South Simcoe Forecast for Wednesday April 24… brrrrrr New Tecumseth, ON, Canada / FM92 South Simcoe Today Adrianne Proceviat Apr 24, 2024 | 6:35 AM Lorie Shaull / CC Cloudy with the chance of scattered showers early this morning… Sunny periods this afternoon… High plus 5. Clear this evening… Low MINUS 4…WIND CHILL… MINUS 8 . Sunshine tomorrow… High 11.