Temperatures range from 10°C in the mornings to an agreeable 28°C during the afternoons. This may be slightly cooler in the Okavango Delta due to the plentiful water supplies bringing temperatures down.
One of the most striking birds in Botswana, the crimson-breasted shrike, can be spotted across the country but is commonly seen in the Makgadikgadi Pans and Central Kalahari regions. These can be difficult to access during the rainy season but the ground should have dried up enough by May for you to have full access to these great birding areas.
If you are looking to combine your Botswana safari with a trip to the magnificent Victoria Falls, May is the best time to visit due to the high water levels making the thunder of the falls even more significant.