The second week of July will bring the heat to Toronto and parts of the GTA with highs of 30C to 33C, and a heat warning in effect for Monday.

Environment Canada says the heat and humidity will last until Thursday, and kick off with a high humidex rating on Monday.

Some areas could see some relief due to showers and thunderstorms, but nights will be warm and muggy with lows of 20C to 23C.

Toronto will likely see showers on Wednesday through to Friday, but the rain is forecast to clear up in time for the weekend.

A cooler airmass will move in Thursday night, bringing an end to the heat and the warning.

The agency warns to take special precautions when temperatures are high, namely not leaving people or pets parked inside a car or in direct sunlight. Take extra care to stay hydrated to avoid heat-related illnesses, such as heat stroke or exhaustion.