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Heat warnings stretch across Ontario including London-Middlesex

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Heat warnings are in effect for most of Ontario Tuesday including London-Middlesex, Sarnia-Lambton, Huron-Perth, Oxford and Elgin counties.

The multi-day will see high temperatures reaching near 31 C with humidex values in the upper 30s expected today and Wednesday.

Tonight's overnight low near 20 C will provide little relief from the heat.

Slightly cooler temperatures are expected on Thursday.

Tuesday: Sunny early this morning then a mix of sun and cloud with 40 per cent chance of showers this afternoon. Risk of a thunderstorm this afternoon. High 32. Humidex 41. UV index 10 or very high.

Tuesday Night: Partly cloudy. 40 per cent chance of showers early this evening with risk of a thunderstorm. Clearing late this evening. Low 22.

Wednesday: A mix of sun and cloud. 70 per cent chance of showers late in the afternoon with risk of a thunderstorm. High 30. Humidex 38. UV index 10 or very high.

Thursday: A mix of sun and cloud. High 29.

Friday: A mix of sun and cloud. High 29.

Saturday: A mix of sun and cloud. High 29.

Sunday: Cloudy with 60 per cent chance of showers. High 27.

Monday: A mix of sun and cloud with 30 per cent chance of showers. High 28.

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