A heat warning remains in effect for the region, with high temperatures and humid conditions expected to continue through Thursday night. Environment Canada says daytime highs will range from 30 C to 32 C, with overnight lows between 20 C and 23 C, providing little relief from the heat. Humidex values are expected to reach near 40. Thursday is forecast to be mainly cloudy, with a 60 per cent chance of showers and a risk of thunderstorms. Fog patches are expected to dissipate in the morning. The high is expected to reach 30 C, with a humidex of 38. Showers and a risk of thunderstorms are expected to continue Thursday night, with cloudy skies and a low of 20 C. Fog patches may develop after midnight. Conditions are expected to ease Friday, although it will remain warm and humid. The forecast calls for cloudy skies with a 40 per cent chance of showers and a risk of thunderstorms. The daytime high will reach 29 C, with a humidex of 37. Temperatures are expected to gradually moderate through the weekend, with highs near 26 C on Saturday, 27 C on Sunday and 25 C on Monday.