Osh weather in September

One traveler who spent a month touring Kyrgyzstan from mid-August to mid-September, including stops in Osh itself, specifically noted Osh gets quite hot - distinct from the much colder, more unpredictable conditions posters describe for the high-altitude trekking routes elsewhere in the country (Son-Kul, Sary-Mogul), where snow is a real possibility even in September and temperatures can swing from shorts-and-t-shirt one day to bundled up the next. For the city itself, rather than the mountain routes, day-to-day conditions in September are generally described as warm and stable.

Kyrgyzstan's forum consistently flags Osh, in the south, as noticeably warmer than the mountainous north at the same time of year - one comparison cited a max daily temp roughly 8C higher in Osh than in Karakol during the shoulder season. Posters describe March itself as still early in the travel season, with roads generally passable but weather that can swing from a mild, sunny afternoon to a raw, wet or even snowy day without much warning. It's a transitional month rather than a settled one, so flexible plans and warm layers matter more than a fixed itinerary.