South Simcoe Forecast for Monday April 28 New Tecumseth, ON, Canada / FM92 South Simcoe Today Adrianne Proceviat Apr 29, 2024 | 6:30 AM Tony Hisgett / CC Cloudy with scattered showers this morning… High 14. Cloudy with showers this evening… Risk of a thunderstorm… We could get 5 to 10 mm… Low 9. Showers ending early tomorrow afternoon… High 18.