Yes, wildfires are possible in equatorial forests. The largest equatorial rainforests “are in the Amazon River Basin (South America), the Congo River Basin (western Africa), and throughout much of southeast Asia. Smaller rainforests are located in Central America, Madagascar, Australia and nearby islands, India, and other locations in the tropics.” “In 1997 and 1998, millions of hectares of forest around the world caught fire during an intense El Niño-related drought.
The fires were so widespread and intense that even ecosystems that do not usually burn were badly damaged, such as the Amazon rain forest in Brazil, the cloud forest of Chiapas in Mexico, and the rainforests of Borneo”.