Windsor is in for a mainly cloudy and humid Saturday, with a 30 per cent chance of showers and a risk of thunderstorms. Winds will become southwest at 20 km/h late this morning, with a high of 27 C and a humidex of 35. Tonight will be partly cloudy with a 30 per cent chance of showers and a risk of thunderstorms this evening. The low will be 18 C. Sunday will start with a mix of sun and cloud before a 40 per cent chance of showers develops in the afternoon. The high will be 27 C, with a humidex of 33.