Residents in Brockville, Ontario, can expect a sudden shift to warmer and wetter weather starting Thursday night, March 5, 2026, as temperatures are forecast to climb well above the seasonal average. According to Environment Canada, the area will see a significant warming trend that will likely bring a high of 11°C by Saturday, March 7, 2026.
This warm spell is a major change from the usual weather for early March in the city. Typically, Brockville sees daytime highs of 1°C and overnight lows of -8°C during this time of year.
Along with the mild temperatures, the region is expected to see plenty of rain. There is a 70 per cent chance of rain beginning on Thursday night, followed by more showers throughout Friday and Saturday.
People living in the area should prepare for wet and slushy conditions as the ice and snow react to the double-digit temperatures. This unseasonably warm system is a sharp departure from the cold conditions usually found along the St. Lawrence River during the transition into spring.
