- Temperature
- Precipitation
- Wind
- Humidity
- Pressure
- Rain Chance
- Snow
Good Caring Canada delivers real-time weather updates from Sudbury, Ontario—offering an at-a-glance view of temperature, wind, precipitation, humidity, and more over a five-day forecast.
Whether you are stepping out for errands, planning a lakeside hike, or bundling up for a rainy stroll, knowing how the weather will shift—hour by hour and day by day—can help you dress smartly and move confidently through the week.
In Sudbury, Ontario, the weather does not gently shift—it transforms. Each season in this Northern Ontario mining town is a distinct chapter, punctuated by its own tempo of temperature swings, moisture levels, wind moods, and atmospheric personalities. For residents and visitors alike, Sudbury’s climate demands not only sartorial flexibility but a philosophical commitment to preparation.
This is a city where spring’s thaw is met with soggy boots, summer’s warmth arrives with a paradoxical chill in the breeze, autumn whispers cold truths beneath golden canopies, and winter—the headliner—throws down a meteorological gauntlet. The prudent Sudburian never leaves home without considering the hourly dance of the dew point, wind chill, or ultraviolet index.
Sudbury by the Season
Spring 🌸
From late March to May, Sudbury begins to shrug off winter’s weight. But make no mistake—spring is no gentle awakening. It is a messy negotiation between frost and thaw. Mornings hover near freezing, afternoons flirt with the low teens in Celsius, and evenings often retreat to single digits again.
This is the season of black ice in the morning and mud puddles by noon. Rainfall makes a steady entrance, especially in April, and wet snow may stubbornly linger into early May. Relative humidity climbs, often settling above 70 percent. The air feels damp and raw, even if the thermometer suggests modest comfort.
Layering is not optional—it is gospel. Waterproof footwear is essential, as sidewalks and driveways become battlegrounds of slush and thawing soil. A lightweight down vest over a fleece pullover works wonders, while a shell jacket with a hood guards against sudden drizzles. Carry gloves, even in April. And perhaps most crucially, invest in wool socks: cotton is an act of seasonal folly.
Summer ☀️
June ushers in a brief but gorgeous reprieve. Summer in Sudbury is not punishingly hot but richly comfortable. Highs hover in the low to mid-twenties Celsius, while nights often descend into the teens. Averages mask extremes—hot snaps can reach into the thirties, though seldom linger. Humidity is real but not suffocating, often in the 60 to 75 percent range, with an occasional muggy afternoon forcing indoor retreats or shaded picnics.
Thunderstorms are not rare, often appearing in sudden theatrical outbursts. The city’s abundance of lakes amplifies the cooling effect of breezes, particularly in the evenings. Mosquitoes and blackflies are ubiquitous in June and early July—an enduring side effect of the surrounding boreal forest and wetlands.
Think breathable but protective. Light cotton or moisture-wicking fabrics are ideal. Sleeves should be long enough to deter bites, especially during dawn and dusk. A wide-brimmed hat and sunglasses are non-negotiable when venturing outdoors during midday. Insect repellent should be considered an accessory, if not a cologne. Closed shoes or hiking sandals fare better than flip-flops on the city’s mixed terrain of gravel paths, wooded trails, and rocky hills.
Autumn 🍂
September in Sudbury begins with a golden flourish. Trees blaze with amber and crimson by late month, while the sun’s angle sharpens, casting longer shadows and a nostalgic tint. Daytime highs slip from the twenties into the teens and eventually into single digits by November. Frost becomes common by mid-October, and snow flurries may appear before Halloween.
Rainfall remains steady in September and October but begins to decline by November. Humidity falls off, creating dry, cool air that saps moisture from lips and knuckles alike. Winds grow gustier, especially across exposed ridges and lakeshores.
This is the season for wool, waxed canvas, and wind-resistant jackets. The savvy Sudburian resurrects their scarf collection and switches from sneakers to boots with decent tread. Gloves return to pockets by early October. Transition pieces—cardigans, insulated vests, thermal leggings—become mainstays. By November, parkas reappear in rotation, even if snow has not yet claimed the sidewalks.
Winter ❄️
Winter in Sudbury is not a season. It is a residency. It begins as early as mid-November and does not fully exit until late March. Temperatures regularly plunge below minus twenty degrees Celsius in January and February, with wind chills that can dip near minus forty. Days are short, skies are often overcast, and snowfall is not a periodic nuisance—it is a structural feature of the landscape.
Snowfall totals routinely exceed three hundred centimeters. The snow does not melt between storms—it accumulates. Roofs groan under the weight, driveways demand constant attention, and snowbanks grow high enough to obscure intersections. Wind is biting and persistent. The air is dry, contributing to chapped skin and static cling. Indoor heating can create its own weather system of parched throats and cracked cuticles.
This is where Sudburians truly distinguish themselves. The parka is a second skin, ideally rated for Arctic expeditions. Down insulation is standard, with hoods lined in faux or real fur to block wind. Mittens outperform gloves, and thermal base layers are not for skiing—they are for walking the dog. Footwear must be waterproof, insulated, and high enough to manage snowbanks. Hats should cover the ears fully, and balaclavas are common, especially among pedestrians and transit users. Children resemble padded astronauts, and even brief outdoor errands feel like polar expeditions.
