What should I wear to travel to Montreal, Canada in September?

The average temperature in Montreal in September is 7℃~ 19℃. The average temperature during the day is 19℃, so it is recommended to wear short clothes, T-shirts, thin jeans, casual clothes, professional clothes and other comfortable clothes. The average temperature at night is 7℃. It is recommended to wear trench coats, coats, jackets, sweaters, sweaters, suits, winter clothes and other warm clothes. The cities with the highest daily average temperature in Montreal in September are Edmonton (17℃), Banff (16℃), Baima City (12℃) and Prairie City (16℃). The cities with the lowest daily average temperature in Montreal in September are Edmonton (3℃), Banff (3℃), Baima (2℃) and Grassland (4℃).