Temperatures to Soar Above 20°C Across Southern Ontario on Tuesday With Gusty Winds
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As we step into the first days of November, the temperatures outside might have you double-checking the calendar, as the unusually warm trend of this fall continues. This lingering seasonal tug-of-war between cold and warm air has led to temperature swings from near-freezing to over 20°C in the past few weeks.
Despite the calendar saying November, it’ll feel more like early fall on Tuesday as temperatures rise to around 20°C across much of Southern Ontario. Accompanying this brief warm-up will be strong wind gusts, reaching 70-80 km/h in some areas.
A warm front moving across Southern Ontario is bringing in this surge of mild air, making its presence felt overnight into Tuesday. Already, spots around Lake Erie in southwestern Ontario are feeling this effect, with temperatures climbing near the 20°C mark by Monday evening.
In contrast, parts of Central Ontario and the Ottawa Valley have remained in the single digits, with areas near Ottawa hovering close to freezing. But don’t worry; that’s about to change as warmer air spreads in!
Overnight, temperatures will gradually rise, with most of Southern Ontario waking up to mild conditions in the mid to upper teens. In Central and Eastern Ontario, expect to start the day with temperatures in the lower teens.
Throughout Tuesday, the warm-up will continue, with daytime highs near 20°C or slightly higher in some areas. The latest data suggests the warmest air will be centred along the Golden Horseshoe and deep southwestern Ontario, including cities like Windsor and Chatham, where temperatures could reach 21-24°C. Some locations may even approach record highs, though with records around 23-25°C in many spots, breaking them might be a tall order.
The rest of Southern Ontario, except for the Bruce Peninsula and northern parts of Central Ontario, will enjoy temperatures around 18-21°C. Northern regions, including Tobermory, Parry Sound, Huntsville, and Algonquin Park, will see slightly cooler temperatures around 15-18°C. Meanwhile, Northeastern Ontario will experience mild conditions, with highs in the low to mid-teens.
TEMPERATURES 10-14°C ABOVE SEASONAL- MAP FROM WEATHERBELL
If 20°C temperatures in November seem strange, you're right! Daytime highs for this time of year are typically in the upper single digits or low teens, so we’re looking at temperatures around 10-14°C above average across Southern Ontario on Tuesday.
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Winds will also be a key feature on Tuesday, with gusts approaching 70 km/h across much of Southern Ontario by the morning. These winds should weaken somewhat later in the day but are expected to pick up again overnight into early Wednesday.
A few areas—particularly around Lake Erie, Niagara, higher elevations east of Lake Huron, and northeast of Georgian Bay—could see stronger gusts up to 80 km/h, although this will be highly localized. Most places should expect gusts around 70 km/h, with winds easing off by late Wednesday morning.
Northeastern Ontario will see heavy rain beginning early Tuesday morning and lasting through the day and night, with rainfall totals reaching 30-50 mm by Wednesday afternoon in some spots.
Southwestern Ontario will also see moderate to heavy rain starting early Wednesday morning, which will then spread eastward to the Golden Horseshoe and Eastern Ontario by late morning. However, some models indicate that the rain might weaken before reaching Eastern Ontario, resulting in only a few millimeters. Southwestern and Central Ontario could see rainfall amounts of 5-15 mm.
Wednesday will bring a dramatic change as a cold front sweeps across Southern Ontario, leading to a significant temperature drop by the day’s end. By Wednesday evening, temperatures across much of Southern Ontario will fall sharply into the low to mid-single digits, giving us a reminder that winter is just around the corner.
