Humidity Hangs Heavy as Toronto Heats Up

TORONTO — May 6, 2025: Whether it’s the victory celebration mist or just classic spring unpredictability, Toronto’s Tuesday begins with a hazy hello and lingering moisture in the air. This morning, the city woke up to 8.6°C and a thick mist shrouding the skyline—perhaps echoing the afterglow of a Maple Leafs Game One win over the Panthers.

Showers, Fog, and Thunderstorms on the Weather Roster

As of 7:38 a.m. at Toronto Pearson International Airport, the barometric pressure sits at 101.5 kPa and is falling, signaling more change on the horizon. The wind is coming in from the southeast at 23 km/h with gusts reaching up to 37 km/h, which could make your morning coffee commute feel a bit blustery. Humidity is practically tropical at 96%, so good luck keeping your hair in place.

Visibility is limited to just 1.2 km, thanks to those fog patches which will gradually lift as the morning progresses. Expect showers to taper off by mid-morning, but don’t pack away the umbrella just yet. There’s a 30 percent chance of additional showers later today, with the added drama of a possible afternoon thunderstorm. The high will reach a mild 18°C under mainly cloudy skies, with the UV index climbing to 7—classified as “high”—so sunscreen is still a smart play if the sun peeks through.

Tonight, the city remains mostly cloudy with a continued 30 percent chance of showers and a mild low of 12°C.

Midweek Mix of Sunshine and Soggy Surprises

Looking ahead to Wednesday, May 7, the forecast calls for a mix of sun and cloud, with a 30 percent chance of showers late in the afternoon. Winds will shift to the north at 20 km/h later in the day, bringing a high of 20°C and a UV index of 8—”very high”—so bring the SPF and keep those sunglasses handy.

By Wednesday night, skies become cloudy again with a 30 percent chance of more showers and a cooler low of just 3°C. Thursday promises a refreshing break, featuring a mix of sun and cloud and a high of 13°C. Thursday night will bring cloudy periods with the temperature again dipping to a brisk 3°C.

What to Wear?

Layer up this morning to cut through the mist and keep a light waterproof jacket or umbrella close by for those intermittent showers. You might need to switch to a lighter layer or short sleeves by afternoon, especially if the sun breaks through and temperatures rise. And with that UV index creeping up, don’t forget the sunscreen—even under partly cloudy skies.

Toronto Weather Trivia

Did you know? On this date in Toronto weather history, the warmest temperature ever recorded was a balmy 29.4°C in 1913, while the coldest was a nippy -2.2°C in 1978. May really does keep us on our toes.