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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.
For London, Ontario, the live forecast above breaks down the hour-by-hour changes through today, tracking temperature trends, wind shifts, and precipitation timing as a spring system moves across Middlesex County.
What drives London’s hourly changes?
The hourly weather for London Ontario reflects the region’s position between Lake Huron and Lake Erie, where lake breezes and passing fronts can flip conditions quickly. In the live forecast above, you’ll see how cloud cover and wind direction evolve, often shifting from morning fog to afternoon sunshine—or triggering a quick shower. The Canada weather hub offers a national view of similar patterns.
How to use the hourly data for your day?
Check the live forecast above for the next few hours to decide when to walk, run errands, or garden. The 7‑day outlook—our weather london ontario 7 days page—complements this granular data by showing long‑range trends. For regional context, the Toronto weather page illustrates how lake‑effect systems often track eastward.
How often is the hourly data updated?
Environment and Climate Change Canada issues new hourly observations every hour, while forecast models refresh four times daily. The live forecast above pulls the latest available data.
What does POP mean in the hourly forecast?
POP stands for Probability of Precipitation—a percentage chance that measurable rain (≥0.2 mm) will fall in that hour. It does not indicate duration or intensity.
Can hourly forecasts change quickly?
Yes. London’s position between the Great Lakes means local convection and lake breezes can alter conditions within minutes. Always check the live forecast above before heading out.