There is only one long-term GHCN station in the interior of Africa. It is located at Zinder, Niger. The record heatwave there was 123 consecutive days over 100F from March 7 to July 7, 1922 – peaking at 121F on April 22. Average maximum temperature during that stretch was 113F.
BOM used to have this web page up showing the world record heatwave of 1923-1924 at Marble Bar, West Australia.