Discover the best time of year, based on historical climate, temperature, and precipitation.
The best weather in Markham is from July, August, September, but considering flight prices and crowds, the best months to visit are May, July, September. — predictable climate
🌨Cold
Contains affiliate links.
Contains affiliate links.
Contains affiliate links.
| Score | 11 | 12 | 14 | 25 | 79 | 79 | 81 | 80 | 85 | 51 | 16 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Climate | Polar | Polar | Cold | Cold | Mild | Humid | Humid | Humid | Pleasant | Cold | Cold | Polar |
| Temperature | -8–-1°C | -9–0°C | -4–5°C | 1–11°C | 8–18°C | 14–23°C | 17–27°C | 17–26°C | 14–22°C | 7–15°C | 1–8°C | -4–3°C |
| Feels like | -13–-5°C | -14–-4°C | -9–1°C | -3–8°C | 6–18°C | 12–24°C | 17–28°C | 17–27°C | 13–22°C | 5–13°C | -3–4°C | -8–-2°C |
| Precipitation | 71mm 10 days | 62mm 9 days | 69mm 10 days | 106mm 12 days | 75mm 10 days | 96mm 12 days | 83mm 12 days | 86mm 11 days | 67mm 10 days | 88mm 12 days | 63mm 10 days | 78mm 11 days |
| Sunshine | 3.8h ☀︎ 41% | 5.4h ☀︎ 51% | 7.0h ☀︎ 58% | 8.1h ☀︎ 60% | 10.9h ☀︎ 74% | 12.0h ☀︎ 78% | 12.6h ☀︎ 83% | 11.4h ☀︎ 82% | 9.9h ☀︎ 79% | 6.6h ☀︎ 60% | 5.0h ☀︎ 51% | 3.2h ☀︎ 36% |
| Wind | W · 21 km/h | W · 22 km/h | NW · 22 km/h | NW · 22 km/h | NW · 18 km/h | W · 18 km/h | W · 17 km/h | W · 17 km/h | W · 17 km/h | W · 20 km/h | W · 20 km/h | W · 20 km/h |
| Humidity (%) | 74% | 72% | 68% | 67% | 67% | 67% | 70% | 73% | 75% | 74% | 75% | 78% |
| Perfect days | 0% | 0% | 0% | 3% | 26% | 43% | 44% | 52% | 42% | 11% | 1% | 0% |
| Dry streak | 7d | 7d | 8d | 7d | 8d | 6d | 6d | 8d | 9d | 6d | 7d | 7d |
| Sunny streak | 4d | 7d | 9d | 10d | 15d | 19d | 20d | 20d | 14d | 8d | 5d | 4d |
| Extreme cold | 90% | 94% | 78% | 31% | 1% | — | — | — | — | 3% | 40% | 77% |
| Temperature | +0.9° | +2.9° | +3.3° | +0.3° | +1.8° | +1.1° | +1.4° | +0.6° | +0.6° | +1.5° | +0.8° | +2.4° |
| Rainfall | Stable | Stable | Stable | Stable | Stable | Stable | Stable | Getting wetter | Stable | Stable | Stable | Stable |
| Ideal warm days | 0% | 0% | 0% | 0% | 6% | 13% | 30% | 26% | 9% | 1% | 0% | 0% |
| Outdoor comfort | 0% | 0% | 1% | 4% | 29% | 40% | 33% | 42% | 42% | 12% | 1% | 0% |
| Dry week odds | 8% | 8% | 9% | 7% | 11% | 4% | 3% | 9% | 15% | 4% | 9% | 4% |
| Heavy rain | 1% | 1% | 1% | 2% | 3% | 3% | 2% | 2% | 3% | 2% | 1% | 2% |
| Snow days | 53% | 52% | 33% | 16% | 1% | — | — | — | — | 2% | 19% | 46% |
| Muggy days | — | — | — | — | — | 3% | 7% | 9% | 3% | — | — | — |
| Day length | 9.3h | 10.5h | 12.0h | 13.5h | 14.8h | 15.4h | 15.1h | 13.9h | 12.5h | 11.0h | 9.7h | 9.0h |
| Tourist Crowds | Low season | Low season | Low season | Shoulder season | Shoulder season | High season | High season | High season | High season | Shoulder season | Shoulder season | Shoulder season |
One of Ontario's oldest agricultural fairs, this early-October event fills the fairgrounds with livestock shows, a midwa…
On pure meteorology, September looks like the textbook month for Markham, but May is where the town actually comes alive: the energy is fresher, daylight stretches toward eleven hours, and you catch the city before regional traffic tightens its grip.
Markham sits just northeast of Toronto, a place where deep-rooted agricultural history meets rapid suburban sprawl and one of Canada's most diverse culinary scenes. Most guidebooks will point you straight to late summer or early autumn, seduced by crisp September afternoons. That is a mistake. While September technically yields the gentlest weather on paper, May offers the true reward. It carries a genuine sense of awakening across the river valleys and historic hamlets, before the humidity sets in and before the surrounding highways back up with seasonal commuters.
Standard advice tells you to hold out for early autumn, but May is the month that earns your time. The air warms comfortably into the high teens, daylight surges to nearly eleven hours, and the lingering grey chill of early spring finally snaps. There is a palpable lightness across the city. Strolling the boardwalks of Toogood Pond Park or wandering the 19th-century clapboard storefronts of Main Street Unionville feels relaxed rather than competitive.
You avoid the midsummer humidity that blankets the Greater Toronto Area later in the year, and you skip the heavy domestic road-trip traffic. The city's expansive network of trails—particularly through Milne Dam Conservation Park—dries out, filling with returning songbirds and early greenery. If you visit now, you catch Markham in an open, unhurried mood that evaporates once peak summer arrives.
Summer in Markham is intensely green, long, and humid. June eases you in with warm evenings and long dusks, making it ideal for walking along the Rouge River or lingering outside after dark. By July and August, afternoon temperatures climb regularly toward the upper twenties, and the humid air makes the pavement radiate heat.
While July thins out slightly as locals scatter toward cottage country, August reverses the trend sharply. It is one of the busiest months of the year, bringing crowded parking lots around trailheads and long waits at local dining hubs. If you are here in midsummer, shape your days around early mornings and late twilights. Spend the midday hours under tree canopies in Rouge National Urban Park, where shaded valley paths offer relief from the sun.
September is undeniably pleasant: stable, dry, and mild, with crisp evenings that invite light jackets. Yet it lacks the forward momentum of May. By the time October arrives, temperatures slide into brisk single digits, rain showers grow more frequent, and daylight shrinks noticeably.
Still, early October holds one major anchor: the Markham Fair. As one of Ontario's oldest agricultural celebrations, it pulls thousands to the fairgrounds with livestock rings, demolition derbies, and harvest displays. It is a genuine bridge back to the area's rural roots, best enjoyed with cider in hand while navigating the muddy midway. Once the fair packs up, autumn recedes rapidly into bare branches and biting winds.
November presents the calendar's biggest contradiction. Despite miserable conditions—dull skies, damp winds, and temperatures hovering just above freezing—the city hits peak capacity. Retail corridors and commercial plazas fill to the brim with regional shoppers gearing up for the holidays. It is the single most congested time to navigate the roads, paired with some of the least forgiving weather.
From December through March, winter settles in completely. Sub-zero temperatures, freezing slush, and brief, overcast days push life indoors. Historic Markham Village goes quiet under blankets of snow, and outdoor exploration requires heavy layers and serious wind protection. April brings the thaw, but it is notoriously wet, muddy, and raw—a transition month you should happily bypass while waiting for May.