Towards the end of the month, the rains do ease up, and in fact the end of May can be a great time to track the gorillas. With unpredictable weather, you can get some wonderful shots of the gorillas in the rain on one trek, and on another, have a nice and dry experience, for some totally different photos! This is something so great about this part of the world, especially in these transition periods between the wet and dry seasons.
With lower numbers of travellers, May can be a good choice for those who want to avoid any crowds elsewhere in the country. Although gorilla trek numbers are limited in Rwanda to just 8 people at a time. No matter when you travel, there will not be more people with the gorillas at one time.