Weekend festival-goers take note: Windsor-Essex, Chatham-Kent and Sarnia-Lambton are once again under heat warnings.
Environment Canada said Humdex will hit a low of 40 on Saturday and Sunday, while temperatures are expected to hit a low of 30. A mix of sun and cloud is forecast on both days, with a risk of showers on Sunday.
The agency said that the mercury is likely to remain above 20 degrees Celsius during the night.
The weather agency says people should take precautions, including drinking plenty of water and checking vulnerable friends and family.
This is the eighth heat warning announced for Windsor-Essex this year, but overall temperatures this summer have been around average, according to Environment Canada.
In the region, a heat warning is declared when there are two or more days and a minimum of 31 °C during the day and 21 °C or more is expected overnight.
The heat warning comes amid several weekend events, including the Windsor-Essex Pride Fest and the Comber Fair.
For those looking to beat the heat with a swim, note that not all beaches are recommended for swimming.
Belle River Beach and Mettawas Beach are unsafe to swim in due to high levels of disease-causing E.coli bacteria, according to the latest water quality test from the Windsor-Essex County Health Unit.