Quebec City weather in September

Regulars put the turn on about the 15th: after that it cools markedly and the nights, they say, head towards freezing - our monthly low averages 10.6C, so that is the end of the month rather than its middle - and the cooling is precisely what starts the colour. The leaves run from the third week of September into the second week of October, with the first week of October usually the best, so mid-September is early for anyone coming to see them. Dress autumnal - jeans and a light sweater or jacket - and expect to still eat outdoors, though by October the terraces have heaters and blankets. This is shoulder season: prices lower, streets uncrowded. Our row gives 20.9C days over 10.6C nights and 96.4mm across 9.6 days. The record: humidity 77 percent, 8.8 hours of sun and AQI 41.

Regulars describe a real split within the month - early on, the ground itself is still cold from winter, with only a week or two typically passed since the last snow, while the back half genuinely warms up and settles. Our row backs that mild-overall read sitting between those halves, 17.9C over 6.9C nights feeling 4C, with 86.3mm of rain across 12.1 days and a trace of very late snow, 0.7cm, matching regulars' accounts of a light snowfall on record even in mid-May some years. Regulars are consistent the standard packing list for early in the month runs surprisingly heavy - windbreaker, umbrella, gloves, hat and scarf - even though the same trip two weeks later might need none of it. The record: humidity 66 percent, 10 hours of sun, a 16.7 kph wind and AQI 41.

Regulars are direct that this month can turn genuinely hot and humid by day, cooling off much more at night, and specifically recommend booking accommodation with air conditioning rather than assuming a northern city won't need it. Our row backs the summer heat, 26.2C reading as a real 27C, over 15.9C nights, with a substantial 119.9mm of rain across 12.1 days. A recent trip report from regulars describes the month as genuinely variable within itself - a couple of glorious, mostly blue-sky days alongside a more intermittent, rain-prone stretch - rather than one settled pattern holding the whole visit. The record: humidity 76 percent, 11.5 hours of sun, a 15.3 kph wind and AQI 53.

August in Quebec City is more moderate and less humid than July, and regulars draw the comparison with Montreal deliberately: the city does not get the thermal inversion that makes Montreal muggy, so the season feels closer to normal here even when a heat wave arrives. Our row gives 24.9C days over 14.9C nights at 77 percent humidity. The calendar matters as much as the weather. The Festival d'Ete runs in July, so August is the quieter festival month - the fireworks finish on the second weekend and the film festival starts on the last - and the second half of August is one of the two sweet spots they name for summer weather with thinner crowds. The record: 12.8 precipitation days carrying 128.7mm and 10.4 hours of sun.

Quebec City forum threads describe January as genuinely cold, with typical highs and lows cited around -5 to -13C, though posters noted a historical extreme as low as -31C shows just how far the range can stretch. Wind chill was flagged as often the bigger factor than the raw temperature, with posters consistent that a windy -10C day can feel considerably worse than a still one at the same reading. Real snow was called highly likely, with posters noting the city typically sees snow by Christmas and conditions build from there through January. On the upside, posters specifically recommended late January for the start of Quebec's Winter Carnival, a genuine highlight with family-friendly activities built around embracing the cold rather than avoiding it. The consistent packing advice was proper base layers, a mid-weight insulating layer, and a windproof or insulated outer shell, plus a hat, scarf, gloves and real winter boots.