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Wroclaw forum regulars rate September highly, especially the first half: one trip report from early September describes “excellent weather with perfect temperatures” and the city “looking stunning in sunshine,” with a specific day hitting 25°C. The broader read holds through much of the month — “perfectly good...until mid-October, with little rain, dry air, and pleasant nights.” One timing note worth knowing: the Japanese Garden and the university's Botanical Garden, two of the city's best-regarded attractions, are open only April through October, so September beats the shoulder months either side of that window. Our record: 20.2°C days, 11.9°C nights, 8.6 rain days and 8.6 hours of sun — mild and reasonably dry, consistent with the “perfectly good” read, if a touch cooler than the specific 25°C day one visitor caught.

Forum posters describe January in Poland, Poznań included, as likely snowy and cold, though posters are direct this isn't guaranteed - one recent year turned out surprisingly mild, with temperatures well above 0C across much of the country. Posters generally describe the range of possible January days as genuinely wide: it could be +10C with heavy rain, -10C with heavy snowfall, sunny, or foggy, all within the same month. Posters consistently recommend checking a reliable Polish weather site closer to travel dates rather than relying on generic seasonal averages, given how variable a specific January in Poznań can turn out. Posters generally recommend preparing for cold, potentially snowy conditions while accepting that the exact experience varies significantly year to year.

Forum posters put July generally around 20-25C and pleasant, though occasional heat waves can push things warmer, and posters flag July as one of Poland's rainier months compared to May or September - with the caveat that many buildings lack air conditioning, so a heat wave can feel worse than the number suggests. For the visit itself, Poznan's Old Market Square with the town hall is called an absolute must, complete with a daily noon show of two mechanical goats butting heads on the tower - and the Old Town is described as lively and safe well into the evening. Visitors timing a trip for late June will just miss the Malta International Theatre Festival, though summer concerts pick up the slack in July.