London is in for a warm Sunday with a mix of sun and cloud, before cooler and more unsettled conditions move in through the week. Fog patches will dissipate this morning, with winds becoming west at 20 km/h and gusting to 40 near noon. The high is expected to reach 25 C, with a humidex of 29. Tonight will be mainly cloudy with a 30 per cent chance of showers this evening before clearing overnight. Northwest winds will gust to 40 km/h, with a low of 11 C. The week ahead will bring cooler temperatures, with highs generally around 20 to 26 C. Several days will carry a chance of showers, including Tuesday and Thursday, while overnight temperatures will dip into the single digits by Friday.