"Very less probability" of deficient monsoon, IMD director DG K G Ramesh was quoted as saying by PTI.
Rainfall is likely to be normal during the June-to-September south-west monsoon season, the government's weather office said on Monday.
The date of onset of monsoon will be announced in the middle of May.
Monsoon is considered as "normal" if the average rainfall is between 96-104 per cent of the LPA.
The forecaster also said that there is nil possibility of a big nationwide drought or deficient rainfall when the total cumulative seasonal rainfall across the country falls below 90 per cent of LPA.More news: Man City takes EPL title as Man United crash to West Brom
Private weather forecasting agency Skymet has said rainfall in 2018 will be normal at 100 per cent of the LPA.
IMD's SEFS model for the April forecast uses the following 5 predictors that require data upto March.
The four-month monsoon season provides about 70 per cent of the country's annual rainfall.
However, a clearer picture of the season, which normally extends from June 1 to September 30, would only be available in June, IMD said. He expressed hope that the Monsoon will be constant and not sporadic. India receives 89 cm of rainfall during the four-month monsoon season, which is nearly 75 per cent of its annual rainfall.
Despite "normal" forecast, the monsoon can be affected by the El Niño conditions.