Quebec City summers run from early June through mid September when temperatures can vary tremendously. Daytime temperatures can reach into the 90's with high humidity, especially in July and August. Lows in the 50's are rare but not unheard of. Budget travelers should book air - conditioned rooms during July and August, but beware that these may be the noisy window units - bring ear plugs, never a bad idea as street festivals can go on late.
Because there is always a possibility of rainstorms or more likely, summer showers, visitors should be prepared with an umbrella. Comfortable walking sandals and a light jacket for the evenings are recommended. Those with mobility problems may have difficulty walking the steep, cobblestone streets. Consider hiring a caleche (a horse drawn carriage) or take taxis.
Dress in Quebec City is best described as fashionable, but understated. While more casual than Montreal, the emphasis for both men and women is on clothing of good quality and cut especially for evening and business wear.
The business casual dress code is more acceptable here than in Montreal. Sun dresses, skirts, dress shorts and light weight pants are more comfortable than jeans for Quebec City summers. Baseball hats and track pants are a not such a sin here as in Montreal, possibly due to a higher density of tourists, especially in summer.