Extreme heat warning issued for weekend

The Middlesex-London Health Unit issued an extreme heat warning for Saturday and Sunday with temperatures reaching 33 degrees.

Environment Canada has issued a heat warning for Saturday and Sunday, with daytime highs of 31 to 33 degrees.

Overnight temperatures offer little relief, with lows of 21 to 25 degrees.

“It’s that warm, humid air coming in,” said CTV News London Meteorologist Julie Atchison.

The heat will end on Sunday afternoon, with more showers on the way heading in to Monday.

Friday remains sunny and warm, with a high of 28. Cloudiness will increase late this evening.

Here’s a look at the rest of the forecast

Friday: Sunny. High 28. Humidex 33. UV index 9 or very high.

Friday night: A few clouds. Increasing cloudiness late this evening then 30 percent chance of showers overnight. Risk of a thunderstorm overnight. Low 18.

Saturday: Mainly cloudy with 30 per cent chance of showers in the morning and risk of a thunderstorm. Clearing late in the afternoon. Wind becoming southwest 20 km/h gusting to 40 near noon. High 31. Humidex 38. UV index 9 or very high.

Sunday: A mix of sun and cloud with 40 per cent chance of showers. High 31.

Monday: A mix of sun and cloud with 40 per cent chance of showers. High 26.

Tuesday: A mix of sun and cloud. High 25.