Friday will be another hot, humid day in Ottawa as the last long weekend of summer arrives. Environment Canada’s weather forecast for the capital calls for a high of 24 C with a humidex of 29. There is a 30 per cent chance of showers in the afternoon. Overnight, expect a mainly cloudy sky and a low of 14 C. Saturday is looking cloudy with a 40 per cent chance of showers and a risk of a thunderstorm in the afternoon. The forecast high is 24 C with a humidex of 28. Sunday’s outlook is sunny with a high of 24 C. Labour Day Monday is looking sunny with a high of 26 C. The average high for this time of year is around 21 C.