South Simcoe Forecast for Wednesday March 27 New Tecumseth, ON, Canada / FM92 South Simcoe Today Adrianne Proceviat Mar 27, 2024 | 6:56 AM Isengardt / CC Mainly cloudy with the slight chance of showers today… Temperature steady near 6. Mainly cloudy this evening… Slight chance of showers or flurries… Low minus 5…. Wind chill minus 8. A mix of sun and cloud tomorrow… High 7 degrees.