings and radar data.
Is harriston weather hourly data useful for planning?
Yes. The harriston weather hourly breakdown in the live forecast above shows temperature, wind, and precipitation timing hour by hour, which is essential for scheduling outdoor work or travel.