It will be another warm and humid day in Ottawa to end the weekend. According to Environment Canada’s weather forecast for Sunday, it will be a mainly sunny day with some clouds in the afternoon. The temperature will reach a high of 27 C and the humidex will reach 33. Overnight, the low will be 18 C. On Monday, expect a 40 per cent chance of showers and a temperature high of 25 C. Tuesday will be a sunny day with a high of 26 C. On Wednesday, expect a chance of showers and temperatures reaching 26 C.