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Stuttgart forum regulars, drawing on the wider Baden-Württemberg conversation, put July's average high around “25°C,” with days over 35°C called genuinely rare rather than typical — Stuttgart itself is flagged as “Germany's second warmest city,” so it runs hotter than the national norm even so. Afternoon or evening thunderstorms are a real possibility in peak summer, not too uncommon, but the baseline expectation is warm, sunny weather. One recent-year data point regulars cite as the exception rather than the rule: a late-July stretch of 30+°C during “an exceptional heatwave” across the whole southwest region. Standard advice stays constant regardless of season here: layers, plus a small collapsible umbrella. Our record: 25.2°C days, 15.1°C nights and 12.4 rain days — warm with real rain risk, matching the “warm and sunny, with real storm and heatwave exceptions” read.

Forum posters describe January in Stuttgart as cold and dark, with temperatures typically ranging from around -5C up to 10C, and posters consistently note conditions improve steadily from February through May. Posters flag a real elevation effect worth knowing: taking the U-15 up toward the TV tower area, roughly 200m higher than the valley floor, means noticeably colder temperatures and more frequent snow than down in the city center. Posters generally recommend indoor options for a January visit, highlighting the Wilhelma zoo and botanical garden as one of the city's best year-round attractions regardless of the cold. Posters generally rate January as a quiet, properly wintry time to visit Stuttgart, with the region's famous Christmas markets already wrapped up by the new year.