weather in vancouver canada in september
September Weather in Vancouver is mild and comfortable.: Allan Fotheringham once called Vancouver the Canadian city with the best climate and the worst weather. September has the potential to show visitors great Vancouver weather -- mild and clear; however, dull and grey is another possibility. 1  Average September temperature: 14.4ÂºC / 58ÂºF. 2  September average high: 18.3ÂºC / 65ÂºF. 3  September average low: 10ÂºC / 50ÂºF. 4  September is not so rainy in a city famous for its rain.