April and May
Go nowJust after the rains, before the crowds
The best window of the year. The wet season has ended, the countryside around the city is still green from it, the air is clear and the volcanoes are visible all day. This is before the July and August peak, so the canyon is quieter and prices are lower. Nights are cool but not yet cold.
September, October and November
Go nowDry, warm days and the peak season gone
The other good window, and the warmer of the two: clear dry days, mild nights, and the high-season crowds gone home. Rain becomes a possibility again towards the end of November, arriving as afternoon cloud. If you want the canyon without the tour-bus convoy, this is the stretch to pick.
June, July and August
Worth it, butThe clearest skies, the coldest nights, the most people
The driest and most reliable months, and therefore Peru's high season: full hotels, full buses to Colca, and higher prices everywhere. The trade-off is temperature rather than rain — nights are cold and the canyon viewpoints at dawn are genuinely freezing, which surprises people who packed for a tropical country. Book the canyon in advance in these months.
December
Worth it, butThe rains starting, and the holidays with them
The wet season is beginning: mornings are usually clear and clouds build in the afternoon, so plan sightseeing early. The Christmas and New Year period fills hotels with domestic travellers and prices rise for a couple of weeks around it. Between those weeks, December is quiet and reasonable.
March
Worth it, butThe rains ending, the landscape at its greenest
The tail of the wet season, and the countryside is at its best-looking of the year. Afternoon rain is still likely and mountain roads can be affected, so keep the canyon plan flexible. Late March is close to April in quality and cheaper, which makes it a decent gamble.
January and February
Think twiceThe wet months, and the volcanoes hidden
The core of the rainy season: cloud builds every afternoon, the volcanoes are often invisible for days, and roads to the Colca canyon are at their most likely to be disrupted by rain and landslides. It is also the part of the year when river prawn fishing is restricted, so the city's most famous soup may not be on. Cheap and green, and the wrong time for the canyon.