Potosí weather in September

Forum posters place September within Bolivia's dry season (roughly May-September) and its spring shoulder (September-November) - genuinely one of the better windows, with plenty of sunshine and very little rain across the Altiplano and salt flats. The clear tradeoff, though, is night cold: even with excellent, continuously clear daytime skies, nighttime temperatures on the high plain drop sharply, and posters say a proper sleeping bag or well-insulated accommodation is essential rather than optional. One seasonal caveat specific to this time of year: farmers burning cleared land in August-September can create haze that dulls the views on some days.

Forum posters describe Bolivia's rainy season as running roughly late December through March, with March still solidly within it though conditions improve noticeably as April approaches. Posters specifically discussing the Altiplano, where Potosí sits, note rain here usually isn't a major problem for city-based travel, though it's still wise to build in a few spare days for potential delays. Posters describe the typical pattern as heavy afternoon rain for a few hours rather than an all-day event, with rains generally easing toward the end of March. Posters do caution that March isn't ideal for trekking or mountain excursions specifically, since peaks are often shrouded in cloud this time of year. Posters generally rate March as still rainy but genuinely improving for Potosí, city sightseeing more reliable than mountain-based activities.