Peru has two distinctive seasons
If you are seriously considering Peru as your next travel destination, you should be aware that you must consider travel seasons. In general, there are two distinct seasons in Peru: wet and dry. The dry season, which lasts roughly from May to September (or mid-October), is extremely popular with tourists, so it is often necessary to book accommodation or trips in advance. On the other hand, you'll be rewarded with almost perfect weather - blue skies and it also rarely rains, which is great, especially if you have only limited time for your Peru trip. It is important to remember that the dry season coincides with Peruvian winter, so temperatures are lower, especially in the mountains.
The wet season lasts from October to April, and as the name implies, there will be rain - the rainiest months are December, January, and February. If you want to hike, February is probably the worst month to visit Peru because the Inca Trail is closed for maintenance and other trails are prone to landslides. However, there are advantages to the rainy season. There are fewer visitors, prices are lower, temperatures are higher (it is summer), and it does not rain all of the time.