The rainfall was concentrated mainly over south Mumbai and parts of the western suburbs during the early morning hours.MUMBAI: Rain lashed parts of Mumbai on Monday morning, bringing relief from humid conditions and drenching several areas after weeks of a largely dry spell.Between 6am and 7am, the island city received an average rainfall of 17 mm, while the western suburbs recorded 10 mm.Bandra West recorded the highest rainfall at 70 mm. In south Mumbai, Worli Naka received 61 mm of rain, followed by Lower Parel at 58 mm. Other areas that witnessed significant rainfall included Malabar Hill (44 mm) and Worli (42 mm).The rainfall was concentrated mainly over south Mumbai and parts of the western suburbs during the early morning hours.Visuals from Bandra East and the Eastern Express Highway showed rain lashing parts of the city under overcast skies. Mumbai and adjoining areas also witnessed thunderstorms, lightning and gusty winds.The India Meteorological Department (IMD) has forecast thunderstorms, lightning, rain and gusty winds (30-50kmph) at isolated places in Mumbai over the next three days.The monsoon is expected to advance over Mumbai shortly, with the IMD set to make an official announcement once all the required parameters for onset are met.