Ottawa can expect a sunny day on Tuesday as summer ends and fall officially arrives. The fall equinox occurs at 8:05 p.m., but before that, expect a clear sky and a high of 17 C in the afternoon. A frost advisory remains in effect for the morning. Environment Canada is warning of patchy frost in some areas, which could affect plants and crops. Tonight, expect a clear sky and a low of 4 C. On Wednesday, the high is 19 C, with more sunshine in the forecast. Thursday is also looking sunny with a high of 20 C. Sunshine and a high of 21 C round out the work week on Friday.
