Calgary Weather: Sunny 18C Thursday Before Weekend Cool Down and Showers Calgary will enjoy a sunny 18C Thursday before a weekend weather shift brings strong winds, cooler temperatures in the low teens, and possible showers on Saturday. Calgary will experience a pleasant autumn day on Thursday, with a sunny morning giving way to building clouds in the afternoon. The high will reach 18C, which is on the higher end of the seasonal range for the city, but a change is coming for the weekend. Calgary Weather: Sunny Thursday Before ChangeThe day will start bright and sunny, making it ideal for outdoor activities. As the afternoon progresses, clouds will begin to build, but conditions will remain mild. The high of 18C is above average for this time of year, offering a brief taste of late summer before fall settles in.Residents should enjoy the warmth while it lasts, as the forecast indicates a significant shift over the next few days. The transition will begin on Friday as a trough in the upper atmosphere digs into southern Alberta from the west.Weekend Weather Shift Brings Wind and Cooler AirFriday will see increasing clouds and strong southwesterly winds at 30-50 km/h as the trough approaches. These winds and cloud cover will briefly make temperatures warmer, with an anticipated high of 22C. This warmth, however, is deceptive and short-lived.By Saturday, the low will track further into the province, ushering in cooler air that will drive high temperatures down into the low teens across Alberta. There is also a potential for showers over the weekend, with Calgary facing about a 30 per cent probability on Saturday.Higher chances for rain are expected in southern Alberta, particularly near the Saskatchewan border in regions like Medicine Hat, and to the west over the Rocky Mountains and foothills. These areas may see more consistent precipitation as the system moves through.Return to Seasonal Conditions by MondayThe trough will weaken as the jet stream levels out near the end of the weekend. This will bring a return to both seasonal temperatures and stable conditions by Monday. Calgarians can expect a more typical autumn pattern to resume, with calmer weather and temperatures closer to normal.Overall, the brief warm-up on Friday will give way to a cooler, potentially wet weekend, so residents should plan accordingly. Staying updated with the latest forecasts will help in making weekend plans, especially for outdoor activities.