Residents in St. Thomas, Ontario, are facing periods of rain and a risk of thunderstorms today, March 20, 2026, as an active weather system moves through the region. This weather event marks a wet start to the day and could lead to changing road conditions or potential utility impacts from gusty winds.
According to Environment Canada, the periods of rain that began early this morning are expected to end this afternoon. The forecast then calls for a 40 per cent chance of showers later in the day, with a risk of thunderstorms developing during the afternoon hours.
Northwest winds are expected to reach 30 km/h with gusts as high as 50 km/h by this afternoon. These blustery conditions are moving in as the area transitions from earlier winter-like weather to more active spring patterns.
While the daytime high is expected to reach a mild 13°C, residents will likely notice a sharp drop in temperature as the day ends. The overnight low is forecast to hit -2°C, and the wind chill could make the air feel as cold as -6°C by tomorrow morning.
The sudden shift in temperature and the risk of afternoon storms follow a period of volatile spring weather in the region. Local residents are encouraged to stay aware of changing conditions, although no official weather alerts are currently in effect for the area.
