Collingwood, Ontario, is starting the week of June 22, 2026, under comfortable but changeable skies, with a cool morning giving way to a warm afternoon and a slight chance of showers. Environment Canada says Monday will see a mix of sun and cloud, a high of 23 degrees Celsius, and a humidex of 26. There is a 30 percent chance of afternoon showers, and residents should be mindful of a very high UV index of 8 if heading outdoors.
The cool, unsettled pattern is expected to stay through much of the week. Tuesday and Wednesday are expected to remain mostly sunny, with daytime highs hovering around 21 to 23 degrees. But by Thursday, the outlook turns wetter, with a 60 percent chance of showers or thunderstorms and a high of only 21 degrees. The unsettled weather may linger Thursday night before skies clear on Friday.
Despite the damp midweek forecast, the weekend promises a warmup. Saturday is expected to reach 25 degrees under a mix of sun and cloud, and Sunday could climb even higher to 26 degrees, nudging past the seasonal norm of 24. No weather alerts are in effect for Collingwood as of Monday.
According to The Weather Network, the on-again, off-again feel of the week lines up with Ontario’s 2026 summer forecast, which warns of a changeable season. The Weather Network meteorologist Tyler Hamilton, with guidance from senior meteorologist Dr. Doug Gillham, notes that cooler-than-normal Great Lakes may contribute to early-summer shoreline chills and frequent shower interruptions across southern Ontario, though the summer won’t be a total washout.
For Collingwood, the shifting conditions are typical of late June. Historically, the town sees average daytime highs around 20 degrees Celsius over the full month of June, though the seasonal normal for late June is closer to 24 degrees, with roughly 10 rainy days and about 94 millimetres of total rainfall. The current forecast suggests residents can expect a week that mirrors that pattern: a cool, fresh start, a soggy Thursday, and a warming finish.
