Montreal to close out August with sunshine before cooler, cloudier weather
Posted August 31, 2026 7:27 am.
Montreal is set to wrap up the month of August with mainly sunny skies Monday, but the start of September will bring cooler temperatures, increasing cloud cover and a chance of showers later in the week.
The final day of August will reach a high of 25 Celsius, with a humidex making it feel closer to 28. Fog patches are expected in the suburbs early Monday morning, while the UV index will reach 6, or high.
Clouds will increase late Monday evening, with an overnight low of 16 C.
September will begin Tuesday with mainly cloudy skies and a high of 22 C. Winds are expected to become northeast at 20 km/h around noon, while the humidex could make it feel like 25.
The overnight forecast calls for cloudy skies and a low of 18 C.
Wednesday will remain cloudy, with a high of 22 C. Showers are expected Wednesday night, continuing into Thursday, when the temperature will reach 23 C.
The unsettled weather is expected to ease Friday, with a mix of sun and cloud and a high of 22 C.
The weekend is shaping up to be somewhat brighter. Saturday is expected to bring a mix of sun and cloud with a high of 24 C, followed by a low of 13 C overnight. Sunday will see similar conditions, with a high of 24 C.
For Montreal, August will end on a warm and sunny note before a cooler and more unsettled start to September.
