The climate in Ruhengeri is unpredictable although you can generally expect both sun as well as rainfall during the day. Ruhengeri is 1,700m above sea level. It is generally quite cold, particularly in the evening. Recommended clothing is long trousers and shirts when in the forest to avoid nettle stings. It is likely that you will get hot whilst walking though the forest and will cool down having reached the gorillas due to the high altitude, so you are advised to bring additional clothing.
Nights are quite cold, so a warm jumper is advisable for the evenings.
Wellington boots or hiking boots as well as waterproof raingear are essential when on a gorilla visit. You are strongly advised to bring a water bottle and a small snack although eating, drinking and smoking in the presence of the gorillas is forbidden. Porters are available to help you with transporting your baggage for a small charge. The altitude during gorilla visits may cause difficulties for some visitors, however pace yourself, drink plenty of water and make sure you eat well the day prior to your trip and eat a substantial breakfast. The authorities have made security of visitors among their highest priorities.