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Regulars are specific this technically counts as the wettest month of the year here, an umbrella genuinely worth carrying, though rain tends to arrive as afternoon thunderstorms that clear quickly rather than a settled grey day. Our row backs that mild, genuinely wet read, 21.2C over 9.9C nights, with 77.5mm of rain across 10.5 days and humidity at 70 percent. Regulars are consistent this remains genuinely excellent walking weather overall, storks visibly migrating back to the region as a real seasonal marker, with noticeably fewer crowds and shorter museum lines than deep summer. This counts among the better months to pair with Alsace day trips before the peak-season rush arrives. The record: 10.9 hours of sun, a 13.4 kph wind and AQI 46.

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.

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.