London, Ont. residents can look forward to a mainly sunny start on Sunday, with Environment Canada forecasting pleasant temperatures and clearer skies. As of Sunday morning, there were no air quality alerts in effect for London, but areas further southwest were still under a yellow air quality alert. Environment Canada says to expect a shift in weather patterns mid-week, bringing with it a chance of showers. Sunny skies and a high of 24C is expected on Sunday. The humidex will make it feel like 27C, and the UV index will be very high at 8. Tonight, conditions will remain clear with a low of 10C. Extended forecast for the London area: