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| Extended Forecast - Environment Canada | ||||||
Thursday
 A few showers Max: 24°C |
Friday
 Chance of showers Max: 25°C |
Saturday
 A mix of sun and cloud Max: 25°C |
Sunday
 Sunny Max: 27°C |
Monday
A mix of sun and cloud Max: 29°C |
Tuesday
 Chance of showers Max: 25°C |
Wednesday
A mix of sun and cloud Max: 24°C |
Tonight
 Showers Min: 20°C |
Friday Night
 Cloudy periods Min: 18°C |
Saturday Night
Cloudy periods Min: 15°C |
Sunday Night
 Clear Min: 18°C |
Monday Night
Cloudy periods Min: 20°C |
Tuesday Night
 Chance of showers Min: 18°C |
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Forecast
Markham, ON (Issued: 11:00 AM EDT Thursday 17 August 2017)
- Thursday
- Mainly cloudy. A few showers beginning this afternoon. Risk of a thunderstorm late this afternoon. Wind becoming southeast 20 km/h this afternoon. High 24. Humidex 27. UV index 7 or high.
- Thursday night
- Showers ending before morning then partly cloudy. Risk of a thunderstorm this evening. Wind southeast 20 km/h becoming light near midnight. Low 20.
- Friday
- Mainly cloudy. 30 percent chance of showers in the afternoon. Wind becoming southwest 20 km/h gusting to 40 in the morning. High 25. Humidex 32.
- Friday night
- Cloudy periods. Low 18.
- Saturday
- A mix of sun and cloud. High 25.
- Saturday night
- Cloudy periods. Low 15.
- Sunday
- Sunny. High 27.
- Sunday night
- Clear. Low 18.
- Monday
- A mix of sun and cloud. High 29.
- Monday night
- Cloudy periods. Low 20.
- Tuesday
- A mix of sun and cloud with 40 percent chance of showers. High 25.
- Tuesday night
- Cloudy with 60 percent chance of showers. Low 18.
- Wednesday
- A mix of sun and cloud. High 24.