It will be a sunny, hot and humid start to the final week of July in Ottawa, but cooler-than-normal temperatures and rain are expected this week. Environment Canada’s forecast calls for a mix of sun and cloud today with a 40 per cent chance of afternoon showers. There is a risk of a thunderstorm. High 28 C with the humidex making it feel like 36. It will be mainly cloudy tonight with a 60 per cent chance of showers and a risk of a thunderstorm. Low 18 C. Tuesday will be mainly cloudy with a 70 per cent chance of showers. There will be a risk of a thunderstorm. High 24 C. Wednesday will see mainly cloudy conditions with a chance of showers. High 25 C. The outlook for Thursday calls for a mix of sun and cloud with a 30 per cent chance of showers. High 26 C. Friday will see a mix of sun and cloud. High 28 C. The normal temperatures for this time of year are a high of 27 C and a low of 16 C. August weather Temperatures in the month of August are expected to be near normal in Ottawa, according to Environment Canada. The monthly forecast calls for temperatures to be around normal to below normal over the next four weeks.