Residents in Plympton-Wyoming, Ontario, should prepare for a sudden shift in weather as a mild week turns colder. Environment Canada reports the transition begins Tuesday night, January 13, 2026, with daytime highs falling from the low single digits (around +2–+3°C) to daytime highs near −8°C by Thursday as the coldest air arrives. Environment Canada forecasts snow and conditions that could lead to icy roads.
The unseasonably warm air will be pushed out by a cold front, moving the community from light drizzle to flurries and periods of snow. This rapid change is expected to cause a thaw–refreeze cycle: standing water and recent melt can quickly freeze as temperatures fall below zero, creating hazardous walking and driving conditions, Environment Canada notes in its public bulletins. Official bulletins warn of flurries and the risk of squalls in parts of the region.
Local drivers on rural roads and provincial highways (including Highway 402 in past similar events) may face slippery surfaces, including black ice — a thin, nearly invisible coating of ice that can make pavement look dry while actually being frozen and dangerously slick. Snow and blowing snow are possible, and strong gusts can reduce visibility.
Intermittent snow is possible through the weekend as cold air moves over Lake Huron, and Environment Canada says lake-effect flurries could develop and briefly reduce visibility while driving.
This cold snap follows a period of unusually warm weather across Ontario, a trend reported by CP24 in early January. Local outlets such as Sarnia News Today have also previously warned of snow squalls and gusty winds in the region; residents should monitor Environment Canada forecasts and local authorities for the latest advisories.
