Residents in Sarnia, Ontario, can expect a warm high of 14°C on March 20, 2026, before weather conditions change significantly in the afternoon. According to Environment Canada, there is a risk of thunderstorms as a new wind pattern moves into the area.
Winds that began as a southerly breeze at 20 km/h are forecast to swing to the north by the afternoon. These north winds will likely reach speeds of 30 km/h, with gusts as high as 50 km/h.
The shift in wind will bring much colder air to the region, leading to a quick drop in temperature. After the mild daytime high, the temperature is expected to fall to a low of -2°C tonight.
While there are no official weather alerts in place, residents should be prepared for these sudden changes in wind and temperature. The mix of unseasonable warmth and afternoon storms marks a notable shift for the local community today.
