🇨🇦 Weather in Markham
Current Weather in Markham
Small Craft Advisory issued July 20 at 11:57PM EDT until July 23 at 6:00AM EDT by NWS Buffalo NY
20°C
Feels like 20°C. Patchy rain nearby.
Map Overlays:
Hourly Forecast for Markham
09:00
21°
27%
10:00
22°
32%
11:00
24°
40%
12:00
23°
92%
13:00
25°
83%
14:00
27°
12%
15:00
27°
9%
16:00
28°
15%
17:00
25°
38%
18:00
25°
22%
19:00
24°
36%
20:00
22°
32%
21:00
20°
12%
22:00
18°
12%
23:00
17°
10%
00:00
15°
10%
01:00
14°
10%
02:00
14°
13%
03:00
13°
13%
04:00
14°
16%
05:00
14°
18%
06:00
14°
25%
07:00
14°
17%
08:00
14°
12%
14-Day Forecast for Markham
2026-07-21
Sunny
28° /
17°
2026-07-22
Patchy rain nearby
19° /
13°
2026-07-23
Partly Cloudy
25° /
12°
2026-07-24
Sunny
27° /
15°
2026-07-25
Sunny
28° /
17°
2026-07-26
Partly Cloudy
30° /
19°
2026-07-27
Patchy rain nearby
26° /
20°
Additional Forecasts for Markham
Air Quality
💨 US EPA Index 1 (Good)
CO (Carbon Monoxide) 216.0 μg/m³
O₃ (Ozone) 94.0 μg/m³
NO₂ (Nitrogen Dioxide) 9.5 μg/m³
SO₂ (Sulphur Dioxide) 3.8 μg/m³
PM2.5 (Fine particles) 10.2 μg/m³
PM10 (Coarse particles) 10.3 μg/m³
Historical Weather
Weather Forecasts for Other Cities in Canada
Weather in Markham — FAQ
Answers refreshed each request based on current conditions in Markham.
What is the weather like right now in Markham?
Right now in Markham, Canada the temperature is 20.1°C (feels like 20.1°C), with patchy rain nearby. Relative humidity is 94% and wind is 22.3 km/h.
What is today's high and low temperature in Markham?
Today's forecast high in Markham is 27.9°C and the overnight low is 16.6°C. The diurnal range — high minus low — depends on cloud cover; clear days swing more than overcast ones.
Will it rain in Markham today?
The chance of precipitation in Markham today is 79%. Forecast accuracy is highest within the next 6 hours and decreases steadily out to 14 days.
How often does the weather here update?
Current observations refresh every 15-60 minutes from the nearest monitoring stations operated by national meteorological agencies. The hourly forecast updates approximately every hour; the 7- and 14-day outlook is recomputed several times per day.
What does 'feels like' temperature mean?
Feels-like (apparent) temperature accounts for humidity, wind chill and direct sunshine — variables that change how the human body perceives heat or cold. On hot, humid days it can be 3-7°C above the actual reading; on cold windy days it can be 5-15°C below.
Why does the temperature in Markham differ from nearby cities?
Even short distances can change temperatures noticeably. Markham's reading reflects altitude, proximity to large bodies of water, urban heat island effects, and the exact location of the monitoring stations supplying the data. Coastal cities are typically milder and more humid than inland equivalents.