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Colmar-forum threads on December weather describe the Alsace region as cold and genuinely windy this time of year, layers doing more work than any single heavy coat, though actual snow in town is called uncommon in early-to-mid December - a light dusting shows up roughly one year in three, with a better chance of real snow up on the surrounding Vosges mountain tops than down in the old town streets. The famous Christmas markets are the whole draw regardless of the chill, running late November through year's end, and regulars are specific about timing: weekday mornings and Sunday evenings in late November or early December bring thinner crowds than weekends or Christmas week itself. The half-timbered old town is called especially magical lit up for the holidays, cold enough for mulled wine breaks but not so cold it ruins the evening. The record: 6.8C days feeling like 4C, 1C nights, 82mm across 12.8 days, 7.7cm of fresh snowfall, 87 percent humidity and just 4 hours of sun.

Forum posters describe March in Switzerland as genuinely unpredictable, sometimes cold and wet, sometimes dry and sunny, with winter still firmly in charge at higher elevations. Posters describe late March around lower-elevation lake and plateau areas like Basel as trending toward spring, with daytime highs typically 12-18C and comfortable conditions, snow largely confined to the mountains by that point. Posters are direct that recent years have still brought occasional March snow even this late in the month, before flipping suddenly to warm, sunny stretches. Posters consistently recommend proper layers - a windproof, waterproof outer layer, plus a scarf and gloves for a cold snap - regardless of how promising the forecast looks. Posters generally rate late March as more reliably pleasant in Basel than early March.

Basel forum regulars call September one of the better months generally — warm days and coolish evenings, school holidays over so fewer tourists than July or August — but Basel specifically “can be between warm and hot...or cool if you would have a bad weather period,” genuine year-to-year variability rather than one reliable read. “Normally it is sunny and warm but not hot,” though one poster notes a recent September that “rained a lot” against that norm. For a river cruise or day trip specifically, layering is the standard advice — thin layers that trap heat and adjust easily, plus a waterproof/windproof shell and a warmer piece for any altitude add-on. Our record: 22.2°C days, 12.2°C nights, 10.2 rain days and 9.4 hours of sun — mild and reasonably sunny, matching the “warm but not hot, real year-to-year variation” read.