Home › Weather › London Ontario Weather
Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Scope Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Check the live forecast above for today’s conditions, then plan your day around the chance of rain or snow. London Ontario’s weather is shaped by its inland location in Southwestern Ontario, bringing humid summers and cold, snowy winters.
What makes London Ontario’s weather different from other parts of the province?
London sits in a transition zone between the Great Lakes’ moderating influence and the continental air masses that sweep down from the north. This means you can expect more variable cloud cover and precipitation than areas closer to Lake Huron or Lake Erie. The city also lies in the “snowbelt” corridor east of Lake Huron, which can bring heavy lake-effect snow squalls during late autumn and early winter.
How reliable are 15-day forecasts for London?
Environment and Climate Change Canada issues reliable outlooks up to about seven days. Forecasts beyond that, such as a London Ontario weather 15 days outlook, are best used as a general trend rather than a precise prediction. Day-to-day accuracy drops significantly after the first week because small changes in storm tracks or lake-effect bands are hard to pin down that far ahead.
When does London usually see its first snowfall?
First measurable snow (≥0.2 cm) typically arrives in late November, but flurries can occur as early as mid-October. The first accumulating snow of the season often comes with a lake-effect event off Lake Huron.
Does London get tornadoes?
Yes, though they are rare. Southwestern Ontario, including London, lies in a region that can see weak tornadoes during severe spring and summer thunderstorms. The risk is highest from June through August.
Where can I find the latest London Ontario news about weather warnings?
For real-time alerts, check our Weather Warning page or the Environment Canada alerts page. Local London Ontario news outlets also broadcast watches and warnings as they are issued.