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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Civic Maple Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Check the live forecast above before heading out. London, Ontario, sits in a humid continental zone, so expect four distinct seasons with rapid weather shifts, especially in spring and fall.
What is the typical weather near London, Ontario?
London’s climate brings warm, humid summers and cold, snowy winters. Average July highs reach 26°C, while January lows often drop to -9°C. The region gets about 1,000 millimetres of precipitation annually, with snowfall averaging around 200 centimetres. Lake Huron and Lake Erie moderate temperatures slightly, but lake-effect snow can hit areas south and west of the city.
How does lake-effect snow affect London?
Cold winds crossing the warmer Great Lakes pick up moisture and dump snow downwind. London is far enough inland to avoid the heaviest bands, but areas like Strathroy and Komoka can see sudden, intense squalls. Check the 10-day forecast for alerts during winter months.
When is the best time to visit London, Ontario?
Late May through early October offers the most reliable weather. Summer days are warm but not extreme, and fall colours peak in late September. Winter can be harsh for outdoor plans.
Does London get tornadoes?
Yes, but rarely. Southwestern Ontario sits in a severe-weather corridor. Tornadoes are possible from June to August, usually weak and short-lived. Always monitor Environment Canada warnings during storms.
How accurate are 7-day forecasts for London?
Reasonably accurate for temperature trends, but precipitation timing can shift. Day 5 to 7 outlooks have a margin of error of about 2–3°C. For precise planning, rely on the 24-hour forecast above.
Sources
For broader conditions across the province, see the Canada weather hub or check Toronto weather for comparison.