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Vienna's forum calls September the calm after summer — the heat has broken, sun is still likely on most days, and the standard advice is a light jacket for the odd rainy day rather than anything heavier. Year-to-year swings are real, though: some Septembers run 25°C, others barely reach 10°C.

Forum posters describe December across the Czech Republic as capable of real cold but generally mild enough winter overall that it wouldn't stop hours of walking, with heavy snow before Christmas described as unusual though genuinely possible. Posters consistently recommend layers, a proper coat, scarf, hat and gloves, plus good walking shoes, while noting snow boots or a heavy parka usually aren't necessary. Posters specifically flag Brno's Christmas markets as starting around November 22-23rd and highlight the city's past recognition as European Capital of Christmas, with markets that stay noticeably less crowded than the bigger, more famous ones in Vienna or Prague. Posters generally rate December as a genuinely good, atmospheric time to visit Brno, cold weather included.

Forum posters describe early June as likely warm with a real chance of at least some rainy days, and June through September broadly as a stretch where rain and grey overcast skies show up more often than visitors expect - highs in the 30sC aren't unusual by height of summer, with evening storms rolling through every few days. The clear upside posters raise for June specifically: it beats the bigger July-August crowds while still bringing decent warmth. For families, Brno gets called out as especially kid-friendly, with the Villa Tugendhat, the ossuary and the Brno Zoo named as reliable options regardless of what the sky does that day.