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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Toronto Post Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
London Ont is currently experiencing conditions as shown in the live forecast above, with temperatures ranging from a low of 8°C to a high of 14°C under partly cloudy skies. This pattern reflects a mild autumn transition, with daytime highs near seasonal norms and overnight lows dropping into single digits.
What is the weather trend for London Ontario this week?
The week ahead shows a mix of sun and cloud, with daytime highs between 12°C and 16°C and overnight lows from 4°C to 9°C. A weak frontal system may bring light rain on Wednesday evening, but accumulations are expected to remain under 5 millimetres. Winds will be light, generally from the southwest at 10–20 km/h.
When could the first frost occur in London?
Based on historical data, the first fall frost in London typically arrives in early to mid-October. Overnight lows this week are staying above freezing, but by late October, clear nights could drop temperatures to 0°C or lower. Gardeners should monitor forecasts closely for frost advisories from Environment Canada.
Is it going to rain in London Ontario this weekend?
Current models show a 40% chance of light showers on Saturday, with less than 2 mm expected. Sunday should be mostly dry with increasing cloud. Check the live forecast above for updates as the weekend approaches.
How accurate is the London Ont weather forecast?
Environment Canada’s three-day forecast for London has a typical accuracy of 85–90%. Beyond five days, confidence decreases, so rely on the live forecast above for the most current data.
What is the best source for London Ontario weather alerts?
Environment and Climate Change Canada issues official warnings and watches for London. You can also monitor our Weather Warning page for live alerts.