A significant cold front is advancing towards Southern Ontario, bringing with it the coldest temperatures since May. A stark change in weather is anticipated as this front moves through the region on Tuesday.
Recent Warmth Turns to Chilly Weather
This past weekend, Southern Ontario experienced summer-like conditions, with temperatures soaring to the mid to upper 20s Celsius. Such warmth is typically observed in July.
Monday is expected to maintain these warm temperatures, with readings reaching as high as 30°C in some locations.
Cold Front Arrival
The forecast predicts a strong cold front will sweep across the area on Tuesday. Early Tuesday, Southern Ontario will still feel unseasonably warm, especially in the southern regions. However, as the cold front progresses, temperatures will begin to decline.
Rain is expected to accompany the front, with the possibility of thunderstorms. By Wednesday and Thursday, temperatures are likely to fall sharply, with some locations north of the Greater Toronto Area (GTA) struggling to reach 10–12°C.
Potential for Frost and Rainfall
Frost is expected on Thursday morning, particularly in rural and suburban settings, marking a significant shift from the weekend’s heat.
- Thunderstorms are predicted overnight Monday into Tuesday afternoon.
- Eastern Ontario will experience storm activity from Tuesday morning through the afternoon.
- The Niagara Peninsula faces the greatest risk of heavy rainfall, with potential totals of 20–30+ mm.
- The GTA can expect lower rainfall amounts, estimated between 5–15 mm.
As this October cold front brings thunderstorms and cooler temperatures, residents should prepare for possible travel delays and changing conditions. The shift in weather calls for caution, especially as the region transitions into a more autumnal climate.
