A weakening frontal boundary will bring a slight chance of light rain on Saturday, but Sunday looks mostly dry, though an approaching shortwave introduces some uncertainty
A settled and dry weather pattern is in place across Sault Ste. Marie and the broader Algoma region will be relatively short-lived, however, as an active pattern is set to develop through the weekend and into early next week. A weakening frontal boundary will bring a slight chance of light rain on Saturday, but Sunday looks mostly dry, though an approaching shortwave introduces some uncertainty. The more significant weather concern arrives early next week, when a surface low-pressure system tracking across the Great Lakes region is expected to bring a broader round of showers and the potential for embedded thunderstorms, along with locally higher rainfall totals.
On Friday, high pressure remains positioned directly overhead, and skies will be mostly sunny except for a few isolated showers north of the city in the morning. Southwesterly winds will be light, at 10 km/h with gusts up to 20 km/h during the afternoon hours. The high will reach 27°C, with overnight temperatures falling to near 15°C under mainly clear skies.
Saturday, a weakening frontal boundary associated with a surface low over northern Alberta will approach the Sault area by afternoon and evening. Cloud cover will increase through the day. A brief period of light rain is possible, primarily during the afternoon and evening hours, with any accumulation expected to remain at or below 1mm. The high will reach 25°C. The frontal system is expected to weaken considerably before reaching the region, limiting both rainfall totals and coverage.
Sunday will likely remain dry across the Algoma region, though an approaching weak system combined with some moisture means one or two isolated showers cannot be entirely ruled out. Skies will be partly to mostly cloudy at times. The high is expected to reach 28°C, with overnight lows near 16°C.