Wrocław (Wroclaw) weather in September

July is Wrocław's wettest month on paper and locals think that's misleading: "the average rainfall is still around 80mm, which is quite low." More useful is the shape of it — "usually when it even rains, it rains for say an hour and then you get a lot of sun to dry everything up," and it "often comes in the afternoon or evening if it comes at all." All-day rain is called very unusual, and "the situation where you really can't go anywhere at all and are forced to stay indoors is rare." The pattern regulars describe is streaky: a thunderstorm every afternoon for a stretch, or five wet days then five perfect ones. Expect 24–30°C. The dissent worth knowing is that some find peak July "unpleasantly hot and humid" near 35°C. Our record: 24.9°C days, 11.6 rain days.

June is the forum's pick for Wrocław: the summer programme is fully under way but the weather has not yet turned unpleasant, which July and August can — posters describe those months reaching 35°C and humid, and advise avoiding high summer here outright. June sits near 25°C by day and 15 overnight, with long daylight, usually sunny weather and flowers out. The caveat is the one Poland always gets: bring layers and a waterproof alongside the t-shirts, because "usually sunny" is not "reliably dry" — rain still lands on about ten days of the month.