South Simcoe Forecast for Friday April 19 New Tecumseth, ON, Canada / FM92 South Simcoe Today Adrianne Proceviat Apr 19, 2024 | 6:32 AM Diamond T Design Mainly cloudy today… We are expecting showers… High 14. Cloudy this evening… Slight chance of showers OR flurries… Low plus 2. Mainly cloudy again tomorrow… High 8.