A cold front ushered in some cooler and less humid air late Monday afternoon but it's going to heat up again today.
Environment Canada's heat warning continues for all of Sarnia Lambton. Daytime highs in the low 30s will continue through until Thursday with a humidex in the mid-30s Tuesday and near 40 C Wednesday and Thursday.
Overnight lows will be in the low 20s, perhaps a little cooler in some rural areas so we won't get another dose of cooler weather until Friday when another cold front passes through the area.
