You’ll need more than an umbrella to stay dry out there today, folks. We’re talking rubber boots, raincoats, the whole nine yards. Environment Canada has issued widespread weather warnings across southern Ontario about heavy downpours, isolated thunderstorms, and potential flash floods.

The rain is set to continue for the whole day on Wednesday and into Thursday. By the time it’s all said and done, up to 75 mm of rain is expected to fall in parts of the city. According to The Weather Network, that’s about as much rain as Toronto gets throughout the entire month of September, on average.

And that’s not even the worst of it. Over the next couple of days, parts of southern Ontario’s rainfall amounts could top totals recorded from the entire year.

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The heaviest downpours will take place in regions outside of the GTA, including Kincardine, Parry Sound, and Windsor, where anywhere from 75 mm to over 100 mm is expected, reports The Weather Network.

Environment Canada says we can thank the American Mid-West for the bad weather, where a “moisture-laden low-pressure system” is travelling up and across to Ontario.

“Heavy downpours can cause flash floods and water pooling on roads,” says the warning. “Localized flooding in low-lying areas is possible.”

Drivers may be dealing with reduced visibility today, and Environment Canada’s advice is to turn on your lights and maintain a safe following distance between cars.

As for what the fall season will bring, it looks like we’ll be back to mostly sunny and pleasant conditions for the next several weeks. Unfortunately, though, the weather outlet predicts that we’ll be getting hit with an earlier start to winter than normal, with frigid temperatures and snow well underway by the time the holiday season rolls around.