Home › Weather › Weather London Ontario Canada
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.
London Ontario sits in southwestern Ontario’s Thames River valley, with a humid continental climate shaped by its inland position and proximity to Lake Erie. The live forecast above shows the current conditions for Canada’s tenth-largest city, where temperatures shift noticeably between seasons.
What is the weather like in London Ontario today?
Based on the live forecast above, Londoners can expect a typical mix of cloud and sun with temperatures near the seasonal average. Southwestern Ontario’s weather often arrives from the American Midwest, bringing quick changes—especially in spring and fall. The city’s location between Lake Huron and Lake Erie means lake-breeze fronts can alter afternoon conditions within minutes. Check the live forecast for precise hourly details, including wind direction off the lakes.
How does Lake Erie affect London’s weather?
Lake Erie, about 50 kilometres south, moderates London’s climate by keeping winters slightly milder than inland communities. In late autumn and early winter, the lake’s open water can trigger lake-effect snow bands that drift north into the city, occasionally dumping 10 to 20 centimetres in a single event. During summer, a southwesterly flow off the lake can lower afternoon highs by 2–3 degrees Celsius compared to areas farther north. This lake influence is a key reason London’s weather often differs from Toronto’s or Ottawa’s.
When is the best time to visit London Ontario for weather?
Late May through September offers the most comfortable conditions, with daytime highs between 22°C and 28°C. July is the warmest month, but humidity can push humidex values above 35°C on some afternoons.
Does London get a lot of snow?
London averages about 200 centimetres of snow each winter, higher than many southern Ontario cities because of lake-effect squalls from Lake Huron and Lake Erie. January is the snowiest month, with frequent accumulations of 5–10 cm per event.
How humid is London in summer?
Summer humidity is moderate to high, with dew points often in the 15°C–20°C range. July and August afternoons can feel muggy, especially after thunderstorms roll through. This is typical for the region and is a factor in local london ontario news heat advisories.