Toronto is set to feel its first true taste of fall chill Wednesday night, with temperatures expected to drop to 3°C under clear skies — cold enough for patchy frost to develop in parts of the city and surrounding regions.The dip follows a dramatic shift in weather earlier this week. On Tuesday, Toronto experienced its first significant rainfall in weeks, marked by showers and thunderstorms that brought an end to a prolonged stretch of mild, dry conditions. That rain ushered in a cooler air mass, setting the stage for crisp nights and seasonable daytime highs.The forecast calls for abundant sunshine through the remainder of the week, with daytime highs hovering between 14°C and 18°C — right in line with seasonal norms for early October.On Wednesday, we can expect a daytime high of 15°C, clear skies, and a low of 3°C overnight, with frost possible. Thursday’s high is forecast at 14°C, with sunny skies, and an overnight low of around 6°C.Temperatures will gradually rise to 18°C and 19°C to cap off the week and kick off the weekend in Toronto, with clear conditions expected across the board. The only chance of cloudier skies is forecast for Sunday, Oct. 12.Looking ahead to the long weekendHistorically, Toronto’s average high for the second week of October sits around 15–16°C, with lows near 7°C. This week’s forecast aligns closely with those averages, though the overnight low of 3°C marks one of the chilliest readings so far this fall.The fall weather pattern mirrors what the city experienced in October 2024: a rainy start to the month followed by several days of clear, cool sunshine leading into Thanksgiving.With no rain in the forecast through the long weekend, Torontonians can expect ideal conditions for outdoor gatherings, fall hikes, and Thanksgiving celebrations.Click here to sign up for the CityNews Weather Guarantee and to check out Toronto’s extended forecast.