From Ice to Almost Summer: Greater Sudbury Enjoys a Classic Spring Flip

SUDBURY – WEATHER REPORT – A brisk -2°C start might have you thinking winter is still lurking in the shadows, but don’t be fooled—Sudbury’s stepping into a full-on spring swing this week. With sun-filled skies and a sharp rise in temperatures, we’re heading from windshield scraping to sunscreen slathering in just 48 hours.

Sudbury’s Spring Forecast: Cold Morning, Hot Streak Ahead

As of 6:00 AM EDT, it’s mainly sunny over Greater Sudbury Airport, but the air has a serious chill at -1.7°C. The dew point is -4.3°C, and the humidity is sitting at 82%, making for a frosty morning with a wind chill near -5°C thanks to a gentle northeast breeze at 9 km/h. Barometric pressure is a solid 103.0 kPa and rising, signaling stable, sunnier weather on the horizon.

Today’s forecast is a tale of two seasons: we begin with crisp morning air but warm up to a pleasant 15°C this afternoon under sunny skies. Winds will shift southward and pick up to 20 km/h with gusts reaching 40, so be ready for a breezy but bright Sunday. The UV index will hit 7—classified as high—so sun safety should still be part of your plan, even if you start the day in gloves.

Tonight, expect clear skies transitioning to partly cloudy conditions by evening. Winds will settle late, and the overnight low will hold at a much warmer 7°C—no frost advisories in sight.

Monday will be a beautiful day: full sunshine, southwest winds at 20 km/h becoming light later in the morning, and a high of 24°C. The UV index jumps to 8—very high—so SPF and shades are a must. Monday night remains clear and mild with a low of 9°C.

Tuesday brings a mix of sun and cloud with a balmy high of 25°C—perfect for patios, park walks, and anything that isn’t shoveling snow. Clouds move in overnight with a 30 percent chance of showers and a low of 13°C.

By Wednesday, skies will remain cloudy with that same 30 percent shower chance continuing. The high will be a still-pleasant 22°C, with another cloudy and mild night dipping to 13°C.

From Parkas to Picnic Gear: What to Wear

Sudbury’s weather is in full transition mode. Today calls for layers—start with a warm coat in the morning, and by mid-afternoon, you’ll be rolling up your sleeves. By Monday, short sleeves and sunglasses take over. Don’t underestimate the sun—even cool breezes can’t block UV rays, which will be cranking into the very high zone.

Historical Highs and Lows for May 11

Sudbury’s record high for May 11 is a summery 28.3°C, while the record low is -6.1°C. With today’s frosty start, we’re closer to the cold end of the spectrum—but this week’s highs in the mid-20s are pulling us right up to the warm side.

Sudbury Weather Trivia

Sudbury’s rocky terrain and high elevation often mean cooler mornings than surrounding areas. In spring, it’s not unusual to scrape frost off your windshield at 6 AM and soak up 20+ degree sunshine by 2 PM. It’s one of the few places where your winter coat and shorts might both make sense—on the same day!