Hot and humid on Sunday — Hot, humid and wet on Monday.

That’s the GTA forecast from Environment Canada

Environment Canada has issued a heat warning for much of southern Ontario, with temperatures expected to reach the low 30s, and humidex readings upwards of 40 on Sunday and Monday.

The affected area reaches from Windsor eastward to Durham Region on the east side of the Greater Toronto Area, and north to southern Huron County.

The sunny and hot conditions are likely to cause higher pollution levels in the Golden Horseshoe region as well as southwestern Ontario.

With the heat and humidity on Monday, we can also expect some showers and thunderstorms in the afternoon..