The 1978 North Indian Ocean cyclone season had no bounds, but tropical cyclones in the North Indian Ocean tend to form between April and December, with peaks in May and November.

The most notable storm of the season was Cyclone Four which hit Sri Lanka.

A depression formed in the northern Bay of Bengal on May 14 and move northward.

The storm reached its maximum intensity of 70 mph (115 km/h)[2] before making landfall in Eastern Bangladesh on May 17 and dissipating thereafter.

Another tropical depression formed in the Bay of Bengal on October 25 and moved northwestward.