The hot and muggy weather parked over southern Ontario may stick around through at least the middle of this week. The province will see a risk for storms on Monday as an upper-level trough over the Great Lakes picks up remnant tropical moisture from what’s left of Henri. More on Ontario’s storm threats and how long the heat and humidity will last, below.
MONDAY: REMNANT MOISTURE FROM HENRI TO TRICKLE IN, CHANCE FOR STORMS
Rain and thunderstorms in northwestern Ontario will continue to push northeast through Monday afternoon, moving out in the evening.
Farther to the south, an upper-level trough crossing the Great Lakes will pick up remnant tropical moisture and energy from Henri as we head into Monday.
The bulk of Henri's moisture will remain south of the border, which means we’re not looking at a widespread rainfall event for Ontario. However, scattered showers and embedded thunderstorms are possible for parts of southern Ontario during the heat of the day.
The daytime storm potential extends from the Niagara region to eastern Ontario and southern Quebec.
It’ll feel hot and sticky on Monday, with daytime highs hitting the 30-degree mark in most spots and feels-like values pushing into the upper 30s. The humidex could even hit 40 in a few spots in eastern and southwestern parts of the province.
BEYOND: MORE RAIN IN NORTH, POTENTIAL FOR HOT, MUGGY WEATHER TO LINGER IN SOUTH
Beyond, the next system for northwestern Ontario will track through the area on Tuesday or Wednesday. While rain totals next week will not be substantial compared to the system in the short range, this will help to further improve the wildfire situation.
Meanwhile, across the south, the muggy weather will continue to bring a risk for scattered thunderstorms, especially mid-week, but in general, the region will be fairly dry.
Temperature-wise, it will remain very warm for eastern areas through the middle of next week. Cooler weather will spread east across the region late next week.
Somewhat cooler weather is expected at the end of the week or the weekend, but model trends have really backed off on the potential for much cooler weather. It is possible that the heat and humidity will continue to dominate through next weekend.
The final days of August and into early September should be near seasonal or on the warm side of seasonal.
Stay tuned to The Weather Network for the latest forecast updates for Ontario.