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Strasbourg-and-Colmar-forum threads on August weather describe genuinely wide swings day to day - posters report highs anywhere from the mid-20s to occasional heatwave spikes well past 30C, mostly sunny in between. More than one traveler singles out Colmar and the Route du Vin as the favorite stop of an entire France trip, charm that holds regardless of the exact temperature that day. The practical advice splits accordingly: breathable cotton and a light layer for over-air-conditioned interiors, plus real waterproof gear and an umbrella rather than hoping the showers stay away. The record: 26C days feeling like 27C, 16.9C nights, 99mm of precipitation across 12.8 days, 68 percent humidity and 11 hours of sun - warm, genuinely wet at times, with real day-to-day variation baked in.

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.