Rwanda has two dry seasons and two rainy seasons. A first rainy season stretches from February to May and is followed by a dry season from June to August. Then, the rain starts again from September to December, whilst January is dry. The best period to visit Rwanda is therefore between June and August, as well as January.
I had a fabulous trip to Rwanda. I had no idea what to expect and I must say that I was impressed by how well organised and clean the country is. The main roads are in perfect condition. People are extremely welcoming and friendly.