In Hyderabad, evening traffic was held up nearly everywhere, with water surging onto the roads from overflowing drains.
Chief Minister K Chandrasekhar Rao wanted the officials concerned to monitor tanks, lakes and rivulets, which are overflowing due to heavy rains.
A well-marked low-pressure area over south Chhattisgarh and south Odisha is causing the rains.
According to the India Meteorological Department (IMD), very heavy rainfall is likely on Monday, September 6, and it may intensify into extremely heavy rainfall on Tuesday.
Personnel from Malakpet traffic police station cleared the way for two ambulances that were stuck in a traffic jam caused by the heavy rain, by directing them to the adjacent lane.
Many Telangana districts that had initially experienced dry weather conditions received heavy showers from mid-August till end of the month.
On Sunday, several parts of the State, including Nalgonda, Vikarabad, Siddipet, Suryapet and Nizamabad, recorded moderate rains.
There is a possibility of light to moderate rain or thundershowers at isolated places in Telangana this week.