Huchuy Qosqo Trek is in the Peruvian Andes, close to the popular Sacred Valley. So as in may of the trekking trails the weather conditions are similar to Cusco region, marked in two big seasons:
A dry season that runs from May through to November, and a wet season which starts in December and runs through to April. So the ideal time for a Huchuy Qosqo trek is during the dry season (May- November). However you can trek to Huchuy Qosqo all-year-round, but we suggest you avoiding January to March which are the main rainy months. The dry shoulder months of April and November are pleasant, although there is a higher probability of encountering rain.
Around Huchuy Qosqo temperatures are relatively consistent year-round. The days are warm (in the high 20s Celsius), at night and early mornings are cold (low digits and below zero Celsius in winter time). Layered trekking clothing is recommended.
Micro-climates dominate in the Andes, which means weather conditions can change quickly and rain is possible all year round. Do bring wet weather gear, like a poncho, even in the dry season.
Please note: May through September is the peak trekking season, however, as the Huchuy Qosqo trek is one of the least popular routes you are unlikely to encounter many trekkers on the trail. Machu Picchu, on the other hand, will be busy. You should try book your train tickets to Aguas Calientes and entrance tickets to the Citadel as soon as possible (note: these tickets are usually included in your tour package).