The India Meteorological Department on Thursday forecast heavy rainfall for Mumbai over the next 48 hours. Meanwhile, the monsoon arrived in Delhi on Thursday, a day before its predicted date.

“Heavy rainfall is very likely at isolated places in the districts of Greater Mumbai, Thane, Palghar and Raigad today and tomorrow [Thursday and Friday],” the Met department said in a statement.

The weather department recorded 1.2 mm rainfall in South Mumbai and 7 mm in the suburbs. “Weather systems are fluctuating along the Arabian sea, leading to light to moderate rain,” IMD Deputy Director General (western region) KS Hosalikar told the Hindustan Times. “Similar rainfall activity is expected in the coming days.”

Additional Director General Mritunjay Mohapatra said the monsoon would cover the remainder of the country in the next two to three days. The monsoon usually reaches Delhi by June 29. The southwest monsoon this year hit Kerala on May 28, three days ahead of its regular date.