weather in quebec city in september
Weather in September in Quebec City, Quebec. 43.7Â°. The average temperature in Quebec City, Quebec in September is quite mild at 12.5 Â°C (54.5 Â°F). Afternoons can be very mild with average high temperatures reaching 17.9 Â°C (64.2 Â°F). Overnight temperatures are generally a little cool with an average low of 7.1 Â°C (44.8 Â°F).