Spring Heat Peaks Today as Cloudier, Damp Days Line Up Midweek

SUDBURY – WEATHER REPORT – Sudbury is set to enjoy one last blast of early-season warmth today before spring showers and a cooler, cloudier pattern take hold starting tonight. Residents can soak up sunshine and a surprising high of 28°C today—well above seasonal norms—before the skies close in and bring a damp, foggy, and cooler shift beginning Wednesday.

Sunshine Fades to Clouds: The Forecast at a Glance

At 7:00 AM EDT this morning, the thermometer at Greater Sudbury Airport is already sitting at a mild 12.3°C under mostly cloudy skies. Humidity is at 62%, with a comfortable dew point of 5.2°C. Winds from the east-southeast are moving at 15 km/h, and barometric pressure is 101.8 kPa but falling, a sign that the sunny spell won’t last long.

Today will be the toastiest of the week, with skies clearing for sunshine and winds shifting to the south, increasing to 20 km/h and gusting to 40 km/h later this morning. The high will soar to 28°C, and the UV index is sitting at a skin-sizzling 8—very high—so sunscreen, sunglasses, and shade are all in order for any outdoor plans.

Tonight, cloud cover will increase, bringing a 30 percent chance of showers or drizzle overnight. Fog patches will also develop as the damp air settles in. Winds will continue from the south at 20 km/h, and the low will stay warm at 15°C—still above the seasonal average.

Wednesday will feel like a different world, as the morning fog dissipates into cloudy skies with a 30 percent chance of showers or drizzle, increasing to a 70 percent chance of showers by midday. Winds will shift to the southeast at 20 km/h before becoming light late in the morning. Highs will only reach 17°C, and the UV index will ease to 5—moderate—a much more typical May day. The night will remain cloudy with a 30 percent chance of showers and a low of 13°C.

Thursday will see a mix of sun and cloud with a 30 percent chance of showers and a slightly warmer high of 22°C. The night will bring increasing cloudiness and a mild low of 14°C.

Friday will be a full-on shower day, with rain expected and a much cooler high of 17°C. The night will remain cloudy with a low of 11°C.

Wardrobe Wisdom for Sudbury’s Sudden Spring Shift

Today is your day to break out the shorts and t-shirts—but keep the raincoat handy for tomorrow, as clouds and drizzle take over. Foggy mornings will make driving a little trickier midweek, so plan accordingly and swap those sunglasses for windshield wipers.

Historical Weather for May 13

Sudbury’s record high for today is a warm 29.4°C, while the record low is -2.6°C. With today’s high forecast at 28°C, the city is well within striking distance of its all-time May 13 heat record.

Sudbury Weather Trivia

Did you know? Sudbury’s location atop the Canadian Shield makes it prone to sharp weather shifts—warm southerly winds can bring summer-like temperatures one day, only to be followed by cool, moist air from Georgian Bay the next. Classic Sudbury spring!