Economy Mumbai monsoon: Heavy to very heavy rain prediction at few places today Updated : July 29, 2019 08:32 AM IST An official of the Mumbai regional centre, IMD, said the variation in rainfall would be in intensity Heavy rainfall is categorised as more than 64.5 mm rains in 24 hours. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.